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Microsatellites reveal fine‐scale genetic structure in stream‐living brown trout
Author(s) -
Carlsson J.,
Olsén K. H.,
Nilsson J.,
ØVerli Ø.,
Stabell O. B.
Publication year - 1999
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1999.tb02076.x
Subject(s) - brown trout , biology , salmo , microsatellite , genetic structure , tributary , trout , isolation by distance , range (aeronautics) , zoology , fish <actinopterygii> , evolutionary biology , allele , genetic distance , ecology , genetic variation , genetics , fishery , gene , materials science , cartography , composite material , geography
Multilocus F ST estimates revealed a pronounced genetic structure at six microsatellite loci in brown trout Salmo trutta in Nordre Finnvikelv, with at least three breeding units that remained stable over time. Significant differences in allele frequencies were found between five sections within a 3‐km range, even when no physical barriers prevented fish from migrating between sections. It is argued that geological structures may rise to patterns resembling isolation by distance. Seemingly, the most important factor causing genetic differentiation in Nordre Finnvikelv is genetic drift in small populations that are geologically subdivided by a tributary and by impassable waterfalls. Some correlation between previous behavioural observations and genetic structures were found.