@article{fdi:010079673,
  title = {{I}mportance of metapopulation dynamics to explain fish persistence in a river system},
  author = {{B}ellard, {C}. and {H}ugueny, {B}ernard},
  editor = {},
  language = {{ENG}},
  abstract = {{H}abitat modification and fragmentation are key factors responsible for fish population decline worldwide. {P}revious assessments documented a total of 72 species extinctions for the sole class of {A}ctinopterygii. {H}owever, global extinctions are difficult to monitor or study based on fossil records. {B}y contrast, local extinctions occurring at the population level are easier to study. {G}iven this context, an important question relates to whether extinction dynamics studied at the local scale can provide useful information to understand extinctions occurring at larger scales. {T}his would be the case if local extinctions were not balanced by recolonisation as in a classic metapopulation. {O}ur aim is thus to explain the observed regional (per basin) persistence of 252 fish populations by testing contribution of local extinction rates and more generally metapopulation dynamics components. {T}o address this aim, we used the annual extinction probability of 252 regional populations of up to 14 species inhabiting 18 coastal rivers, which became isolatedc. 8,500 years ago. {W}e specifically compared extinction probabilities obtained by seven theoretical models to investigate whether regional extinction rates (i.e. loss from a river system) were correlated to local extinction rates (i.e. loss from an occupied site) and the role of metapopulation dynamics to explain regional persistence. {U}sing empirical data, we showed the importance of variables related to metapopulation dynamics to explain extinction rates across the 18 river systems. {A}s expected, the regional extinction rate decreased with the colonisation rate, area, metapopulation size, and percentage of occupied localities. {B}y contrast, an inconsistent relationship emerged between regional and local extinction rates, as species with high local extinction rates were not particularly prone to regional extinction. {O}ur results provide strong support for the contribution of colonisation rates to explain persistence. {O}verall, our results show that the equilibrium number of occupied localities could be a good predictor of the long-term persistence of metapopulations in rivers. {F}inally, our results suggest the importance of connectivity to maintain sustainable populations within the river system.},
  keywords = {colonisation ; connectivity ; extinction ; fragmentation ; percentage ; occurrence ; {FRANCE} ; {MANCHE} ; {SEINE} ; {SOMME}},
  booktitle = {},
  journal = {{F}reshwater {B}iology},
  volume = {65},
  numero = {11},
  pages = {1858--1869},
  ISSN = {0046-5070},
  year = {2020},
  DOI = {10.1111/fwb.13571},
  URL = {https://www.documentation.ird.fr/hor/fdi:010079673},
}