Invasive species and postglacial colonization: Their effects on the genetic diversity of a Patagonian fish

Iván Vera-Escalona, Evelyn Habit, Daniel E. Ruzzante

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16 Citas (Scopus)

Resumen

The present distribution of Patagonian species is the result of a complex history involving Quaternary refugial populations, Holocene range expansions and demographic changes occurring during the Anthropocene. Invasive salmonids were introduced in Patagonia during the last century, occupying most rivers and lakes, preying on and competing with native species, including the fish Galaxias platei. Here, we used G. platei as a case study to understand how long-term (i.e. population differentiation during the Holocene) and short-term historical processes (salmonid introductions) affect genetic diversity. Using a suite of microsatellite markers, we found that the number of alleles is negatively correlated with the presence of salmonids (short-term processes), with G. platei populations from lakes with salmonids exhibiting significantly lower genetic diversity than populations from lakes without salmonids. Simulations (100 years backwards) showed that this difference in genetic diversity can be explained by a 99% reduction in population size. Allelic richness and observed heterozygosities were also negatively correlated with the presence of salmonids, but also positively correlated with long-term processes linked to Quaternary glaciations. Our results show how different genetic parameters can help identify processes taking place at different scales and their importance in terms of conservation.

Idioma originalEnglish
Número de artículo20182567
PublicaciónProceedings of the Royal Society B: Biological Sciences
Volumen286
N.º1897
DOI
EstadoPublished - feb. 27 2019

Nota bibliográfica

Funding Information:
I.V.-E. was supported by Becas Chile Folio 72100509 (CONI-CYT) and the Dr Patrick Lett Fund (Dalhousie University). Funding for this study was provided by an NSERC Discovery Grant and the Killam Trust to D.E.R. Financial support for fieldwork was provided by grants from the Committee for Research and Exploration of the National Geographical Society (grant nos 6799-00, 8168-07 and 9247-13) to D.E.R and FONDECYT (Chile) grant 1080082, and Proyecto VRID UdeC, 213.310.063-1AP to E.H.

Publisher Copyright:
© 2019 The Author(s) Published by the Royal Society. All rights reserved.

ASJC Scopus Subject Areas

  • General Immunology and Microbiology
  • General Biochemistry,Genetics and Molecular Biology
  • General Environmental Science
  • General Agricultural and Biological Sciences

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