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  • 1
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    Online Resource
    Interpopulation differences in male reproductive effort drive the population dynamics of a host exposed to an emerging fungal pathogen
    Wiley ; 2022
    In:  Journal of Animal Ecology Vol. 91, No. 2 ( 2022-02), p. 308-319
    Details
    In: Journal of Animal Ecology, Wiley, Vol. 91, No. 2 ( 2022-02), p. 308-319
    Abstract: Compensatory recruitment is a key demographic mechanism that has allowed the coexistence of populations of susceptible amphibians with Batrachochytrium dendrobatidis (Bd), a fungus causing one of the most devastating emerging infectious disease ever recorded among vertebrates. However, the underlying processes (e.g. density‐dependent increase in survival at early life stages, change in reproductive traits) as well as the level of interpopulation variation in this response are poorly known. We explore potential mechanisms of compensatory recruitment in response to Bd infection by taking advantage of an amphibian system where male reproductive traits are easy to quantify in free‐living populations. The Southern Darwin's frog Rhinoderma darwinii is a vocal sac‐brooding species that exhibits a high susceptibility to lethal Bd infection. Using a 7‐year capture–recapture study at four populations with contrasting Bd infection status (one high prevalence, one low prevalence and two Bd‐free populations), we evaluated whether Bd‐positive populations exhibited a higher adult recruitment and a higher male reproductive effort than Bd‐negative populations. We also estimated population growth rates to explore whether recruitment compensated for the negative impacts of Bd on the survival of adults. In addition, we evaluated a potential demographic signal of compensatory recruitment (i.e. positive relationship between the proportion of juveniles and Bd prevalence) in response to Bd infection using raw count data from 13 R. darwinii populations. The high Bd prevalence population exhibited the highest male reproductive effort and the highest recruitment among the four monitored populations. This led to a growing population during the study period despite high mortality of adult hosts. In contrast, males from the population with low Bd prevalence had a low reproductive effort and this population, which had the lowest adult recruitment, was declining during the study period despite adults having a higher survival in comparison to the high Bd prevalence population. We also found a demographic signal of compensatory recruitment in response to Bd infection in our broader analysis of 13 R. darwinii populations. Our study underlines the importance of interpopulation variation in life‐history strategies on the fate of host populations after infectious disease emergence. Our results also suggest that an increase in reproductive effort can be one of the processes underlying compensatory recruitment in populations of Bd‐susceptible amphibians.
    Type of Medium: Online Resource
    ISSN: 0021-8790 , 1365-2656
    URL: Issue
    URL: Article
    DOI: 10.1111/jane.v91.2
    DOI: 10.1111/1365-2656.13603
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 2006616-8
    SSG: 12
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  • 2
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    Multi-event models reveal the absence of interaction between an invasive frog and a native endangered amphibian
    Springer Science and Business Media LLC ; 2013
    In:  Biological Invasions Vol. 15, No. 9 ( 2013-9), p. 2001-2012
    Details
    In: Biological Invasions, Springer Science and Business Media LLC, Vol. 15, No. 9 ( 2013-9), p. 2001-2012
    Type of Medium: Online Resource
    ISSN: 1387-3547 , 1573-1464
    URL: Article
    DOI: 10.1007/s10530-013-0427-x
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2013
    detail.hit.zdb_id: 2014991-8
    SSG: 12
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  • 3
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    Thermal adaptation rather than demographic history drives genetic structure inferred by copy number variants in a marine fish
    Wiley ; 2021
    In:  Molecular Ecology Vol. 30, No. 7 ( 2021-04), p. 1624-1641
    Details
    In: Molecular Ecology, Wiley, Vol. 30, No. 7 ( 2021-04), p. 1624-1641
    Abstract: Increasing evidence shows that structural variants represent an overlooked aspect of genetic variation with consequential evolutionary roles. Among those, copy number variants (CNVs), including duplicated genomic regions and transposable elements (TEs), may contribute to local adaptation and/or reproductive isolation among divergent populations. Those mechanisms suppose that CNVs could be used to infer neutral and/or adaptive population genetic structure, whose study has been restricted to microsatellites, mitochondrial DNA and Amplified fragment length polymorphism markers in the past and more recently the use of single nucleotide polymorphisms (SNPs). Taking advantage of recent developments allowing CNV analysis from RAD‐seq data, we investigated how variation in fitness‐related traits, local environmental conditions and demographic history are associated with CNVs, and how subsequent copy number variation drives population genetic structure in a marine fish, the capelin ( Mallotus villosus ). We collected 1538 DNA samples from 35 sampling sites in the north Atlantic Ocean and identified 6620 putative CNVs. We found associations between CNVs and the gonadosomatic index, suggesting that six duplicated regions could affect female fitness by modulating oocyte production. We also detected 105 CNV candidates associated with water temperature, among which 20% corresponded to genomic regions located within the sequence of protein‐coding genes, suggesting local adaptation to cold water by means of gene sequence amplification. We also identified 175 CNVs associated with the divergence of three previously defined parapatric glacial lineages, of which 24% were located within protein‐coding genes, making those loci potential candidates for reproductive isolation. Lastly, our analyses unveiled a hierarchical, complex CNV population structure determined by temperature and local geography, which was in stark contrast to that inferred based on SNPs in a previous study. Our findings underline the complementarity of those two types of genomic variation in population genomics studies.
    Type of Medium: Online Resource
    ISSN: 0962-1083 , 1365-294X
    URL: Issue
    URL: Article
    DOI: 10.1111/mec.v30.7
    DOI: 10.1111/mec.15835
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2021
    detail.hit.zdb_id: 2020749-9
    detail.hit.zdb_id: 1126687-9
    SSG: 12
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  • 4
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    Shared ancestral polymorphisms and chromosomal rearrangements as potential drivers of local adaptation in a marine fish
    Wiley ; 2020
    In:  Molecular Ecology Vol. 29, No. 13 ( 2020-07), p. 2379-2398
    Details
    In: Molecular Ecology, Wiley, Vol. 29, No. 13 ( 2020-07), p. 2379-2398
    Abstract: Gene flow has tremendous importance for local adaptation, by influencing the fate of de novo mutations, maintaining standing genetic variation and driving adaptive introgression. Furthermore, structural variation as chromosomal rearrangements may facilitate adaptation despite high gene flow. However, our understanding of the evolutionary mechanisms impending or favouring local adaptation in the presence of gene flow is still limited to a restricted number of study systems. In this study, we examined how demographic history, shared ancestral polymorphism, and gene flow among glacial lineages contribute to local adaptation to sea conditions in a marine fish, the capelin ( Mallotus villosus ). We first assembled a 490‐Mbp draft genome of M. villosus to map our RAD sequence reads. Then, we used a large data set of genome‐wide single nucleotide polymorphisms (25,904 filtered SNPs) genotyped in 1,310 individuals collected from 31 spawning sites in the northwest Atlantic. We reconstructed the history of divergence among three glacial lineages and showed that they probably diverged from 3.8 to 1.8 million years ago and experienced secondary contacts. Within each lineage, our analyses provided evidence for large N e and high gene flow among spawning sites. Within the Northwest Atlantic lineage, we detected a polymorphic chromosomal rearrangement leading to the occurrence of three haplogroups. Genotype–environment associations revealed molecular signatures of local adaptation to environmental conditions prevailing at spawning sites. Our study also suggests that both shared polymorphisms among lineages, resulting from standing genetic variation or introgression, and chromosomal rearrangements may contribute to local adaptation in the presence of high gene flow.
    Type of Medium: Online Resource
    ISSN: 0962-1083 , 1365-294X
    URL: Issue
    URL: Article
    DOI: 10.1111/mec.v29.13
    DOI: 10.1111/mec.15499
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 2020749-9
    detail.hit.zdb_id: 1126687-9
    SSG: 12
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  • 5
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    Analysing movement behaviour and dynamic space‐use strategies among habitats using multi‐event capture‐recapture modelling
    Wiley ; 2017
    In:  Methods in Ecology and Evolution Vol. 8, No. 9 ( 2017-09), p. 1124-1132
    Details
    In: Methods in Ecology and Evolution, Wiley, Vol. 8, No. 9 ( 2017-09), p. 1124-1132
    Abstract: The environment of most species is heterogeneous at different spatial and temporal scales; this heterogeneity can have a direct effect on various components of fitness. As a consequence, individual space‐use and movement strategies are central issues in ecology and conservation and receive considerable attention from researchers. In the last 30 years, this issue has led to the development of capture–recapture models that allow movement between sites to be quantified, while handling imperfect detection. For studies involving numerous recapture sites in which the emphasis is on dispersal or migration rather than movement between particular sites, Lagrange et al . recently proposed a parsimonious CR multi‐event model that contrasts individuals that move and individuals that stay in place, irrespective of the sites involved. In this study, we developed a generalized version of this model to allow survival probability and movement probability to differ for different types of habitat to which the individual sites may be assigned. We investigated the potential of this new parameterization by studying the movements of an amphibian, the yellow‐bellied toad ( Bombina variegata ), in a set of breeding and resting/foraging ponds. Our capture–recapture multi‐event model provides a highly flexible tool allowing users to model movements within and between several habitats. This approach can be potentially used to study movement behaviour and space‐use strategies of a wide range of taxa.
    Type of Medium: Online Resource
    ISSN: 2041-210X , 2041-210X
    URL: Issue
    URL: Article
    DOI: 10.1111/mee3.2017.8.issue-9
    DOI: 10.1111/2041-210X.12717
    Language: English
    Publisher: Wiley
    Publication Date: 2017
    detail.hit.zdb_id: 2528492-7
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  • 6
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    Transport infrastructure severely impacts amphibian dispersal regardless of life stage
    Springer Science and Business Media LLC ; 2019
    In:  Scientific Reports Vol. 9, No. 1 ( 2019-06-03)
    Details
    In: Scientific Reports, Springer Science and Business Media LLC, Vol. 9, No. 1 ( 2019-06-03)
    Abstract: Transport infrastructure such as roads has been reported to negatively affect dispersal. Their effects on dispersal are thought to be complex, depending on the characteristics of the structure and the intensity of the traffic using it. In addition, individual factors, such as age, may strongly affect dispersal decisions and success when individuals are confronted with transport infrastructure. Despite the importance of this topic for wildlife conservation, few studies have investigated the effect of transport infrastructure on individuals’ dispersal decisions before and after sexual maturity. We examined the effects on two kinds of infrastructure, gravel tracks and paved roads, on the dispersal of an endangered amphibian, the yellow-bellied toad ( Bombina variegata ). We used capture–recapture data collected during a five-year period on a large, spatially structured population of B . variegata . Our study revealed that emigration rates increased with an individual’s age, while dispersal distance decreased. It also showed that both tracks and roads had negative effects on immigration. The negative effect of roads was stronger than that of tracks. We additionally found that the effect of tracks on dispersal slightly decreased with a toad’s age. In contrast, the negative effect of roads was severe and relatively similar across age classes.
    Type of Medium: Online Resource
    ISSN: 2045-2322
    URL: Article
    DOI: 10.1038/s41598-019-44706-1
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2019
    detail.hit.zdb_id: 2615211-3
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  • 7
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    Online Resource
    To breed or not to breed: past reproductive status and environmental cues drive current breeding decisions in a long-lived amphibian
    Springer Science and Business Media LLC ; 2014
    In:  Oecologia Vol. 176, No. 1 ( 2014-9), p. 107-116
    Details
    In: Oecologia, Springer Science and Business Media LLC, Vol. 176, No. 1 ( 2014-9), p. 107-116
    Type of Medium: Online Resource
    ISSN: 0029-8549 , 1432-1939
    URL: Article
    DOI: 10.1007/s00442-014-3003-x
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2014
    detail.hit.zdb_id: 1462019-4
    detail.hit.zdb_id: 123369-5
    SSG: 12
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  • 8
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    Population position along the fast–slow life‐history continuum predicts intraspecific variation in actuarial senescence
    Wiley ; 2020
    In:  Journal of Animal Ecology Vol. 89, No. 4 ( 2020-04), p. 1069-1079
    Details
    In: Journal of Animal Ecology, Wiley, Vol. 89, No. 4 ( 2020-04), p. 1069-1079
    Abstract: Patterns of actuarial senescence can be highly variable among species. Previous comparative analyses revealed that both age at the onset of senescence and rates of senescence are linked to position of a species along the fast–slow life‐history continuum. As there are few long‐term datasets of wild populations with known‐age individuals, intraspecific (i.e. between‐population) variation in senescence is understudied and limited to comparisons of wild and captive populations of the same species, mostly birds and mammals. In this paper, we examined how population position along the fast–slow life‐history continuum affects intraspecific variation in senescence in an amphibian, Bombina variegata . We used capture–recapture data collected in four populations with contrasting life‐history strategies. Senescence trajectories were analysed using Bayesian capture–recapture models. We show that in populations with fast life histories the onset of actuarial senescence was earlier and individuals aged at a faster rate than individuals in populations with slow life histories. Our study provides one of the few empirical examples of among‐population variation in actuarial senescence patterns in the wild and confirms that the fast–slow life‐history gradient is associated with both macroevolutionary and microevolutionary patterns of actuarial senescence.
    Type of Medium: Online Resource
    ISSN: 0021-8790 , 1365-2656
    URL: Issue
    URL: Article
    DOI: 10.1111/jane.v89.4
    DOI: 10.1111/1365-2656.13172
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 2006616-8
    SSG: 12
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  • 9
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    Demographic responses to weather fluctuations are context dependent in a long‐lived amphibian
    Wiley ; 2016
    In:  Global Change Biology Vol. 22, No. 8 ( 2016-08), p. 2676-2687
    Details
    In: Global Change Biology, Wiley, Vol. 22, No. 8 ( 2016-08), p. 2676-2687
    Abstract: Weather fluctuations have been demonstrated to affect demographic traits in many species. In long‐lived organisms, their impact on adult survival might be buffered by the evolution of traits that reduce variation in interannual adult survival. For example, skipping breeding is an effective behavioral mechanism that may limit yearly variation in adult survival when harsh weather conditions occur; however, this in turn would likely lead to strong variation in recruitment. Yet, only a few studies to date have examined the impact of weather variation on survival, recruitment and breeding probability simultaneously in different populations of the same species. To fill this gap, we studied the impact of spring temperatures and spring rainfall on survival, on reproductive skipping behavior and on recruitment in five populations of a long‐lived amphibian, the yellow‐bellied toad ( Bombina variegata ). Based on capture–recapture data, our findings demonstrate that survival depends on interactions between age, population and weather variation. Varying weather conditions in the spring result in strong variation in the survival of immature toads, whereas they have little effect on adult toads. Breeding probability depends on both the individual's previous reproductive status and on the weather conditions during the current breeding season, leading to high interannual variation in recruitment. Crucially, we found that the impact of weather variation on demographic traits is largely context dependent and may thus differ sharply between populations. Our results suggest that studies predicting the impact of climate change on population dynamics should be taken with caution when the relationship between climate and demographic traits is established using only one population or few populations. We therefore highly recommend further research that includes surveys replicated in a substantial number of populations to account for context‐dependent variation in demographic processes.
    Type of Medium: Online Resource
    ISSN: 1354-1013 , 1365-2486
    URL: Issue
    URL: Article
    DOI: 10.1111/gcb.2016.22.issue-8
    DOI: 10.1111/gcb.13290
    Language: English
    Publisher: Wiley
    Publication Date: 2016
    detail.hit.zdb_id: 2020313-5
    SSG: 12
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  • 10
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    Slow life history and rapid extreme flood: demographic mechanisms and their consequences on population viability in a threatened amphibian
    Wiley ; 2015
    In:  Freshwater Biology Vol. 60, No. 11 ( 2015-11), p. 2349-2361
    Details
    In: Freshwater Biology, Wiley, Vol. 60, No. 11 ( 2015-11), p. 2349-2361
    Abstract: In the Northern Hemisphere, an increase in both the frequency and magnitude of violent flooding events has been reported due to climate change. According to life history theory, one might postulate that in ‘slow’ species: (i) environmental canalisation may act as a selective force that minimises to some extent adult survival variations caused by catastrophic flood and (ii) extreme flooding events would cause important variations in recruitment and young survival. Hence, it may be hypothesised that (iii) the population growth rate of ‘slow’ species might be relatively insensitive to changes in the frequency of extreme climatic events if adult survival remains largely unaffected. In this study, we investigated how extreme rainfall events resulting in severe flood impact population dynamics of a long‐lived endangered amphibian, the yellow‐bellied toad ( Bombina variegata : Bombinatoridae). To address this issue, we used capture–recapture ( CR ) data collected on two populations (768 and 1154 individuals identified) in southern France and developed multi‐event CR models. Our results indicated that extreme flooding did not cause any variation in sub‐adult or adult survival, whereas recruitment and juvenile survival were negatively impacted. Furthermore, our simulations indicated that the population growth rate was only marginally sensitive to potential changes in the frequency of extreme flooding in the future. Hence, we suggest that extreme flooding does not appear to be a proximal factor of extinction risk for this endangered amphibian species.
    Type of Medium: Online Resource
    ISSN: 0046-5070 , 1365-2427
    URL: Issue
    URL: Article
    DOI: 10.1111/fwb.2015.60.issue-11
    DOI: 10.1111/fwb.12661
    Language: English
    Publisher: Wiley
    Publication Date: 2015
    detail.hit.zdb_id: 2020306-8
    detail.hit.zdb_id: 121180-8
    SSG: 12
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