Abstract：
:A multidisciplinary study was made of brown trout Salmo trutta in the Borne River, a typical fast-flowing mountain stream in the Northern French Alps, in the geographical range of the Mediterranean lineages (ML). Information on (1) the proportion of stocked fluoro-marked fish in the angling harvest, (2) the introgression of introduced DNA microsatellite alleles into the native gene pool and (3) the demography of the population in situ in autumn revealed two contrasting populations separated by a physical barrier to upstream migration. A native S. trutta population (c. 10 000 adults) lives downstream of the barrier and is characterized by a large frequency of ML alleles (82-97%) and high densities (43-55 fish 100 m(-2)). This population is maintained predominantly by natural recruitment of juveniles (51-82%). In contrast, the upstream population is characterized by a large frequency of Atlantic lineage (AL) alleles (78-100%) and low densities (1-2 fish 100 m(-2)) and appears to be maintained by restocking (90-100%). The origins of these sharply contrasting populations appear to reflect isolation by an impassable barrier, catastrophic flooding, a downstream gradient in water quality, stocking and fishing pressure. The native downstream population has been resilient to large sudden floods and to intensive stockings of domesticated AL fish. The results of this study justify a shift in management towards conservation and rehabilitation of the native population.
journal_name
J Fish Bioljournal_title
Journal of fish biologyauthors
Caudron A,Champigneulle A,Guyomard Rdoi
10.1111/j.1095-8649.2008.02168.xsubject
Has Abstractpub_date
2009-04-01 00:00:00pages
1070-85issue
5eissn
0022-1112issn
1095-8649pii
JFB2168journal_volume
74pub_type
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