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Disentangling individual movement between populations from effective dispersal in the facultative anadromous Salmo trutta L.
Author(s) -
Masson Séverine,
Lepais Olivier,
Manicki Aurélie,
Prévost Etienne,
Chat Joelle
Publication year - 2018
Publication title -
ecology of freshwater fish
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 55
eISSN - 1600-0633
pISSN - 0906-6691
DOI - 10.1111/eff.12349
Subject(s) - fish migration , biological dispersal , salmo , facultative , brown trout , ecology , trout , gene flow , fishery , biology , population , marine species , habitat , geography , fish <actinopterygii> , genetic variation , gene , biochemistry , demography , sociology
Gathering information on both individual movement and gene flow is rarely possible when studying dispersal among populations in fish species. It is, however, possible to assess both at a reasonable cost in Salmo trutta L. on the Atlantic coast of Europe where the facultative anadromous species is composed of discrete populations of brown trout residents occupying distinct river systems, but exchanging phenotypically distinguishable sea trout migrants. We performed two kinds of genetic analyses using individual microsatellite genotypes: the stock identification of sea trout entering each corridor and the estimates of effective dispersal through each corridor. We observed that individual movement (nonlocal individuals of each source population ranging from 4% to 35% of the sea trout run) never translates into effective dispersal except in one of four migratory corridors examined. The likely origin of this uniquely detected gene flow event is discussed in the light of well‐documented migratory fish management actions undertaken in the past in the studied area.