When Local Extinction and Colonization of River Fishes Can Be Predicted by Regional Occupancy: the Role of Spatial Scales
Identifieur interne : 000110 ( Main/Exploration ); précédent : 000109; suivant : 000111When Local Extinction and Colonization of River Fishes Can Be Predicted by Regional Occupancy: the Role of Spatial Scales
Auteurs : Benjamin Bergerot [France, Suisse] ; Bernard Hugueny [France] ; Jérôme Belliard [France]Source :
- PLoS ONE [ 1932-6203 ] ; 2013.
Abstract
Predicting which species are likely to go extinct is perhaps one of the most fundamental yet challenging tasks for conservation biologists. This is particularly relevant for freshwater ecosystems which tend to have the highest proportion of species threatened with extinction. According to metapopulation theories, local extinction and colonization rates of freshwater subpopulations can depend on the degree of regional occupancy, notably due to rescue effects. However, relationships between extinction, colonization, regional occupancy and the spatial scales at which they operate are currently poorly known.
In terms of management, we show that regional occupancy quantification allows the evaluation of local species extinction/colonization dynamics and reduction of local extinction risks for freshwater fish species implies the preservation of suitable habitats at both local and drainage basin scales.
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DOI: 10.1371/journal.pone.0084138
PubMed: 24367636
PubMed Central: 3867478
Affiliations:
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id="aff1"><addr-line>Department of Hydrosystems and Bioprocesses Research Unit, Institut national de recherche en sciences et technologies pour l’environnement et l’agriculture, Antony, France</addr-line></nlm:aff><country xml:lang="fr">France</country><wicri:regionArea>Department of Hydrosystems and Bioprocesses Research Unit, Institut national de recherche en sciences et technologies pour l’environnement et l’agriculture, Antony</wicri:regionArea></affiliation><affiliation wicri:level="1"><nlm:aff id="aff2"><addr-line>Department of Technology, Architecture and Landscape, hepia Geneva, University of Applied Sciences Western Switzerland, Jussy, Switzerland</addr-line></nlm:aff><country xml:lang="fr">Suisse</country><wicri:regionArea>Department of Technology, Architecture and Landscape, hepia Geneva, University of Applied Sciences Western Switzerland, Jussy</wicri:regionArea></affiliation></author><author><name sortKey="Hugueny, Bernard" sort="Hugueny, Bernard" uniqKey="Hugueny B" first="Bernard" last="Hugueny">Bernard Hugueny</name><affiliation wicri:level="1"><nlm:aff id="aff3"><addr-line>Department of Biologie des Organismes et Ecosystèmes Aquatiques, Muséum National d’Histoire Naturelle, Paris, France</addr-line></nlm:aff><country xml:lang="fr">France</country><wicri:regionArea>Department of Biologie des Organismes et Ecosystèmes Aquatiques, Muséum National d’Histoire Naturelle, Paris</wicri:regionArea></affiliation></author><author><name sortKey="Belliard, Jerome" sort="Belliard, Jerome" uniqKey="Belliard J" first="Jérôme" last="Belliard">Jérôme Belliard</name><affiliation wicri:level="1"><nlm:aff id="aff1"><addr-line>Department of Hydrosystems and Bioprocesses Research Unit, Institut national de recherche en sciences et technologies pour l’environnement et l’agriculture, Antony, France</addr-line></nlm:aff><country xml:lang="fr">France</country><wicri:regionArea>Department of Hydrosystems and Bioprocesses Research Unit, Institut national de recherche en sciences et technologies pour l’environnement et l’agriculture, Antony</wicri:regionArea></affiliation></author></analytic><series><title level="j">PLoS ONE</title><idno type="eISSN">1932-6203</idno><imprint><date when="2013">2013</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><sec sec-type="headed"><title>Background</title><p>Predicting which species are likely to go extinct is perhaps one of the most fundamental yet challenging tasks for conservation biologists. This is particularly relevant for freshwater ecosystems which tend to have the highest proportion of species threatened with extinction. According to metapopulation theories, local extinction and colonization rates of freshwater subpopulations can depend on the degree of regional occupancy, notably due to rescue effects. However, relationships between extinction, colonization, regional occupancy and the spatial scales at which they operate are currently poorly known. </p></sec><sec sec-type="headed"><title>Methods</title><p><bold>And Findings</bold>: We used a large dataset of freshwater fish annual censuses in 325 stream reaches to analyse how annual extinction/colonization rates of subpopulations depend on the regional occupancy of species. For this purpose, we modelled the regional occupancy of 34 fish species over the whole French river network and we tested how extinction/colonization rates could be predicted by regional occupancy described at five nested spatial scales. Results show that extinction and colonization rates depend on regional occupancy, revealing existence a rescue effect. We also find that these effects are scale dependent and their absolute contribution to colonization and extinction tends to decrease from river section to larger basin scales. </p></sec><sec sec-type="headed"><title>Conclusions</title><p>In terms of management, we show that regional occupancy quantification allows the evaluation of local species extinction/colonization dynamics and reduction of local extinction risks for freshwater fish species implies the preservation of suitable habitats at both local and drainage basin scales.</p></sec></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Hanski, I" uniqKey="Hanski I">I Hanski</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Levins, R" uniqKey="Levins R">R Levins</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Gotelli, Nj" uniqKey="Gotelli N">NJ Gotelli</name></author><author><name sortKey="Kelley, Wg" 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