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Spatial graphs highlight how multi‐generational dispersal shapes landscape genetic patterns ArchiMer
Boulanger, Emilie; Dalongeville, Alicia; Andrello, Marco; Mouillot, David; Manel, Stéphanie.
Current approaches that compare spatial genetic structure of a given species and the dispersal of its mobile phase can detect a mismatch between both patterns mainly due to processes acting at different temporal scales. Genetic structure result from gene flow and other evolutionary and demographic processes over many generations, while dispersal predicted from the mobile phase often represents solely one generation on a single time‐step. In this study, we present a spatial graph approach to landscape genetics that extends connectivity networks with a stepping‐stone model to represent dispersal between suitable habitat patches over multiple generations. We illustrate the approach with the case of the striped red mullet Mullus surmuletus in the Mediterranean...
Tipo: Text Palavras-chave: Genetic connectivity; Mediterranean Sea; Mullus surmuletus; Seascape genetics; Spatial graphs; Stepping-stone dispersal.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00630/74166/73779.pdf
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Environmental DNA metabarcoding reveals and unpacks a biodiversity conservation paradox in Mediterranean marine reserves ArchiMer
Boulanger, Emilie; Loiseau, Nicolas; Valentini, Alice; Arnal, Véronique; Boissery, Pierre; Dejean, Tony; Deter, Julie; Guellati, Nacim; Holon, Florian; Juhel, Jean-baptiste; Lenfant, Philippe; Manel, Stéphanie; Mouillot, David.
Although we are currently experiencing worldwide biodiversity loss, local species richness does not always decline under anthropogenic pressure. This conservation paradox may also apply in protected areas but has not yet received conclusive evidence in marine ecosystems. Here, we survey fish assemblages in six Mediterranean no-take reserves and their adjacent fishing grounds using environmental DNA (eDNA) while controlling for environmental conditions. We detect less fish species in marine reserves than in nearby fished areas. The paradoxical gradient in species richness is accompanied by a marked change in fish species composition under different managements. This dissimilarity is mainly driven by species that are often overlooked by classical visual...
Tipo: Text Palavras-chave: Environmental DNA metabarcoding; Marine reserves; Alpha and beta diversity.
Ano: 2021 URL: https://archimer.ifremer.fr/doc/00692/80374/83491.pdf
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