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16 results on '"LANDES, JULIE"'

6. Offspring mass variation in tree swallows : a case of bet‐hedging?

Author

Gossieaux, Philippine, Leclerc, Martin, Van de Walle, Joanie, Poisson, Yoanna, Toni, Pauline, Landes, Julie, Bourret, Audrey, Garant, Dany, Pelletier, Fanie, Bélisle, Marc, Gossieaux, Philippine, Leclerc, Martin, Van de Walle, Joanie, Poisson, Yoanna, Toni, Pauline, Landes, Julie, Bourret, Audrey, Garant, Dany, Pelletier, Fanie, and Bélisle, Marc

Abstract

The evolution of reproductive strategies is affected by the ability of organisms to deal with future environmental conditions. When environments are temporally unpredictable, however, it is difficult to anticipate optimal offspring phenotype. Diversification of offspring phenotypes, a strategy called diversified bet‐hedging, may allow parents to maximize their fitness by reducing between‐year variation in reproductive success. The link between diversification of offspring phenotypes and individual reproductive success, however, has rarely been documented empirically. We used an eight‐year dataset (1215 broods, 870 females) on individually marked tree swallows ( Tachycineta bicolor ) to assess whether intra‐brood mass variation was compatible with a diversified bet‐hedging strategy. Intra‐brood mass variation was weakly, but significantly repeatable within females, suggesting consistent individual differences. Greater intra‐brood mass variation, however, was not associated with reduced between‐year variation in reproductive success or increased female reproductive success. Moreover, contrary to diversified bet‐hedging expectations, fledging success of large broods was greater when hatchlings had similar rather than variable masses. Our results suggest that intra‐brood mass variation may not result from diversified bet‐hedging, but rather from complex interactions between environmental, brood, and maternal characteristics.

Published
2019
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10. State transitions: a major mortality risk for seasonal species

Author

Landes, Julie, Perret, Martine, Hardy, Isabelle, Camarda, Carlo Giovanni, Henry, Pierre-Yves, Pavard, Samuel, Éco-Anthropologie (EA), Muséum national d'Histoire naturelle (MNHN)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Mécanismes adaptatifs : des organismes aux communautés (MECADEV), Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS), Institut national d'études démographiques (INED), Eco-Anthropologie et Ethnobiologie (EAE), Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Université Paris Diderot - Paris 7 (UPD7), and Mécanismes Adaptatifs et Evolution (MECADEV)

Subjects
Ageing, life stages, survival analyses, seasonality, [SDV]Life Sciences [q-bio], biological rhythm, photoperiod, primate, mortality, physiological state transition
Abstract

International audience; Ageing results from the accumulation of multifactorial damage over time. However, the temporal distribution of this damage remains unknown. In seasonal species, transitions between seasons are critical periods of massive physiological remodelling. We hypothesised that these recurrent peaks of physiological remodelling are costly in terms of survival. We tested whether captive small primates exposed to an experimentally increased frequency of seasonal transitions die sooner than individuals living under natural seasonality. The results show that experiencing one additional season per year increases the mortality hazard by a factor of 3 to 4, whereas the expected number of seasons lived is only slightly impacted by the seasonal rhythm. These results demonstrate that physiological transitions between periods of high and low metabolic activity represent a major mortality risk for seasonal organisms, which has been ignored until now.

Published
2017
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13. Allochronic differentiation of a pine processionary moth population in Portugal: evolutionary scenario based on neutral markers

Author

Leblois, Raphaël, Burban, Christian, Santos, Helena, Landes, Julie, Paiva, Maria Rosa, Branco, Manuela, Kerdelhué, Carole, Centre de Biologie pour la Gestion des Populations (UMR CBGP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-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), Biodiversité, Gènes & Communautés (BioGeCo), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB), Instituto de Tecnologia Química e Biológica António Xavier (ITQB), Universidade Nova de Lisboa = NOVA University Lisbon (NOVA), Eco-Anthropologie et Ethnobiologie (EAE), Muséum national d'Histoire naturelle (MNHN)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Universidade Técnica de Lisboa, and Leblois, Raphael

Subjects
[SDV.GEN.GPO]Life Sciences [q-bio]/Genetics/Populations and Evolution [q-bio.PE], [SDV.BID.EVO]Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE], [SDV.BID.EVO] Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE], [SDV.GEN.GPO] Life Sciences [q-bio]/Genetics/Populations and Evolution [q-bio.PE], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2012

14. Evidence for low-level hybridization between two allochronic populations of the pine processionary moth, Thaumetopoea pityocampa (Lepidoptera: Notodontidae).

Author

Burban, Christian, Gautier, Mathieu, Leblois, Raphael, Landes, Julie, Santos, Helena, Paiva, Maria-Rosa, Branco, Manuela, and Kerdelhue, Carole

Subjects
EVIDENCE, PINE-moth, THAUMETOPOEA, INSECT hybridization, GENE flow, GENETIC speciation, INSECTS
Abstract

Divergence between populations sharing the same habitat can be initiated by different reproductive times, leading to allochronic differentiation. A spatially localized allochronic summer population ( SP) of the pine processionary moth Thaumetopoea pityocampa, recently discovered in Portugal, occurs in sympatry with the local winter population ( WP). We examined the level of genetic differentiation between the two populations and estimated the current gene flow within the spatial framework of their co-occurrence. Mitochondrial data indicated that the two sympatric populations were genetically closer than other WP populations. Conversely, microsatellite genotyping uncovered greater differentiation between the two sympatric populations than between allopatric ones. While male trapping confirmed that reproduction of SP and WP occurred at distinct times, clustering approaches demonstrated the presence of a few Late SP individuals emerging within the WP flight period, although genetically identified as SP. We also identified rare recent hybridization events apparently occurring mainly in the margins of the current SP range. The ongoing gene flow detected between the ancestral and the emerging allochronic populations revealed an incomplete reproductive isolation, which must therefore be taken into account and integrated with studies focussed on ecological drivers, so that a complete understanding of the ongoing speciation process might be achieved. [ABSTRACT FROM AUTHOR]

Published
2016
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15. Incipient allochronic speciation in the pine processionary moth: molecular analysis of a divergent population

Author

Landes, Julie, Burban, Christian, Gautier, Mathieu, Santos, Helena, Branco, Manuela, Leblois, Raphaël, Kerdelhué, Carole, Eco-Anthropologie et Ethnobiologie (EAE), Muséum national d'Histoire naturelle (MNHN)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Biodiversité, Gènes & Communautés (BioGeCo), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB), Centre de Biologie pour la Gestion des Populations (UMR CBGP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-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), Instituto de Tecnologia Química e Biológica António Xavier (ITQB), Universidade Nova de Lisboa = NOVA University Lisbon (NOVA), and Universidade Técnica de Lisboa

Subjects
[SDV.GEN.GPO]Life Sciences [q-bio]/Genetics/Populations and Evolution [q-bio.PE], [SDV.BID.EVO]Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

16. State transitions: a major mortality risk for seasonal species.

Author

Landes J, Perret M, Hardy I, Camarda CG, Henry PY, and Pavard S

Subjects
Aging, Animals, Mortality, Risk, Seasons, Photoperiod, Primates
Abstract

Ageing results from the accumulation of multifactorial damage over time. However, the temporal distribution of this damage remains unknown. In seasonal species, transitions between seasons are critical periods of massive physiological remodelling. We hypothesised that these recurrent peaks of physiological remodelling are costly in terms of survival. We tested whether captive small primates exposed to an experimentally increased frequency of seasonal transitions die sooner than individuals living under natural seasonality. The results show that experiencing one additional season per year increases the mortality hazard by a factor of 3 to 4, whereas the expected number of seasons lived is only slightly impacted by the seasonal rhythm. These results demonstrate that physiological transitions between periods of high and low metabolic activity represent a major mortality risk for seasonal organisms, which has been ignored until now., (© 2017 The Authors Ecology Letters published by CNRS and John Wiley & Sons Ltd.)

Published
2017
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