21 results on '"Borges, Paulo A. V."'
Search Results
2. How do different dispersal modes shape the species-area relationship? Evidence for between-group coherence in the Macaronesian flora
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Aranda, Silvia C., Gabriel, Rosalina, Borges, Paulo A. V., Santos, Ana M. C., Hortal, Joaquín, Baselga, Andrés, and Lobo, Jorge M.
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- 2013
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3. Phylogeography and molecular phylogeny of Macaronesian island Tarphius (Coleoptera: Zopheridae): why are there so few species in the Azores?
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Amorim, Isabel R., Emerson, Brent C., Borges, Paulo A. V., and Wayne, Robert K.
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- 2012
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4. The Importance of Including Spatial Autocorrelation When Modelling Species Richness in Archipelagos: A Bayesian Approach.
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Barros, Diogo Duarte, Mathias, Maria da Luz, Borges, Paulo A. V., and Borda-de-Água, Luís
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SPECIES diversity ,ARCHIPELAGOES ,GAUSSIAN processes ,NUMBERS of species ,SEA level ,CANARIES - Abstract
One of the aims of island biogeography theory is to explain the number of species in an archipelago. Traditionally, the variables used to explain the species richness on an island are its area and distance to the mainland. However, increasing evidence suggests that accounting for other variables is essential for better estimates. In particular, the distance between islands should play a role in determining species richness. This work uses a Bayesian framework using Gaussian processes to assess whether distance to neighbouring islands (spatial autocorrelation) can better explain arthropod species richness patterns in the Azores Archipelago and in the Canary Islands. This method is flexible and allows the inclusion of other variables, such as maximum altitude above sea level (elevation). The results show that accounting for spatial autocorrelation provides the best results for both archipelagos, but overall, spatial autocorrelation seems to be more important in the Canary archipelago. Similarly, elevation plays a more important role in determining species richness in the Canary Islands. We recommend that spatial autocorrelation should always be considered when modelling an archipelago's species richness. [ABSTRACT FROM AUTHOR]
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- 2023
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5. Resolving the Azorean knot: a response to Carine & Schaefer (2010)
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Triantis, Kostas A., Hortal, Joaquín, Amorim, Isabel, Cardoso, Pedro, Santos, Ana M. C., Gabriel, Rosalina, Borges, Paulo A. V., and Fernández-Palacios, José Maria
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- 2012
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6. Species pool structure determines the level of generalism of island parasitoid faunas
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Santos, Ana M. C., Quicke, Donald L. J., Borges, Paulo A. V., and Hortal, Joaquín
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- 2011
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7. Are species-area relationships from entire archipelagos congruent with those of their constituent islands?
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Santos, Ana M. C., Whittaker, Robert J., Triantis, Kostas A., Borges, Paulo A. V., Jones, Owen R., Quicke, Donald L. J., and Hortal, Joaquín
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- 2010
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8. Drivers of diversity in Macaronesian spiders and the role of species extinctions
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Cardoso, Pedro, Arnedo, Miquel A., Triantis, Kostas A., and Borges, Paulo A. V.
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- 2010
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9. Time, Area and Isolation: Factors Driving the Diversification of Azorean arthropods
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Borges, Paulo A. V., Hortal, Joaquín, and Heaney, Lawrence
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- 2009
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10. Measurements of Area and the (Island) Species-Area Relationship: New Directions for an Old Pattern
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Triantis, Kostas A., Nogués-Bravo, David, Hortal, Joaquín, Borges, Paulo A. V., Adsersen, Henning, Fernández-Palacios, José María, Araújo, Miguel B., and Whittaker, Robert J.
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- 2008
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11. Bryophytes of Azorean parks and gardens (I): "Reserva Florestal de Recreio do Pinhal da Paz" - São Miguel Island.
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POLAINO-MARTIN, CLARA, GABRIEL, ROSALINA, BORGES, PAULO A. V., CRUZ, RICARDO, and ALBERGARIA, ISABEL S.
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BRYOPHYTES ,URBAN parks ,SPECIES distribution ,BIOGEOGRAPHY - Abstract
Historic urban parks and gardens are increasingly being considered as interesting refuges for a great number of species, including some rare taxa, otherwise almost absent from urban areas, such as many bryophytes and other biota that are not their main focus. After a bibliographic work, the "Reserva Florestal de Recreio do Pinhal da Paz" (RFR-PP), in São Miguel Island (Azores), stood out as one of the least studied areas of the region, without any bryophyte' references. Thus, the aim of this study was to identify the most striking bryophyte species present along the main visitation track of RFR-PP, in order to increase its biodiversity knowledge. Bryophytes growing on rocks, soil or tree bark were collected adhoc, in 17 sites, ca. 100 m apart from each other. In total, 43 species were identified: 23 mosses, 19 liverworts, and one hornwort, encompassing five classes, 15 orders and 27 families. Seven species are endemic from Europe and three from Macaronesia. No invasive bryophytes were found in the surveyed area. These results update the distribution data of São Miguel Island, show that Azorean parks and gardens contribute to the community dynamics of bryophytes at lower elevation and add a new layer of interest to the visitors of RFR-PP. [ABSTRACT FROM AUTHOR]
- Published
- 2020
12. Differential temporal beta‐diversity patterns of native and non‐native arthropod species in a fragmented native forest landscape.
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Matthews, Thomas J., Sadler, Jon, Carvalho, Rui, Nunes, Rui, and Borges, Paulo A. V.
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INTRODUCED species ,BIOGEOGRAPHY ,ARTHROPOD populations ,BIODIVERSITY conservation ,FRAGMENTED landscapes - Abstract
An important factor that hinders the management of non‐native species is a general lack of information regarding the biogeography of non‐natives, and, in particular, their rates of turnover. Here, we address this research gap by analysing differences in temporal beta‐diversity (using both pairwise and multiple‐time dissimilarity metrics) between native and non‐native species, using a novel time‐series dataset of arthropods sampled in native forest fragments in the Azores. We use a null model approach to determine whether temporal beta‐diversity was due to deterministic processes or stochastic colonisation and extinction events, and linear modelling selection to assess the factors driving variation in temporal beta‐diversity between plots. In accordance with our predictions, we found that the temporal beta‐diversity was much greater for non‐native species than for native species, and the null model analyses indicated that the turnover of non‐native species was due to stochastic events. No predictor variables were found to explain the turnover of native or non‐native species. We attribute the greater turnover of non‐native species to source‐sink processes and the close proximity of anthropogenic habitats to the fragmented native forest plots sampled in our study. Thus, our findings point to ways in which the study of turnover can be adapted for future applications in habitat island systems. The implications of this for biodiversity conservation and management are significant. The high rate of stochastic turnover of non‐native species indicates that attempts to simply reduce the populations of non‐native species in situ within native habitats may not be successful. A more efficient management strategy would be to interrupt source‐sink dynamics by improving the harsh boundaries between native and adjacent anthropogenic habitats. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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13. Oceanic island biogeography through the lens of the general dynamic model: assessment and prospect.
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Borregaard, Michael K., Amorim, Isabel R., Borges, Paulo A. V., Cabral, Juliano S., Fernández‐Palacios, José M., Field, Richard, Heaney, Lawrence R., Kreft, Holger, Matthews, Thomas J., Olesen, Jens M., Price, Jonathan, Rigal, Francois, Steinbauer, Manuel J., Triantis, Konstantinos A., Valente, Luis, Weigelt, Patrick, and Whittaker, Robert J.
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BIOGEOGRAPHY ,ISLANDS ,BIOLOGICAL extinction ,GEODIVERSITY ,EVOLUTIONARY theories - Abstract
ABSTRACT The general dynamic model of oceanic island biogeography ( GDM) has added a new dimension to theoretical island biogeography in recognizing that geological processes are key drivers of the evolutionary processes of diversification and extinction within remote islands. It provides a dynamic and essentially non-equilibrium framework generating novel predictions for emergent diversity properties of oceanic islands and archipelagos. Its publication in 2008 coincided with, and spurred on, renewed attention to the dynamics of remote islands. We review progress, both in testing the GDM's predictions and in developing and enhancing ecological-evolutionary understanding of oceanic island systems through the lens of the GDM. In particular, we focus on four main themes: ( i) macroecological tests using a space-for-time rationale; ( ii) extensions of theory to islands following different patterns of ontogeny; ( iii) the implications of GDM dynamics for lineage diversification and trait evolution; and ( iv) the potential for downscaling GDM dynamics to local-scale ecological patterns and processes within islands. We also consider the implications of the GDM for understanding patterns of non-native species diversity. We demonstrate the vitality of the field of island biogeography by identifying a range of potentially productive lines for future research. [ABSTRACT FROM AUTHOR]
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- 2017
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14. Modeling directional spatio-temporal processes in island biogeography.
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Carvalho, José C., Cardoso, Pedro, Rigal, François, Triantis, Kostas A., and Borges, Paulo A. V.
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BIOGEOGRAPHY ,ARCHIPELAGOES ,SPATIO-temporal variation ,ECOLOGICAL heterogeneity ,COMPARATIVE biology - Abstract
A key challenge in island biogeography is to quantity the role of dispersal in shaping biodiversity patterns among the islands of a given archipelago. Here, we propose such a framework. Dispersal within oceanic archipelagos may be conceptualized as a spatio-temporal process dependent on: (1) the spatial distribution of islands, because the probability of successful dispersal is inversely related to the spatial distance between islands and (2) the chronological sequence of island formation that determines the directional asymmetry of dispersal (hypothesized to be predominantly from older to younger islands). From these premises, directional network models may be constructed, representing putative connections among islands. These models may be translated to eigenfunctions in order to be incorporated into statistical analysis. The framework was tested with 12 datasets from the Hawaii, Azores, and Canaries. The explanatory power of directional network models for explaining species composition patterns, assessed by the Jaccard dissimilarity index, was compared with simpler time-isolation models. The amount of variation explained by the network models ranged from 5.5% (for Coleoptera in Hawaii) to 60.2% (for Pteridophytes in Canary Islands). In relation to the four studied taxa, the variation explained by network models was higher for Pteridophytes in the three archipelagos. By the contrary, small fractions of explained variation were observed for Coleoptera (5.5%) and Araneae (8.6%) in Hawaii. Time-isolation models were, in general, not statistical significant and explained less variation than the equivalent directional network models for all the datasets. Directional network models provide a way for evaluating the spatio-temporal signature of species dispersal. The method allows building scenarios against which hypotheses about dispersal within archipelagos may be tested. The new framework may help to uncover the pathways via which species have colonized the islands of a given archipelago and to understand the origins of insular biodiversity. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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15. Calling for a new strategy to measure environmental (habitat) diversity in Island Biogeography: a case study of Mediterranean tenebrionids (Coleoptera: Tenebrionidae).
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FATTORINI, Simone, DAPPORTO, Leonardo, STRONA, Giovanni, and BORGES, Paulo A. V.
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HABITATS ,BIODIVERSITY ,BIOGEOGRAPHY ,TENEBRIONIDAE - Abstract
Many recent researches in island biogeography attempted to disentangle the effects of area per se and "habitat diversity" on species richness. However, the expression "habitat diversity" in this context should be avoided, because habitats can be only recognized by referring to the resources needed by a particular species. What is really measured in such researches is some form of "environmental heterogeneity". Although habitat heterogeneity can be measured in various ways, most researches in island biogeography simply used the number of biotopes (typically classified as land cover categories). However, not all biotopes have the same surface. On the basis of the area occupied by each land cover category, it is possible to calculate indices of environmental diversity, evenness and dominance, as commonly done in community ecology research. These indices can be used to investigate the role of environmental diversity in determining species richness. We used the tenebrionid beetles inhabiting twenty-five small islands around Sicily (Central Mediterranean) to illustrate these concepts. We found that both area per se and environmental heterogeneity contributed to determine species richness. Moreover, we found that the relationship between species richness and environmental homogeneity followed a power function model. This indicates that environmental homogenization may determine a rapid, non linear decline in species richness. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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16. Functional biogeography of oceanic islands and the scaling of functional diversity in the Azores.
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Whittaker, Robert J., Rigal, François, Borges, Paulo A. V., Cardoso, Pedro, Terzopoulou, Sofia, Casanoves, Fernando, Pla, Laura, Guilhaumon, François, Ladle, Richard J., and Triantis, Kostas A.
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BIODIVERSITY ,BIOGEOGRAPHY ,HABITATS ,BEETLES ,SPIDERS - 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. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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17. Geographical, Temporal and Environmental Determinants of Bryophyte Species Richness in the Macaronesian Islands.
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Aranda, Silvia C., Gabriel, Rosalina, Borges, Paulo A. V., Santos, Ana M. C., de Azevedo, Eduardo Brito, Patiño, Jairo, Hortal, Joaquín, and Lobo, Jorge M.
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BRYOPHYTES ,PLANT species ,SPECIES diversity ,PLANT diversity ,PLANT habitats - Abstract
Species richness on oceanic islands has been related to a series of ecological factors including island size and isolation (i.e. the Equilibrium Model of Island Biogeography, EMIB), habitat diversity, climate (i.e., temperature and precipitation) and more recently island ontogeny (i.e. the General Dynamic Model of oceanic island biogeography, GDM). Here we evaluate the relationship of these factors with the diversity of bryophytes in the Macaronesian region (Azores, Madeira, Canary Islands and Cape Verde). The predictive power of EMIB, habitat diversity, climate and the GDM on total bryophyte richness, as well as moss and liverwort richness (the two dominant bryophyte groups), was evaluated through ordinary least squares regressions. After choosing the best subset of variables using inference statistics, we used partial regression analyses to identify the independent and shared effects of each model. The variables included within each model were similar for mosses and liverworts, with orographic mist layer being one of the most important predictors of richness. Models combining climate with either the GDM or habitat diversity explained most of richness variation (up to 91%). There was a high portion of shared variance between all pairwise combinations of factors in mosses, while in liverworts around half of the variability in species richness was accounted for exclusively by climate. Our results suggest that the effects of climate and habitat are strong and prevalent in this region, while geographical factors have limited influence on Macaronesian bryophyte diversity. Although climate is of great importance for liverwort richness, in mosses its effect is similar to or, at least, indiscernible from the effect of habitat diversity and, strikingly, the effect of island ontogeny. These results indicate that for highly vagile taxa on oceanic islands, the dispersal process may be less important for successful colonization than the availability of suitable ecological conditions during the establishment phase. [ABSTRACT FROM AUTHOR]
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- 2014
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18. Measuring fractions of beta diversity and their relationships to nestedness: a theoretical and empirical comparison of novel approaches.
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Carvalho, José C., Cardoso, Pedro, Borges, Paulo A. V., Schmera, Dénes, and Podani, János
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BIODIVERSITY ,EMPIRICAL research ,COMPARATIVE studies ,BIOGEOGRAPHY ,ECOLOGICAL research ,CONSERVATION biology ,SIMULATION methods & models - Abstract
Beta diversity and nestedness are central concepts of ecology and biogeography and evaluation of their relationships is in the focus of contemporary ecological and conservation research. Beta diversity patterns are originated from two distinct processes: the replacement (or turnover) of species and the loss (or gain) of species leading to richness differences. Nested distributional patterns are generally thought to have a component deriving from beta diversity which is independent of replacement processes. Quantification of these phenomena is often made by calculating a measure of beta diversity, and the resulting value being subsequently partitioned into a contribution by species replacement plus a fraction shared by beta diversity and nestedness. Three methods have been recently proposed for such partitioning, all of them based on pairwise comparisons of sites. In this paper, the performance of these methods was evaluated on theoretical grounds and tested by a simulation study in which different gradients of dissimilarity, with known degrees of species replacement and species loss, were created. Performance was also tested using empirical data addressing land-use induced changes in endemic arthropod communities of the Terceira Island in the Azores. We found that the partitioning of β
cc (dissimilarity in terms of the Jaccard index) into two additive fractions, β-3 (dissimilarity due to species replacement) plus βrich (dissimilarity due to richness differences) reflects the species replacement and species loss processes across the simulated gradients in an ecologically and mathematically meaningful way, whilst the other two methods lack mathematical consistency and prove conceptually self-contradictory. Moreover, the first method identified a selective local extinction process for endemic arthropods, triggered by land-use changes, while the latter two methods overweighted the replacement component and led to false conclusions. Their basic flaw derives from the fact that the proposed replacement and nestedness components (deemed to account for species loss) are not scaled in the same way as the measure that accounts for the total dissimilarity (Sørensen and Jaccard indices). We therefore recommend the use of βcc =β-3 +βrich , since its components are scaled in the same units and their responses are proportional to the replacement and the gain/loss of species. [ABSTRACT FROM AUTHOR]- Published
- 2013
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19. Integrating Landscape Disturbance and Indicator Species in Conservation Studies
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Cardoso, Pedro, Rigal, François, Fattorini, Simone, Terzopoulou, Sofia, and Borges, Paulo A. V.
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STATISTICS ,CONSERVATION biology ,LAND use ,BIOTIC communities ,BIODIVERSITY ,POPULATION biology - Abstract
Successful conservation plans are conditioned by our ability to detect anthropogenic change in space and time and various statistical analyses have been developed to handle this critical issue. The main objective of this paper is to illustrate a new approach for spatial analysis in conservation biology. Here, we propose a two-step protocol. First, we introduce a new disturbance metric which provides a continuous measure of disturbance for any focal communities on the basis of the surrounding landscape matrix. Second, we use this new gradient to estimate species and community disturbance thresholds by implementing a recently developed method called Threshold Indicator Taxa ANalysis (TITAN). TITAN detects changes in species distributions along environmental gradients using indicators species analysis and assesses synchrony among species change points as evidence for community thresholds. We demonstrate our method with soil arthropod assemblages along a disturbance gradient in Terceira Island (Azores, Portugal). We show that our new disturbance metric realistically reflects disturbance patterns, especially in buffer zones (ecotones) between land use categories. By estimating species disturbance thresholds with TITAN along the disturbance gradient in Terceira, we show that species significantly associated with low disturbance differ from those associated with high disturbance in their biogeographical origin (endemics, non-endemic natives and exotics) and taxonomy (order). Finally, we suggest that mapping the disturbance community thresholds may reveal areas of primary interest for conservation, since these may host indigenous species sensitive to high disturbance levels. This new framework may be useful when: (1) both local and regional processes are to be reflected on single disturbance measures; (2) these are better quantified in a continuous gradient; (3) mapping disturbance of large regions using fine scales is necessary; (4) indicator species for disturbance are searched for and; (5) community thresholds are useful to understand the global dynamics of habitats. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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20. The effects of land-use change on arthropod richness and abundance on Santa Maria Island (Azores): unmanaged plantations favour endemic beetles.
- Author
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Meijer, Seline S., Whittaker, Robert J., and Borges, Paulo A. V.
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ARTHROPODA ,SPECIES diversity ,ENDEMIC animals ,BEETLES ,CRYPTOMERIA japonica ,BIOGEOGRAPHY ,HOST plants - Abstract
We study how endemic, native and introduced arthropod species richness, abundance, diversity and community composition vary between four different habitat types (native forest, exotic forest of Cryptomeria japonica, semi-natural pasture and intensive pasture) and how arthropod richness and abundance change with increasing distance from the native forest in adjacent habitat types in Santa Maria Island, the Azores. Arthropods were sampled in four 150 m long transects in each habitat type. Arthropods were identified to species level and classified as Azorean endemic, single-island endemic (SIE), native, or introduced. The native forest had the highest values for species richness of Azorean endemics, SIEs and natives; and also had highest values of Azorean endemic diversity (Fisher's alpha). In contrast, the intensive pasture had the lowest values for endemic and native species richness and diversity, but the highest values of total arthropod abundance and introduced species richness and diversity. Arthropod community composition was significantly different between the four habitat types. In the semi-natural pasture, the number of SIE species decreased with increasing distance from the native forest, and in the exotic forest the abundance of both Azorean endemics and SIEs decreased with increasing distance from the native forest. There is a gradient of decreasing arthropod richness and abundance from the native forest to the intensive pasture. Although this study demonstrates the important role of the native forest in arthropod conservation in the Azores, it also shows that unmanaged exotic forests have provided alternative habitat suitable for some native species of forest specialist arthropods, particularly saproxylic beetles. [ABSTRACT FROM AUTHOR]
- Published
- 2011
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21. Spatial Origin and Diversification of the Lycocerus fainanus Species Group (Coleoptera, Cantharidae), with Descriptions of Four New Species from China and Vietnam †.
- Author
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Xi, Huacong, Wang, Younan, Liu, Tong, Yang, Xingke, Liu, Haoyu, Yang, Yuxia, and Borges, Paulo A. V.
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SPECIES ,VICARIANCE ,MARKOV chain Monte Carlo ,PHYLOGENY ,FOSSILS ,MOLECULAR phylogeny ,BEETLES ,STAPHYLINIDAE - Abstract
Simple Summary: Lycocerus Gorham, 1889 has about 320 species worldwide at present, of which a small part have been attributed into 13 species groups, but the rest remain uncertain in their status. In the present study, five previously known species and another four new species from China and Vietnam were classified to the Lycocerusfainanus species group, based on their morphological characters. Then the distribution pattern of this group was analyzed with ArcGIS techniques. It showed that all species were constricted to the subtropical area of the Oriental region and distributed in both Taiwan and the continent. Further, the ancestral distribution range was reconstructed with the aid of the Reconstruct Ancestral State in Phylogenies (RASP) software, based on a phylogeny of morphological data. The results showed that the spatial origin was located in northern Vietnam and southwest China. Subsequently, two dispersal routes occurred: the first originated from the continent and then to Taiwan, the second from Taiwan to the continent, and the divergence between the species was caused by dispersal and vicariance. Unfortunately, it was difficult to estimate the timing of origin because of the lack of direct fossil evidence and molecular data. Five previously known species were attributed to the Lycocerus fainanus species group, including L. inopaciceps (Pic 1926), L. oberthueri (Gorham 1889), L. oudai (Švihla 2004), L. metallipennis (Fairmaire 1887), and L. nigripes (Wittmer, 1995). Four new species of this group were discovered from China and Vietnam, L. binotatus sp. nov., L. testacicollis sp. nov., L. daliensis sp. nov., and L. vietnamensis sp. nov. An updated key to all species was provided. A geographical distribution map is presented, which shows that all the members were located between 18.69041–33.93441° N, and between 98.61413–121.77102° E. The ancestral geographical range was reconstructed based on a phylogeny of morphological data by the Bayesian Binary MCMC method. The result showed that the spatial origin of L. fainanus species group was probably located in northern Vietnam and southwest China. The divergence of the species in southwest China and Taiwan was caused by vicariance about 24 Ma ago, when the latter was separated in the Qinghai-Tibet Plateau, and the remaining species of mainland China all originated from Taiwan after traveling around Southeast Asia and back to China. Nevertheless, this conclusion should be verified when fossil evidence and molecular data are available. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
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