Your browser doesn't support javascript.
loading
Rethinking the influence of hydroelectric development on gene flow in a long-lived fish, the Lake Sturgeon Acipenser fulvescens.
McDougall, Craig A; Welsh, Amy B; Gosselin, Thierry; Anderson, W Gary; Nelson, Patrick A.
Afiliação
  • McDougall CA; North/South Consultants Inc., Winnipeg, Manitoba, Canada.
  • Welsh AB; Department of Biological Sciences, University of Manitoba, Winnipeg, Canada.
  • Gosselin T; Division of Forestry and Natural Resources, West Virginia University, Morgantown, West Virginia, United States of America.
  • Anderson WG; Independent researcher, Otterburn Park, Québec, Canada.
  • Nelson PA; Department of Biological Sciences, University of Manitoba, Winnipeg, Canada.
PLoS One ; 12(3): e0174269, 2017.
Article em En | MEDLINE | ID: mdl-28329005
Many hydroelectric dams have been in place for 50 - >100 years, which for most fish species means that enough generations have passed for fragmentation induced divergence to have accumulated. However, for long-lived species such as Lake Sturgeon, Acipenser fulvescens, it should be possible to discriminate between historical population structuring and contemporary gene flow and improve the broader understanding of anthropogenic influence. On the Winnipeg River, Manitoba, two hypotheses were tested: 1) Measureable quantities of former reservoir dwelling Lake Sturgeon now reside downstream of the Slave Falls Generating Station, and 2) genetically differentiated populations of Lake Sturgeon occur upstream and downstream, a result of historical structuring. Genetic methods based on ten microsatellite markers were employed, and simulations were conducted to provide context. With regards to contemporary upstream to downstream contributions, the inclusion of length-at-age data proved informative. Both pairwise relatedness and Bayesian clustering analysis substantiated that fast-growing outliers, apparently entrained after residing in the upstream reservoir for several years, accounted for ~15% of the Lake Sturgeon 525-750 mm fork length captured downstream. With regards to historical structuring, upstream and downstream populations were found to be differentiated (FST = 0.011, and 0.013-0.014 when fast-growing outliers were excluded), and heterozygosity metrics were higher for downstream versus upstream juveniles. Historical asymmetric (downstream) gene flow in the vicinity of the generating station was the most logical explanation for the observed genetic structuring. In this section of the Winnipeg River, construction of a major dam does not appear to have fragmented a previously panmictic Lake Sturgeon population, but alterations to habitat may be influencing upstream to downstream contributions in unexpected ways.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Fluxo Gênico / Peixes Tipo de estudo: Prognostic_studies Limite: Animals País/Região como assunto: America do norte Idioma: En Revista: PLoS One Assunto da revista: CIENCIA / MEDICINA Ano de publicação: 2017 Tipo de documento: Article País de afiliação: Canadá

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Fluxo Gênico / Peixes Tipo de estudo: Prognostic_studies Limite: Animals País/Região como assunto: America do norte Idioma: En Revista: PLoS One Assunto da revista: CIENCIA / MEDICINA Ano de publicação: 2017 Tipo de documento: Article País de afiliação: Canadá