89 results on '"Guilhaumon F"'
Search Results
2. Rebuilding Mediterranean marine resources under climate change
- Author
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Moullec, F, Barrier, N., Guilhaumon, F., Peck, M.A., Ulses, C., Shin, Y.J., Moullec, F, Barrier, N., Guilhaumon, F., Peck, M.A., Ulses, C., and Shin, Y.J.
- Abstract
The Mediterranean Sea ranks among the most overexploited and fastest-warming ocean regions. This situation calls for urgent development of global change scenarios and models of marine biodiversity to anticipate changes and support ecosystem-based management strategies across the entire Mediterranean Sea. Using a new end-to-end modelling chain for the whole Mediterranean Sea, we explored the potential effects of changes in fishing pressure on marine resources and ecosystem structure and functioning under a worst-case climate change scenario (RCP8.5). We found that a decrease in fishing mortality or an improvement in fishing selectivity could increase the total biomass and total catch of high trophic level species by the middle and end of the 21st century, especially the biomass of demersal, large pelagic and benthic species, thereby reversing the projected climate-induced decrease in their biomass and catch by the end of the century in the western Mediterranean basin. In contrast, climate change could offer opportunities for some eastern Mediterranean fisheries to increase catches of thermophilic and/or exotic species benefiting from new favourable environmental conditions. Based on a suite of ecological indicators, our results indicated clear positive effects of a more sustainable fisheries management on ecosystem structure and functioning. However, a decrease in fishing pressure may not fully compensate for climate-induced changes on marine resources and ecosystems, but rather buffer some projected negative impacts. Our study highlights the need for a more sustainable exploitation of fisheries resources to restore marine ecosystems and increase their resilience in a global change context.
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- 2023
3. GeoAI for Marine Ecosystem Monitoring: a Complete Workflow to Generate Maps from AI Model Predictions
- Author
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Talpaert Daudon, J., Contini, M., Urbina-Barreto, I., Elliott, B., Guilhaumon, F., Joly, A., Bonhommeau, S., and Barde, J.
- Subjects
GeoAI ,marine ecology ,segmentation ,deep learning ,object detection ,photogrammetry ,computer vision ,geospatial - Abstract
Mapping and monitoring marine ecosystems imply several challenges for data collection and processing: water depth, restricted access to locations, instrumentation costs or weather constraints for sampling, among others. Nowadays, Artificial Intelligence (AI) and Geographic Information System (GIS) open source software can be combined in new kinds of workflows, to annotate and predict objects directly on georeferenced raster data (e.g. orthomosaics). Here, we describe and share the code of a generic method to train a deep learning model with spatial annotations and use it to directly generate model predictions as spatial features. This workflow has been tested and validated in three use cases related to marine ecosystem monitoring at different geographic scales: (i) segmentation of corals on orthomosaics made of underwater images to automate coral reef habitats mapping, (ii) detection and classification of fishing vessels on remote sensing satellite imagery to estimate a proxy of fishing effort (iii) segmentation of marine species and habitats on underwater images with a simple geolocation. Models have been successfully trained and the models predictions are displayed with maps in the three use cases.
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- 2023
4. Rebuilding Mediterranean marine resources under climate change
- Author
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Moullec, F, primary, Barrier, N, additional, Guilhaumon, F, additional, Peck, MA, additional, Ulses, C, additional, and Shin, YJ, additional
- Published
- 2023
- Full Text
- View/download PDF
5. Global tropical reef fish richness could decline by around half if corals are lost
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Strona, G, Lafferty, K, Fattorini, S, Beck, P, Guilhaumon, F, Arrigoni, R, Montano, S, Seveso, D, Galli, P, Planes, S, Parravicini, V, Strona G., Lafferty K. D., Fattorini S., Beck P. S. A., Guilhaumon F., Arrigoni R., Montano S., Seveso D., Galli P., Planes S., Parravicini V., Strona, G, Lafferty, K, Fattorini, S, Beck, P, Guilhaumon, F, Arrigoni, R, Montano, S, Seveso, D, Galli, P, Planes, S, Parravicini, V, Strona G., Lafferty K. D., Fattorini S., Beck P. S. A., Guilhaumon F., Arrigoni R., Montano S., Seveso D., Galli P., Planes S., and Parravicini V.
- Abstract
Reef fishes are a treasured part of marine biodiversity, and also provide needed protein for many millions of people. Although most reef fishes might survive projected increases in ocean temperatures, corals are less tolerant. A few fish species strictly depend on corals for food and shelter, suggesting that coral extinctions could lead to some secondary fish extinctions. However, secondary extinctions could extend far beyond those few coral-dependent species. Furthermore, it is yet unknown how such fish declines might vary around the world. Current coral mass mortalities led us to ask how fish communities would respond to coral loss within and across oceans. We mapped 6964 coral-reef-fish species and 119 coral genera, and then regressed reef-fish species richness against coral generic richness at the 1° scale (after controlling for biogeographic factors that drive species diversification). Consistent with small-scale studies, statistical extrapolations suggested that local fish richness across the globe would be around half its current value in a hypothetical world without coral, leading to more areas with low or intermediate fish species richness and fewer fish diversity hotspots.
- Published
- 2021
6. Ecological dependencies make remote reef fish communities most vulnerable to coral loss
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Strona, G, Beck, P, Cabeza, M, Fattorini, S, Guilhaumon, F, Micheli, F, Montano, S, Ovaskainen, O, Planes, S, Veech, J, Parravicini, V, Strona G., Beck P. S. A., Cabeza M., Fattorini S., Guilhaumon F., Micheli F., Montano S., Ovaskainen O., Planes S., Veech J. A., Parravicini V., Strona, G, Beck, P, Cabeza, M, Fattorini, S, Guilhaumon, F, Micheli, F, Montano, S, Ovaskainen, O, Planes, S, Veech, J, Parravicini, V, Strona G., Beck P. S. A., Cabeza M., Fattorini S., Guilhaumon F., Micheli F., Montano S., Ovaskainen O., Planes S., Veech J. A., and Parravicini V.
- Abstract
Ecosystems face both local hazards, such as over-exploitation, and global hazards, such as climate change. Since the impact of local hazards attenuates with distance from humans, local extinction risk should decrease with remoteness, making faraway areas safe havens for biodiversity. However, isolation and reduced anthropogenic disturbance may increase ecological specialization in remote communities, and hence their vulnerability to secondary effects of diversity loss propagating through networks of interacting species. We show this to be true for reef fish communities across the globe. An increase in fish-coral dependency with the distance of coral reefs from human settlements, paired with the far-reaching impacts of global hazards, increases the risk of fish species loss, counteracting the benefits of remoteness. Hotspots of fish risk from fish-coral dependency are distinct from those caused by direct human impacts, increasing the number of risk hotspots by ~30% globally. These findings might apply to other ecosystems on Earth and depict a world where no place, no matter how remote, is safe for biodiversity, calling for a reconsideration of global conservation priorities.
- Published
- 2021
7. Using species distribution models only may underestimate climate change impacts on future marine biodiversity
- Author
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Moullec, F, Barrier, N., Drira, S., Guilhaumon, F., Hattab, T., Peck, M.A., Shin, Y.-J., Moullec, F, Barrier, N., Drira, S., Guilhaumon, F., Hattab, T., Peck, M.A., and Shin, Y.-J.
- Abstract
In face of global changes, projecting and mapping biodiversity changes are of critical importance to support management and conservation measures of marine ecosystems. Despite the development of a wide variety of ecosystem models capable of integrating an increasing number of ecological processes, most projections of climate-induced changes in marine biodiversity are based on species distribution models (SDMs). These correlative models present a significant advantage when the lack of knowledge on the species physiology is counterbalanced by the availability of relevant environmental variables over the species geographical range. However, correlative SDMs neglect intra- and inter-specific interactions and thereby can lead to biased projections of changes in biodiversity distribution. To evaluate the influence of trophic interactions on projections of species richness and assemblage composition under climate change scenarios, we compared biodiversity projections derived from an ensemble of different SDMs to projections derived from a hybrid model coupling SDMs and a multispecies trophic model in the Mediterranean Sea. Our results show that accounting for trophic interactions modifies projections of future biodiversity in the Mediterranean Sea. Under the RCP8.5 scenario, SDMs tended to overestimate the gains and underestimate the losses of species richness by the end of the 21st century, with marked local differences in projections, both in terms of magnitude and trend, in some biodiversity hotspots. In both SDMs and hybrid approaches, nestedness with gains in species richness was the main pattern driving dissimilarity between present and future fish and macro-invertebrate species assemblages at the Mediterranean basin scale. However, at local scale, we highlighted some differences in the relative contribution of nestedness vs replacement in driving dissimilarity. Our results call for the development of integrated modelling tools that can mechanistically consider multi
- Published
- 2022
8. Predicting trophic guild and diet overlap from functional traits : statistics, opportunities and limitations for marine ecology
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Albouy, C., Guilhaumon, F., Villéger, S., Mouchet, M., Mercier, L., Culioli, J. M., Tomasini, J. A., Le Loc’h, F., and Mouillot, D.
- Published
- 2011
9. Ecological correlates of dispersal success of Lessepsian fishes
- Author
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Lasram, F. Ben Rais, Tomasini, J. A., Guilhaumon, F., Romdhane, M. S., Chi, T. Do, and Mouillot, D.
- Published
- 2008
10. Effects of the environment on fish juvenile growth in West African stressful estuaries
- Author
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Diouf, K., Guilhaumon, F., Aliaume, C., Ndiaye, P., Chi, T. Do, and Panfili, J.
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- 2009
- Full Text
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11. Temperature effects on Calanus helgolandicus (Copepoda: Calanoida) development time and egg production
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Bonnet, D., Harris, R. P., Yebra, L., Guilhaumon, F., Conway, D. V. P., and Hirst, A. G.
- Published
- 2009
12. sars: an R package for fitting, evaluating and comparing species–area relationship models
- Author
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Matthews, T.J. Triantis, K.A. Whittaker, R.J. Guilhaumon, F.
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body regions ,fungi ,skin and connective tissue diseases - Abstract
The species–area relationship (SAR) constitutes one of the most general ecological patterns globally. A number of different SAR models have been proposed. Recent work has shown that no single model universally provides the best fit to empirical SAR datasets: multiple models may be of practical and theoretical interest. However, there are no software packages available that a) allow users to fit the full range of published SAR models, or b) provide functions to undertake a range of additional SAR-related analyses. To address these needs, we have developed the R package ‘sars’ that provides a wide variety of SAR-related functionality. The package provides functions to: a) fit 20 SAR models using non-linear and linear regression, b) calculate multi-model averaged curves using various information criteria, and c) generate confidence intervals using bootstrapping. Plotting functions allow users to depict and scrutinize the fits of individual models and multi-model averaged curves. The package also provides additional SAR functionality, including functions to fit, plot and evaluate the random placement model using a species–sites abundance matrix, and to fit the general dynamic model of oceanic island biogeography. The ‘sars’ R package will aid future SAR research by providing a comprehensive set of simple to use tools that enable in-depth exploration of SARs and SAR-related patterns. The package has been designed to allow other researchers to add new functions and models in the future and thus the package represents a resource for future SAR work that can be built on and expanded by workers in the field. © 2019 The Authors. Ecography © 2019 Nordic Society Oikos
- Published
- 2019
13. Phytoplankton strategies to exploit nutrients in coastal lagoons with different eutrophication status during re-oligotrophication
- Author
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Leruste, A, Guilhaumon, F, De Wit, R, Malet, Nathalie, Collos, Y, Bec, Beatrice, Leruste, A, Guilhaumon, F, De Wit, R, Malet, Nathalie, Collos, Y, and Bec, Beatrice
- Abstract
We studied a mesotrophic and a hypertrophic Mediterranean coastal lagoon, both of which had been simultaneously subjected to a nutrient input reduction for 9 yr. We compared these 2 lagoons to an oligotrophic coastal lagoon. Using bioassays comprising 24 h incubations with added phosphorus and/or ammonium, we investigated the response of the phytoplankton communities to nutrient enrichment during summer in terms of biomass, size class structure, abundance and growth. For nitrogen and phosphorus, we identified which nutrient limited phytoplankton growth, and what strategies of nutrient exploitation the communities adopted to cope with these limitations. Ultraphytoplankton dominated the 3 communities, but it differed in composition among the lagoons. Green algae dominated in the hypertrophic lagoon, whereas the mesotrophic lagoon presented a higher diversity of phytoplankton groups. Picocyanobacteria and small diatoms were the most abundant groups in the oligotrophic lagoon, although they accounted for less biomass than green algae. The communities of the mesotrophic and the hypertrophic lagoons strongly responded to the nutrient pulse, showing that the re-oligotrophication trajectories of these lagoons were still very vulnerable to occasional eutrophication events. On the other hand, the oligotrophic lagoon marginally responded to the enrichment, indicating its adaptation to nutrient-depleted conditions. We observed a shift along the eutrophication gradient, from a co-limitation by N and P in the oligotrophic and the mesotrophic lagoons to a single and strong N limitation in the hypertrophic lagoon. Each community demonstrated specific use of internal, external or recycled nutrient pools under experimentally induced limitation.
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- 2019
- Full Text
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14. Phytoplankton strategies to exploit nutrients in coastal lagoons with different eutrophication status during re-oligotrophication
- Author
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Leruste, A, primary, Guilhaumon, F, additional, De Wit, R, additional, Malet, N, additional, Collos, Y, additional, and Bec, B, additional
- Published
- 2019
- Full Text
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15. Comparing functional and phylogenetic diversity of copepod communities in the Mediterranean Sea
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Terbıyık Kurt, Tuba, Ayata, Sakina-Dorothée, Benedetti, F., Blanco Bercial, L., Cornils, A., Guilhaumon, F., Çukurova Üniversitesi, Su Ürünleri Fakültesi, Su Ürünleri Temel Bilimleri Bölümü, and Terbıyık Kurt, Tuba
- Subjects
fungi ,respiratory system ,human activities - Abstract
The diversity of natural communities is classically estimated through species identification (taxonomic diversity) but can also be estimated from the ecological functions performed by the species (functional diversity), or from the phylogenetic relationships among them (phylogenetic diversity). Estimating functional diversity requires the definition of specific functional traits, i.e., phenotypic characteristics that impact fitness and are relevant to ecosystem functioning. Estimating phylogenetic diversity requires the description of phylogenetic relationships, for instance by using molecular tools. In the present study, we computed the functional and the phylogenetic diversity of copepod surface communities in the Mediterranean Sea and compared these different biodiversity facets among ecoregions. Firstly, we implemented a specific trait database for the most commonly-sampled and abundant copepod species of the Mediterranean Sea. Our database includes 191 species, described by seven traits encompassing diverse ecological functions: minimal and maximal body length, trophic group, feeding type, spawning strategy, diel vertical migration and vertical habitat. Clustering analysis in the functional trait space revealed that Mediterranean copepods can be gathered into groups that have different ecological roles. Secondly, we reconstructed a phylogenetic tree using the available sequences of 18S rRNA. Our tree included 154 of the analyzed Mediterranean copepod species. Then, we used these two datasets to describe the functional and phylogenetic diversity of copepod surface communities in the Mediterranean Sea and compare them among ecoregions. The replacement component (turn-over) and the species richness difference component (nestedness) of the beta diversity indices were identified. Finally, by comparing various and complementary aspects of plankton diversity (taxonomic, functional, and phylogenetic diversity) we were able to gain a better understanding of the relationships among the zooplankton community, biodiversity, ecosystem function, and environmental forcing.
- Published
- 2017
16. Island species–area relationships and species–accumulation curves are not equivalent: an analysis of habitat island datasets
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Whittaker, RJ, Matthews, TJ, Trinantis, KA, Rigal, F, Borregaard, MK, and Guilhaumon, F
- Abstract
Aim The relationship between species number and area is of fundamental importance within macroecology and conservation science. Yet, the implications of different means of quantitative depiction of the relationship remain contentious. We set out (i) to establish the variation in form of the relationship between two distinct methods applied to the same habitat island datasets, (ii) to explore the relevance of several key dataset properties for variation in parameters of these relationships, and (iii) to assess implications for applications of the resulting models. Locations Global Methods Through literature search we compiled 97 habitat island datasets. For each we analysed the form of the island species–area relationship (ISAR) and several versions of species accumulation curve (SAC), giving priority to a randomized form (Ran-SAC). Having established the validity of the power model, we compared the slopes (z-values) between the ISAR and the SAC for each dataset. We used boosted regression tree and simulation analyses to investigate the effect of nestedness and other variables in driving observed differences in z values between ISARs and SACs. Results The Ran-SAC was steeper than the ISAR in 77% of datasets. The differences were primarily driven by the degree of nestedness, although other variables (e.g. number of islands in a dataset) were also important. The ISAR was often a poor predictor of archipelago species richness. Main conclusions Slopes of the ISAR and SAC for the same data set can vary substantially, revealing their non-equivalence, with implications for applications of species–area curve parameters in conservation science. For example, the ISAR was a poor predictor of archipelagic richness in datasets with a low degree of nestedness. Caution should be employed when using the ISAR for extrapolation and prediction purposes in habitat island systems.
- Published
- 2016
17. On the form of species–area relationships in habitat islands and true islands
- Author
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Matthews, T.J. Guilhaumon, F. Triantis, K.A. Borregaard, M.K. Whittaker, R.J.
- Abstract
Aim: We undertook the largest comparative study to date of the form of the island species–area relationship (ISAR) using 207 habitat island datasets and 601 true island datasets. We also undertook analyses of (a) the factors influencing z- and c-values of the power (log–log) model and (b) how z and c vary between different island types. Location: Global. Methods: We used an information theoretic approach to compare the fit of 20 ISAR models to 207 habitat island datasets. Model performance was ranked according to pre-set criteria, including metrics of generality and efficiency. We also fitted the power (log–log) model to each dataset and analysed variation in parameter estimates and model fits as a function of key dataset characteristics using linear models and constrained analysis of principal coordinates. Results: The power (nonlinear) model provided the best fit to the most datasets, and was the highest ranked model overall. In general, the more complex models performed badly. Average z-values were significantly lower for habitat island datasets than for true islands, and were higher for mountaintop and urban habitat islands than for other habitat island types. Average c-values were significantly lower for oceanic islands, and significantly higher for inland water-body islands, than for habitat islands. Values of z and c were related to dataset characteristics including the ratio of the largest to smallest island and the maximum and minimum richness values in a dataset. Main conclusions: Our multimodel comparisons demonstrated the nonlinear implementation of the power model to be the best overall model and thus to be a sensible choice for general use. As the z-value of the log–log power model varied in relation to ecological and geographical properties of the study systems, caution should be employed when using canonical values for applied purposes. © 2015 John Wiley & Sons Ltd
- Published
- 2016
18. Island species-area relationships and species accumulation curves are not equivalent: An analysis of habitat island datasets
- Author
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Matthews, T.J. Triantis, K.A. Rigal, F. Borregaard, M.K. Guilhaumon, F. Whittaker, R.J.
- Abstract
Aim: The relationship between species number and area is of fundamental importance in macroecology and conservation science, yet the implications of different means of quantitative depiction of the relationship remain contentious. We set out (1) to establish the variation in form of the relationship between two distinct methods applied to the same habitat island datasets, (2) to explore the relevance of several key dataset properties for variation in the parameters of these relationships, and (3) to assess the implications for application of the resulting models. Locations: Global. Methods: Through literature search we compiled 97 habitat island datasets. For each we analysed the form of the island species-area relationship (ISAR) and several versions of species accumulation curve (SAC), giving priority to a randomized form (Ran-SAC). Having established the validity of the power model, we compared the slopes (z-values) between the ISAR and the SAC for each dataset. We used boosted regression tree and simulation analyses to investigate the effect of nestedness and other variables in driving observed differences in z-values between ISARs and SACs. Results: The Ran-SAC was steeper than the ISAR in 77% of datasets. The differences were primarily driven by the degree of nestedness, although other variables (e.g. the number of islands in a dataset) were also important. The ISAR was often a poor predictor of archipelago species richness. Main conclusions: Slopes of the ISAR and SAC for the same data set can vary substantially, revealing their non-equivalence, with implications for applications of species-area curve parameters in conservation science. For example, the ISAR was a poor predictor of archipelagic richness in datasets with a low degree of nestedness. Caution should be employed when using the ISAR for the purposes of extrapolation and prediction in habitat island systems. © 2016 John Wiley & Sons Ltd.
- Published
- 2016
19. Diversity regulation at macro-scales: Species richness on oceanic archipelagos
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Triantis, K.A. Economo, E.P. Guilhaumon, F. Ricklefs, R.E.
- Subjects
geographic locations - Abstract
Aim: Understanding the mechanisms that generate diversity patterns requires analyses at spatial and temporal scales that are appropriate to the dispersal capacities and ecological requirements of organisms. Oceanic archipelagos provide a range of island sizes and configurations which should predictably influence colonization, diversification and extinction. To explore the influence of these factors on archipelagic diversity, we relate the numbers of native and endemic species of vascular plants, birds, land snails and spiders - taxa having different dispersal capabilities and population densities - to the number and sizes of islands in the major oceanic archipelagos of the globe. Location: Fourteen major oceanic archipelagos of the globe. Methods: Species richness was collated for native and endemic species in each archipelago. We used linear mixed effect models to quantify the influence on diversity of total area, number of islands, isolation and latitude. We then applied process-based modelling in a Bayesian framework to evaluate how speciation, colonization and extinction are influenced by characteristics of archipelagos associated with species richness, i.e. area, isolation and number of islands. Results: We found parallel scaling of species richness among taxa with respect to total area and number of islands across groups. The process-based model supported effects of isolation on colonization and of area and number of islands on extinction rates, with the scaling exponents mostly similar across taxa. Data are consistent with a range of scaling exponents for speciation rate, implying that those relationships are difficult to infer from the data used. Conclusions: We demonstrate an unexpected parallel scaling of species richness of four taxa with area and number of islands for the major oceanic archipelagos of the globe. We infer that this scaling arises through similar effects of the physical characteristics of archipelagos on extinction, colonization and speciation rates across these disparate taxa, indicating that similar mechanisms have created variation in diversity. © 2015 John Wiley & Sons Ltd.
- Published
- 2015
20. Global marine protected areas do not secure the evolutionary history of tropical corals and fishes
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Mouillot, D., Parravicini, V., Bellwood, D. R., Leprieur, F., Huang, D., Cowman, P. F., Albouy, Camille, Hughes, T. P., Thuiller, W., Guilhaumon, F., Mouillot, D., Parravicini, V., Bellwood, D. R., Leprieur, F., Huang, D., Cowman, P. F., Albouy, Camille, Hughes, T. P., Thuiller, W., and Guilhaumon, F.
- Abstract
Although coral reefs support the largest concentrations of marine biodiversity worldwide, the extent to which the global system of marine-protected areas (MPAs) represents individual species and the breadth of evolutionary history across the Tree of Life has never been quantified. Here we show that only 5.7% of scleractinian coral species and 21.7% of labrid fish species reach the minimum protection target of 10% of their geographic ranges within MPAs. We also estimate that the current global MPA system secures only 1.7% of the Tree of Life for corals, and 17.6% for fishes. Regionally, the Atlantic and Eastern Pacific show the greatest deficit of protection for corals while for fishes this deficit is located primarily in the Western Indian Ocean and in the Central Pacific. Our results call for a global coordinated expansion of current conservation efforts to fully secure the Tree of Life on coral reefs.
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- 2016
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21. Multifaceted diversity\u2013area relationships reveal global hotspots of mammalian species, trait and lineage diversity
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Mazel, F, Guilhaumon, F, Mouquet, N, Devictor, V, Gravel, D, Renaud, J, Cianciaruso, M.V, Loyola, R.D, Diniz-Filho, J.A.F, and Mouillot, D. & Thuiller, W
- Published
- 2014
22. Functional biogeography of oceanic islands and the scaling of functional diversity in the Azores
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Whittaker, R.J. Rigal, F. Borges, P.A.V. Cardoso, P. Terzopoulou, S. Casanoves, F. Pla, L. Guilhaumon, F. Ladle, R.J. Triantis, K.A.
- Abstract
Analyses of species-diversity patterns of remote islands have been crucial to the development of biogeographic theory, yet little is known about corresponding patterns in functional traits on islands and how, for example, they may be affected by the introduction of exotic species. We collated trait data for spiders and beetles and used a functional diversity index (FRic) to test for nonrandomness in the contribution of endemic, other native (also combined as indigenous), and exotic species to functional-trait space across the nine islands of the Azores. In general, for both taxa and for each distributional category, functional diversity increases with species richness, which, in turn scales with island area. Null simulations support the hypothesis that each distributional group contributes to functional diversity in proportion to their species richness. Exotic spiders have added novel trait space to a greater degree than have exotic beetles, likely indicating greater impact of the reduction of immigration filters and/or differential historical losses of indigenous species. Analyses of species occurring in native-forest remnants provide limited indications of the operation of habitat filtering of exotics for three islands, but only for beetles. Although the general linear (not saturating) pattern of trait-space increase with richness of exotics suggests an ongoing process of functional enrichment and accommodation, further work is urgently needed to determine how estimates of extinction debt of indigenous species should be adjusted in the light of these findings. © 2014 PNAS.
- Published
- 2014
23. Differences in species-area relationships among the major lineages of land plants: A macroecological perspective
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Patiño, J. Weigelt, P. Guilhaumon, F. Kreft, H. Triantis, K.A. Naranjo-Cigala, A. Sólymos, P. Vanderpoorten, A.
- Subjects
fungi - Abstract
Aim: Although the increase in species richness with increasing area is considered one of the few laws in ecology, the role of environmental and taxon-specific features in shaping species-area relationships (SARs) remains controversial. Using 421 land-plant floras covering continents, continental islands and oceanic islands, we investigate whether variations in SAR parameters can be interpreted in terms of differences among lineages in speciation mode and dispersal capacities (TAXON), or of geological history and geographical isolation between continents and islands (GEO). Location: Global. Methods: Linear mixed-effects models describing variation in SARs, depending on the factors GEO and TAXON and controlling for differences between realms (REALM) and biomes (BIOME). Results: The best random-effect structure included both random slopes and random intercepts for GEO, TAXON, REALM and BIOME. This accounted for 77% of the total variation in species richness, substantially more than the 27% statistically explained by the model with fixed effects only (i.e. the simple SAR). The slopes of the SARs were higher for oceanic islands than for continental islands and continents, and higher in spermatophytes than in pteridophytes and bryophytes. The intercepts largely exhibited the reverse trend. TAXON was included in best-fit models restricted to oceanic and continental islands, but not continents. Analysing each plant lineage separately, the intercept of GEO was only included in the random structure of spermatophytes. Main conclusions: SAR parameters varied considerably depending on geological history and taxon-specific traits. Such differences in SARs among land plants challenge the neutral theory that the accumulation of species richness on islands is controlled exclusively by extrinsic factors. Taxon-specific differences in SARs were, however, confounded by interactions with geological history and geographical isolation. This highlights the importance of applying integrative frameworks that take both environmental context and taxonomic idiosyncrasies into account in SAR analyses. © 2014 John Wiley & Sons Ltd.
- Published
- 2014
24. Global marine protected areas do not secure the evolutionary history of tropical corals and fishes
- Author
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Mouillot, D., primary, Parravicini, V., additional, Bellwood, D. R., additional, Leprieur, F., additional, Huang, D., additional, Cowman, P. F., additional, Albouy, C., additional, Hughes, T. P., additional, Thuiller, W., additional, and Guilhaumon, F., additional
- Published
- 2016
- Full Text
- View/download PDF
25. Slow growth of the overexploited milk sharkRhizoprionodon acutusaffects its sustainability in West Africa
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Ba, A., primary, Diouf, K., additional, Guilhaumon, F., additional, and Panfili, J., additional
- Published
- 2015
- Full Text
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26. How can quantitative ecology be attractive to young scientists? Balancing computer/desk work with fieldwork
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Gimenez, Olivier, Abadi, F., Barnagaud, Jean-Yves, Blanc, L., Buoro, M., Cubaynes, S., Desprez, M., Gamelon, Marlène, Guilhaumon, F., Lagrange, P., Madon, B., Marescot, L., Papadatou, Eleni, Papaix, Julien, Péron, G., Servanty, S., Centre d’Ecologie Fonctionnelle et Evolutive (CEFE), Université Paul-Valéry - Montpellier 3 (UPVM)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-École Pratique des Hautes Études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Biodiversité, Gènes & Communautés (BioGeCo), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB), Department of Environmental Science, Policy, and Management, University of California (UC), Department of Life Sciences, Imperial College London, Marine Mammal Research Group, Graduate School of Environment, Macquarie University, Laboratoire de Biométrie et Biologie Evolutive - UMR 5558 (LBBE), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS)-Centre National de la Recherche Scientifique (CNRS), CNERA Cervidés Sangliers, Office National de la Chasse et de la Faune Sauvage, 'Rui Nabeiro' Biodiversity Chair, Centro de Investigaçao em Biodiversidade e Recursos Genéticos, Département de biologie [Sherbrooke] (UdeS), Faculté des sciences [Sherbrooke] (UdeS), Université de Sherbrooke (UdeS)-Université de Sherbrooke (UdeS), Boomerang for Earth Conservation, D. Vernardou 14, BIOlogie et GEstion des Risques en agriculture (BIOGER), Institut National de la Recherche Agronomique (INRA)-AgroParisTech, Unité de recherche Mathématiques et Informatique Appliquées (MIA), Institut National de la Recherche Agronomique (INRA), Patuxent Wildlife Research Center, United States Geological Survey [Reston] (USGS), Colorado Cooperative Fish and Wildlife Research Unit, 1484 Campus Delivery, Colorado State University [Fort Collins] (CSU), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut National de la Recherche Agronomique (INRA)-Université Paul-Valéry - Montpellier 3 (UPVM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut de Recherche pour le Développement (IRD [France-Sud]), University of California, Institut de Recherche pour le Développement (IRD [France-Sud])-Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Paul-Valéry - Montpellier 3 (UM3), Biodiversité, Gènes et Communautés, Département de biologie, Université de Sherbrooke [Sherbrooke], AgroParisTech-Institut National de la Recherche Agronomique (INRA), and Université Paul-Valéry - Montpellier 3 (UM3)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-École pratique des hautes études (EPHE)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)
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[SDV.SA]Life Sciences [q-bio]/Agricultural sciences ,adaptive management ,conservation ,dynamics - Abstract
absent
- Published
- 2013
27. Snails on oceanic islands: Testing the general dynamic model of oceanic island biogeography using linear mixed effect models
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Cameron, R.A.D. Triantis, K.A. Parent, C.E. Guilhaumon, F. Alonso, M.R. Ibáñez, M. de Frias Martins, A.M. Ladle, R.J. Whittaker, R.J.
- Abstract
Aim: We collate and analyse data for land snail diversity and endemism, as a means of testing the explanatory power of the general dynamic model of oceanic island biogeography (GDM): a theoretical model linking trends in species immigration, speciation and extinction to a generalized island ontogeny. Location: Eight oceanic archipelagos: Azores, Canaries, Hawaii, Galápagos, Madeira, Samoa, Society, Tristan da Cunha. Methods: Using data obtained from literature sources we examined the power of the GDM through its derivative ATT2 model (i.e. diversity metric = b1 + b2Area + b3Time + b4Time2), in comparison with all the possible simpler models, e.g. including only area or time. The diversity metrics considered were the number of (1) native species, (2) archipelagic endemic species, and (3) single-island endemic species. Models were evaluated using both log-transformed and untransformed diversity data by means of linear mixed effect models. For Hawaii and the Canaries, responses of different major taxonomic groups were also analysed separately. Results: The ATT2 model was always included within the group of best models and, in many cases, was the single-best model and was particularly successful in fitting the log-transformed diversity metrics. In four archipelagos, a hump-shaped relationship with time (island age) is apparent, while the other four archipelagos show a general increase of species richness with island age. In Hawaii and the Canaries outcomes vary between different taxonomic groups. Main conclusions: The GDM is an intentionally simplified representation of environmental and diversity dynamics on oceanic islands, which predicts a simple positive relationship between diversity and island area combined with a humped response to time. We find broad support for the applicability of this model, especially when a full range of island developmental stages is present. However, our results also show that the varied mechanisms of island origins and the differing responses of major taxa should be taken into consideration when interpreting diversity metrics in terms of the GDM. This heterogeneity is reflected in the fact that no single model outperforms all the other models for all datasets analysed. © 2012 Blackwell Publishing Ltd.
- Published
- 2013
28. Accounting for data heterogeneity in patterns of biodiversity: An application of linear mixed effect models to the oceanic island biogeography of spore-producing plants
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Patiño, J. Guilhaumon, F. Whittaker, R.J. Triantis, K.A. Gradstein, S.R. Hedenäs, L. González-Mancebo, J.M. Vanderpoorten, A.
- Abstract
The general dynamic model of oceanic island biogeography describes the evolution of species diversity properties, including species richness (SR), through time. We investigate the hypothesis that SR in organisms with high dispersal capacities is better predicted by island area and elevation (as a surrogate of habitat diversity) than by time elapsed since island emergence and geographic isolation. Linear mixed effect models (LMMs) subjected to information theoretic model selection were employed to describe moss and liverwort SR patterns from 67 oceanic islands across 12 archipelagos. Random effects, which are used to modulate model parameters to take differences among archipelagos into account, included only a random intercept in the best-fit model for liverworts and in one of the two best-fit models for mosses. In this case, the other coefficients are constant across archipelagos, and we interpret the intercept as a measure of the intrinsic carrying capacity of islands within each archipelago, independently of their size, age, elevation and geographic isolation. The contribution of area and elevation to the models was substantially higher than that of time, with the least contribution made by measures of geographic isolation. This reinforces the idea that oceanic barriers are not a major impediment for migration in bryophytes and, together with the almost complete absence of in situ insular diversification, explains the comparatively limited importance of time in the models. We hence suggest that time per se has little independent role in explaining bryophyte SR and principally features as a variable accounting for the changing area and topographic complexity during the life-cycle of oceanic islands. Simple area models reflecting habitat availability and diversity might hence prevail over more complex temporal models reflecting in-situ speciation and dispersal (time, geographic connectivity) in explaining patterns of biodiversity for exceptionally mobile organisms. © 2013 The Authors.
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- 2013
29. The island species-area relationship: Biology and statistics
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Triantis, K.A. Guilhaumon, F. Whittaker, R.J.
- Abstract
Aim We conducted the most extensive quantitative analysis yet undertaken of the form taken by the island species-area relationship (ISAR), among 20 models, to determine: (1) the best-fit model, (2) the best-fit model family, (3) the best-fit ISAR shape (and presence of an asymptote), (4) system properties that may explain ISAR form, and (5) parameter values and interpretation of the logarithmic implementation of the power model. Location World-wide. Methods We amassed 601 data sets from terrestrial islands and employed an information-theoretic framework to test for the best-fit ISAR model, family, and shape, and for the presence/absence of an asymptote. Two main criteria were applied: generality (the proportion of cases for which the model provided an adequate fit) and efficiency (the overall probability of a model, when adequate, being the best at explaining ISARs; evaluated using the mean overall AIC c weight). Multivariate analyses were used to explore the potential of island system properties to explain trends in ISAR form, and to describe variation in the parameters of the logarithmic power model. Results Adequate fits were obtained for 465 data sets. The simpler models performed best, with the power model ranked first. Similar results were obtained at model family level. The ISAR form is most commonly convex upwards, without an asymptote. Island system traits had low descriptive power in relation to variation in ISAR form. However, the z and c parameters of the logarithmic power model show significant pattern in relation to island system type and taxon. Main conclusions Over most scales of space, ISARs are best represented by the power model and other simple models. More complex, sigmoid models may be applicable when the spatial range exceeds three orders of magnitude. With respect to the log power model, z-values are indicative of the process(es) establishing species richness and composition patterns, while c-values are indicative of the realized carrying capacity of the system per unit area. Variation in ISAR form is biologically meaningful, but the signal is noisy, as multiple processes constrain the ecological space available within island systems and the relative importance of these processes varies with the spatial scale of the system. © 2011 Blackwell Publishing Ltd.
- Published
- 2012
30. The Mediterranean Sea under siege : spatial overlap between marine biodiversity, cumulative threats and marine reserve
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Coll, M., Piroddi, C., Albouy, Camille, Ben Rais Lasram, F., Cheung, W.W.L., Christensen, V., Karpouzi, V.S., Guilhaumon, F., Mouillot, D., Paleczny, M., Lourdes Palomares, M., Steenbeek, J., Trujillo, P., Watson, R., and Pauly, D.
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POISSON MARIN ,CONSERVATION DE LA NATURE ,AIRE MARINE PROTEGEE ,ESPECE MENACEE ,BIODIVERSITE ,MAMMIFERE MARIN ,TORTUE AQUATIQUE ,OISEAU MARIN ,FACTEUR ANTHROPIQUE ,CARTOGRAPHIE ,IMPACT SUR L'ENVIRONNEMENT - Published
- 2011
31. The Biodiversity of the Mediterranean Sea: Estimates, Patterns, and Threats
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Coll, M, Piroddi, C, Steenbeek, J, Kaschner, K, Lasram, FB, Aguzzi, J, Ballesteros, E, Bianchi, CN, Corbera, J, Dailianis, T, Danovaro, R, Estrada, M, Froglia, C, Galil, BS, Gasol, JM, Gertwagen, R, Gil, J, Guilhaumon, F, Kesner-Reyes, K, Kitsos, MS, and Kouk
- Published
- 2010
32. The Mediterranean Sea as a 'cul-de-sac' for endemic fishes facing climate change
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Ben Rais Lasram, F., Guilhaumon, F., Albouy, Camille, Somot, S., Thuillers, W., and Mouillot, David
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POISSON MARIN ,VARIATION INTERANNUELLE ,MODELE ,ESPECE ENDEMIQUE ,CHANGEMENT CLIMATIQUE ,VULNERABILITE ,REPARTITION GEOGRAPHIQUE ,TEMPERATURE ,IMPACT SUR L'ENVIRONNEMENT - Published
- 2010
33. Temperature effects on Calanus helgolandicus (Copepoda: Calanoida) life cycle
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Bonnet, D. (Delphine), Harris, R.P. (Roger), Yebra, L. (Lidia), Guilhaumon, F. (Francois), Conway, D.V.P. (David V.P.), and Hirst, A.G.
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Centro Oceanográfico de Málaga ,Medio Marino - Abstract
Sí
- Published
- 2009
34. Arthropod diversity in a tropical forest
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Basset, Yves, Cizek, Lukas, Cuénoud, Philippe, Didham, Raphaël K., Guilhaumon, F., Missa, Olivier, Novotny, V., Odegaard, Frode, Roslin, T., Schmidl, Juergen, Tishechkin, Alexey, Winchester, Neville, Roubik, David Ward, Aberlenc, Henri-Pierre, Bail, Johannes, Barrios, Hector, Bridle, Jonathan R., Castaño-Meneses, Gabriela, Corbara, Bruno, Curletti, Gianfranco, DaRocha, W.D., De Bakker, D., Delabie, Jacques H. C., Dejean, Alain, Fagan, Laura, Floren, Andreas, Kitching, Roger L., Medianero, Enrique, Miller, S.E., Oliveira, E.G., Orivel, Jérôme, Pollet, M., Rapp, M., Ribeiro, Servio Pontes, Roisin, Yves, Schmidt, J.B., Sorensen, Line, Leponce, Maurice, Basset, Yves, Cizek, Lukas, Cuénoud, Philippe, Didham, Raphaël K., Guilhaumon, F., Missa, Olivier, Novotny, V., Odegaard, Frode, Roslin, T., Schmidl, Juergen, Tishechkin, Alexey, Winchester, Neville, Roubik, David Ward, Aberlenc, Henri-Pierre, Bail, Johannes, Barrios, Hector, Bridle, Jonathan R., Castaño-Meneses, Gabriela, Corbara, Bruno, Curletti, Gianfranco, DaRocha, W.D., De Bakker, D., Delabie, Jacques H. C., Dejean, Alain, Fagan, Laura, Floren, Andreas, Kitching, Roger L., Medianero, Enrique, Miller, S.E., Oliveira, E.G., Orivel, Jérôme, Pollet, M., Rapp, M., Ribeiro, Servio Pontes, Roisin, Yves, Schmidt, J.B., Sorensen, Line, and Leponce, Maurice
- Abstract
Most eukaryotic organisms are arthropods. Yet, their diversity in rich terrestrial ecosystems is still unknown. Here we produce tangible estimates of the total species richness of arthropods in a tropical rainforest. Using a comprehensive range of structured protocols, we sampled the phylogenetic breadth of arthropod taxa from the soil to the forest canopy in the San Lorenzo forest, Panama. We collected 6144 arthropod species from 0.48 hectare and extrapolated total species richness to larger areas on the basis of competing models. The whole 6000-hectare forest reserve most likely sustains 25,000 arthropod species. Notably, just 1 hectare of rainforest yields >60% of the arthropod biodiversity held in the wider landscape. Models based on plant diversity fitted the accumulated species richness of both herbivore and nonherbivore taxa exceptionally well. This lends credence to global estimates of arthropod biodiversity developed from plant models., SCOPUS: ar.j, SCOPUS: ar.j, info:eu-repo/semantics/published
- Published
- 2012
35. Slow growth of the overexploited milk shark Rhizoprionodon acutus affects its sustainability in West Africa.
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Ba, A., Diouf, K., Guilhaumon, F., and Panfili, J.
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FISH age ,FISH growth ,RHIZOPRIONODON ,FISH physiology ,SUSTAINABILITY - Abstract
Age and growth of Rhizoprionodon acutus were estimated from vertebrae age bands. From December 2009 to November 2010, 423 R. acutus between 37 and 112 cm total length ( L
T ) were sampled along the Senegalese coast. Marginal increment ratio was used to check annual band deposition. Three growth models were adjusted to the length at age and compared using Akaike's information criterion. The Gompertz growth model with estimated size at birth appeared to be the best and resulted in growth parameters of L∞ = 139·55 ( LT ) and K = 0·17 year−1 for females and L∞ = 126·52 ( LT ) and K = 0·18 year−1 for males. The largest female and male examined were 8 and 9 years old, but the majority was between 1 and 3 years old. Ages at maturity estimated were 5·8 and 4·8 years for females and males, respectively. These results suggest that R. acutus is a slow-growing species, which render the species particularly vulnerable to heavy fishery exploitation. The growth parameters estimated in this study are crucial for stock assessments and for demographic analyses to evaluate the sustainability of commercial harvests. [ABSTRACT FROM AUTHOR]- Published
- 2015
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- View/download PDF
36. How can quantitative ecology be attractive to young scientists? Balancing computer/desk work with fieldwork
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Gimenez, O., primary, Abadi, F., additional, Barnagaud, J‐Y., additional, Blanc, L., additional, Buoro, M., additional, Cubaynes, S., additional, Desprez, M., additional, Gamelon, M., additional, Guilhaumon, F., additional, Lagrange, P., additional, Madon, B., additional, Marescot, L., additional, Papadatou, E., additional, Papaïx, J., additional, Péron, G., additional, and Servanty, S., additional
- Published
- 2012
- Full Text
- View/download PDF
37. Fish diversity patterns in the Mediterranean Sea: deviations from a mid-domain model
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Ben Rais Lasram, F, primary, Guilhaumon, F, additional, and Mouillot, D, additional
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- 2009
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38. Reply to Bode and Murdoch: A proper integration of species-area relationship uncertainties into return on investment analyses is needed
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Guilhaumon, F., primary, Gimenez, O., additional, Gaston, K. J., additional, and Mouillot, D., additional
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- 2009
- Full Text
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39. Temperature effects on Calanus helgolandicus (Copepoda: Calanoida) development time and egg production
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Bonnet, D., primary, Harris, R. P., additional, Yebra, L., additional, Guilhaumon, F., additional, Conway, D. V. P., additional, and Hirst, A. G., additional
- Published
- 2008
- Full Text
- View/download PDF
40. Species abundance distributions and numerical dominance in gastrointestinal helminth communities of fish hosts
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Poulin, R., primary, Luque, J.L., additional, Guilhaumon, F., additional, and Mouillot, D., additional
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- 2008
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41. Ecological correlates of dispersal success of Lessepsian fishes
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Ben Rais Lasram, F, primary, Tomasini, JA, additional, Guilhaumon, F, additional, Romdhane, MS, additional, Do Chi, T, additional, and Mouillot, D, additional
- Published
- 2008
- Full Text
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42. La guerre et les épidémies : d'après les Mémoires de la Société des sciences médicales de Metz (3e édition) / par M. F. Guilhaumon
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Ligue internationale de la paix et de la liberté. Éditeur scientifique, Guilhaumon, F.. Auteur du texte, Ligue internationale de la paix et de la liberté. Éditeur scientifique, and Guilhaumon, F.. Auteur du texte
- Abstract
Collection : Bibliothèque de la paix ; 3, Collection : Bibliothèque de la paix ; 3, Appartient à l’ensemble documentaire : GTextes1, Avec mode texte
43. Ecological dependencies make remote reef fish communities most vulnerable to coral loss
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Giovanni Strona, Pieter S. A. Beck, Mar Cabeza, Simone Fattorini, François Guilhaumon, Fiorenza Micheli, Simone Montano, Otso Ovaskainen, Serge Planes, Joseph A. Veech, Valeriano Parravicini, Faculty of Biological and Environmental Sciences [Helsinki], Helsingin yliopisto = Helsingfors universitet = University of Helsinki, European Commission - Joint Research Centre [Ispra] (JRC), Helsinki Institute of Sustainability Science (HELSUS), Helsingin yliopisto = Helsingfors universitet = University of Helsinki-Helsingin yliopisto = Helsingfors universitet = University of Helsinki, University of L'Aquila [Italy] (UNIVAQ), MARine Biodiversity Exploitation and Conservation (UMR MARBEC), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Hopkins Marine Station [Stanford], Stanford University, Dipartimento di Scienze dell'Ambiente e del Territorio (DISAT), Università degli Studi di Milano = University of Milan (UNIMI), Centre de recherches insulaires et observatoire de l'environnement (CRIOBE), Université de Perpignan Via Domitia (UPVD)-École Pratique des Hautes Études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Texas State University, ANR-17-CE32-0006,REEFLUX,Flux d'énergie au sein des récifs coralliens: une perspective basée sur les vertébrés(2017), Organismal and Evolutionary Biology Research Programme, Ecological Data Science, Global Change and Conservation Lab, Mar Cabeza-Jaimejuan / Principal Investigator, Biosciences, Otso Ovaskainen / Principal Investigator, Strona, G, Beck, P, Cabeza, M, Fattorini, S, Guilhaumon, F, Micheli, F, Montano, S, Ovaskainen, O, Planes, S, Veech, J, and Parravicini, V
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0106 biological sciences ,Richness ,conservation biology ,ekologiset verkostot ,General Physics and Astronomy ,01 natural sciences ,Conservation of Natural Resource ,Anthropogenic Effect ,meriekologia ,Patterns ,0303 health sciences ,Diversity ,Multidisciplinary ,Conservation biology ,Coral Reefs ,Anthropogenic Effects ,Climate-change ecology ,Fishes ,Biodiversity ,Anthozoa ,Habitat ,1181 Ecology, evolutionary biology ,Coral Reef ,Human ,climate-change ecology ,Conservation of Natural Resources ,[SDE.MCG]Environmental Sciences/Global Changes ,Science ,Climate Change ,Biotic interactions ,010603 evolutionary biology ,General Biochemistry, Genetics and Molecular Biology ,Article ,koralliriutat ,03 medical and health sciences ,Animals ,Coral Bleaching ,Humans ,Spatial Analysis ,Food-web ,ecological networks ,14. Life underwater ,030304 developmental biology ,Animal ,kalakannat ,General Chemistry ,Disturbance ,Spatial Analysi ,ilmastonmuutokset ,15. Life on land ,biodiversiteetti ,13. Climate action ,Ecological networks ,[SDE.BE]Environmental Sciences/Biodiversity and Ecology ,Fishe - Abstract
Ecosystems face both local hazards, such as over-exploitation, and global hazards, such as climate change. Since the impact of local hazards attenuates with distance from humans, local extinction risk should decrease with remoteness, making faraway areas safe havens for biodiversity. However, isolation and reduced anthropogenic disturbance may increase ecological specialization in remote communities, and hence their vulnerability to secondary effects of diversity loss propagating through networks of interacting species. We show this to be true for reef fish communities across the globe. An increase in fish-coral dependency with the distance of coral reefs from human settlements, paired with the far-reaching impacts of global hazards, increases the risk of fish species loss, counteracting the benefits of remoteness. Hotspots of fish risk from fish-coral dependency are distinct from those caused by direct human impacts, increasing the number of risk hotspots by ~30% globally. These findings might apply to other ecosystems on Earth and depict a world where no place, no matter how remote, is safe for biodiversity, calling for a reconsideration of global conservation priorities., Coral reefs face both local and global stressors. Here, the authors show how a positive relationship between distance from human settlements and ecological specialisation makes remote coral reef fish communities more vulnerable to coral loss.
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- 2021
44. Global tropical reef fish richness could decline by around half if corals are lost
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Valeriano Parravicini, Simone Montano, Paolo Galli, Roberto Arrigoni, Giovanni Strona, Kevin D. Lafferty, François Guilhaumon, Serge Planes, Davide Seveso, Simone Fattorini, Pieter S. A. Beck, Ecological Data Science, Organismal and Evolutionary Biology Research Programme, Faculty of Biological and Environmental Sciences, MARine Biodiversity Exploitation and Conservation (UMR MARBEC), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut de Recherche pour le Développement (IRD), Strona, G, Lafferty, K, Fattorini, S, Beck, P, Guilhaumon, F, Arrigoni, R, Montano, S, Seveso, D, Galli, P, Planes, S, and Parravicini, V
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0106 biological sciences ,Coral reef fish ,[SDE.MCG]Environmental Sciences/Global Changes ,Oceans and Seas ,Effects of global warming on oceans ,DIVERSITY ,Biodiversity ,structural equation modelling ,010603 evolutionary biology ,01 natural sciences ,General Biochemistry, Genetics and Molecular Biology ,co-extinction ,Structural complexity ,ocean warming ,Animals ,Humans ,14. Life underwater ,co-extinctions ,Reef ,1172 Environmental sciences ,General Environmental Science ,geography.geographical_feature_category ,Ecology ,General Immunology and Microbiology ,Resistance (ecology) ,Coral Reefs ,Tetraodontiformes ,HABITAT COMPLEXITY ,010604 marine biology & hydrobiology ,Fishes ,Community structure ,bleaching ,Anthozoa ,General Medicine ,STRUCTURAL COMPLEXITY ,15. Life on land ,Geography ,13. Climate action ,PATTERNS ,Species richness ,[SDE.BE]Environmental Sciences/Biodiversity and Ecology ,General Agricultural and Biological Sciences ,COMMUNITY STRUCTURE ,RESISTANCE - Abstract
WOS:000669987000010; Reef fishes are a treasured part of marine biodiversity, and also provide needed protein for many millions of people. Although most reef fishes might survive projected increases in ocean temperatures, corals are less tolerant. A few fish species strictly depend on corals for food and shelter, suggesting that coral extinctions could lead to some secondary fish extinctions. However, secondary extinctions could extend far beyond those few coral-dependent species. Furthermore, it is yet unknown how such fish declines might vary around the world. Current coral mass mortalities led us to ask how fish communities would respond to coral loss within and across oceans. We mapped 6964 coral-reef-fish species and 119 coral genera, and then regressed reef-fish species richness against coral generic richness at the 1 degrees scale (after controlling for biogeographic factors that drive species diversification). Consistent with small-scale studies, statistical extrapolations suggested that local fish richness across the globe would be around half its current value in a hypothetical world without coral, leading to more areas with low or intermediate fish species richness and fewer fish diversity hotspots.
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- 2021
45. Species-area relationships as a tool for the conservation of benthic invertebrates in Italian coastal lagoons
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Enrico Barbone, François Guilhaumon, Alberto Basset, David Mouillot, Guilhaumon, F., Basset, Alberto, Barbone, E., and Mouillot, D.
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0106 biological sciences ,conservation biology ,model selection ,non-parametric richness ,Aquatic Science ,Biology ,estimators ,Oceanography ,010603 evolutionary biology ,01 natural sciences ,transitional waters ,Water Framework Directive ,zoobenthos ,14. Life underwater ,Invertebrate ,geography ,geography.geographical_feature_category ,Ecology ,010604 marine biology & hydrobiology ,Estuary ,Body size and species richness ,15. Life on land ,Habitat ,Benthic zone ,Species richness ,Conservation biology - Abstract
Over the recent decades, the preservation of coastal and estuarine waters has been recognised as a priority at national and international levels. At the European scale, the Water Framework Directive (WFD) was established with the aim to achieve a good ecological status of all significant water bodies by the year 2015. Among the descriptors used to define the ecological status of water bodies, taxonomic diversity (usually species richness) is a widespread metric employed across taxa and habitats. However, species richness is known to increase with area at a decelerating rate, producing the species–area relationship (SAR). Thus, removing the effect of area (even in case of low magnitude), is mandatory before comparing species richness between sites. Here we tested recently developed multi-model SARs as a standardisation tool for comparing benthic species richness (annelids, arthropods, molluscs and total species richness) in 18 Italian coastal lagoons with a surface area ranging from 0.19 to 552 km2, i.e. three orders of magnitude. However, the sampling effort was often incompletely described and certainly heterogeneous among the studies retrieved from the database. Therefore, we used the number of studies as a proxy for the sampling effort in each lagoon and estimated species richness from observed values using non-parametric occurrence-based estimators. We further corrected for bias that might be induced by sampling efforts being unrepresentative for the surface area of different lagoons. After applying these corrections, we estimated that c. 25–30% of species richness could be explained by surface area. We investigated the spatial congruence of species richness patterns across taxa and showed that molluscs could serve as a potential surrogate for total macro-invertebrate species richness. We further found that the intensity of conservation focus and the gradient of ecological status are decoupled in Italian coastal lagoons. More generally, our study pave the way for the use of flexible tools for the comparison of species richness across water bodies in the context of the WFD.
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- 2012
46. Low human interest for the most at-risk reef fishes worldwide.
- Author
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Mouquet N, Langlois J, Casajus N, Auber A, Flandrin U, Guilhaumon F, Loiseau N, McLean M, Receveur A, Stuart Smith RD, and Mouillot D
- Subjects
- Animals, Humans, Climate Change, Phylogeny, Fisheries, Fishes physiology, Conservation of Natural Resources, Coral Reefs, Biodiversity
- Abstract
Human interest in biodiversity is essential for effective conservation action but remains poorly quantified at large scales. Here, we investigated human interest for 2408 marine reef fishes using data obtained from online public databases and social media, summarized in two synthetic dimensions, research effort and public attention. Both dimensions are mainly related to geographic range size. Research effort is also linked to fishery importance, while public attention is more related to fish aesthetic value and aquarium trade importance. We also found a strong phylogenetic bias, with certain fish families receiving disproportional research effort and public attention. Most concerningly, species at the highest risk of extinction and those most vulnerable to future climate change tend to receive less research effort and public attention. Our results provide a lens through which examining the societal attention that species garner, with the ultimate goals to improve conservation strategies, research programs, and communication plans.
- Published
- 2024
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47. Early signals of Posidonia oceanica meadows recovery in a context of wastewater treatment improvements.
- Author
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Bockel T, Marre G, Delaruelle G, Agel N, Boissery P, Guilhaumon F, Mouquet N, Mouillot D, Guilbert A, and Deter J
- Subjects
- Grassland, Mediterranean Sea, Temperature, Ecosystem, Alismatales physiology
- Abstract
Natural ecological restoration is a cornerstone of modern conservation science and managers need more documented "success stories" to lead the way. In French mediterranean sea, we monitored Posidonia oceanica lower limit using acoustic telemetry and photogrammetry and investigated the descriptors driving its variations, at a national scale and over more than a decade. We showed significant effects of environmental descriptors (region, sea surface temperature and bottom temperature) but also of wastewater treatment plant (WWTP) effluents proxies (size of WWTP, time since conformity, and distance to the closest effluent) on the meadows lower limit progression. This work indicates a possible positive response of P. oceanica meadows to improvements in wastewater treatment and a negative effect of high temperatures. While more data is needed, the example of French wastewater policy should inspire stakeholders and coastal managers in their efforts to limit anthropogenic pressures on vulnerable ecosystems., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)
- Published
- 2024
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48. Microplastics in the insular marine environment of the Southwest Indian Ocean carry a microbiome including antimicrobial resistant (AMR) bacteria: A case study from Reunion Island.
- Author
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Sababadichetty L, Miltgen G, Vincent B, Guilhaumon F, Lenoble V, Thibault M, Bureau S, Tortosa P, Bouvier T, and Jourand P
- Subjects
- Humans, Indian Ocean, Microplastics, Plastics, Reunion, Bacteria, Environmental Monitoring, Microbiota, Water Pollutants, Chemical analysis
- Abstract
The increasing threats to ecosystems and humans from marine plastic pollution require a comprehensive assessment. We present a plastisphere case study from Reunion Island, a remote oceanic island located in the Southwest Indian Ocean, polluted by plastics. We characterized the plastic pollution on the island's coastal waters, described the associated microbiome, explored viable bacterial flora and the presence of antimicrobial resistant (AMR) bacteria. Reunion Island faces plastic pollution with up to 10,000 items/km
2 in coastal water. These plastics host microbiomes dominated by Proteobacteria (80 %), including dominant genera such as Psychrobacter, Photobacterium, Pseudoalteromonas and Vibrio. Culturable microbiomes reach 107 CFU/g of microplastics, with dominance of Exiguobacterium and Pseudomonas. Plastics also carry AMR bacteria including β-lactam resistance. Thus, Southwest Indian Ocean islands are facing serious plastic pollution. This pollution requires vigilant monitoring as it harbors a plastisphere including AMR, that threatens pristine ecosystems and potentially human health through the marine food chain., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023 Elsevier Ltd. All rights reserved.)- Published
- 2024
- Full Text
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49. Effects of Madagascar marine reserves on juvenile and adult coral abundance, and the implication for population regulation.
- Author
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Randrianarivo M, Botosoamananto RL, Guilhaumon F, Penin L, Todinanahary G, and Adjeroud M
- Subjects
- Animals, Coral Reefs, Madagascar, Anthozoa physiology
- Abstract
Recruitment is a critical component in the dynamics of coral assemblages, and a key question is to determine the degree to which spatial heterogeneity of adults is influenced by pre-vs. post-settlement processes. We analyzed the density of juvenile and adult corals among 18 stations located at three regions around Madagascar, and examined the effects of Marine Protected Areas (MPAs). Our survey did not detect a positive effect of MPAs on juveniles, except for Porites at the study scale. The MPA effect was more pronounced for adults, notably for Acropora, Montipora, Seriatopora, and Porites at the regional scale. For most dominant genera, densities of juveniles and adults were positively correlated at the study scale, and at least at one of the three regions. These outcomes suggest recruitment-limitation relationships for several coral taxa, although differences in post-settlement events may be sufficiently strong to distort the pattern established at settlement for other populations. The modest benefits of MPAs on the density of juvenile corals demonstrated here argue in favor of strengthening conservation measures more specifically focused to protect recruitment processes., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023 Elsevier Ltd. All rights reserved.)
- Published
- 2023
- Full Text
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50. A global analysis of avian island diversity-area relationships in the Anthropocene.
- Author
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Matthews TJ, Wayman JP, Whittaker RJ, Cardoso P, Hume JP, Sayol F, Proios K, Martin TE, Baiser B, Borges PAV, Kubota Y, Dos Anjos L, Tobias JA, Soares FC, Si X, Ding P, Mendenhall CD, Sin YCK, Rheindt FE, Triantis KA, Guilhaumon F, Watson DM, Brotons L, Battisti C, Chu O, and Rigal F
- Subjects
- Animals, Phylogeny, Islands, Ecosystem, Biodiversity, Birds
- Abstract
Research on island species-area relationships (ISAR) has expanded to incorporate functional (IFDAR) and phylogenetic (IPDAR) diversity. However, relative to the ISAR, we know little about IFDARs and IPDARs, and lack synthetic global analyses of variation in form of these three categories of island diversity-area relationship (IDAR). Here, we undertake the first comparative evaluation of IDARs at the global scale using 51 avian archipelagic data sets representing true and habitat islands. Using null models, we explore how richness-corrected functional and phylogenetic diversity scale with island area. We also provide the largest global assessment of the impacts of species introductions and extinctions on the IDAR. Results show that increasing richness with area is the primary driver of the (non-richness corrected) IPDAR and IFDAR for many data sets. However, for several archipelagos, richness-corrected functional and phylogenetic diversity changes linearly with island area, suggesting that the dominant community assembly processes shift along the island area gradient. We also find that archipelagos with the steepest ISARs exhibit the biggest differences in slope between IDARs, indicating increased functional and phylogenetic redundancy on larger islands in these archipelagos. In several cases introduced species seem to have 're-calibrated' the IDARs such that they resemble the historic period prior to recent extinctions., (© 2023 The Authors. Ecology Letters published by John Wiley & Sons Ltd.)
- Published
- 2023
- Full Text
- View/download PDF
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