NDLI: Evidence of two contrasting brown trout Salmo trutta populations spatially separated in the River Borne (France) and shift in management towards conservation of the native lineage.

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Evidence of two contrasting brown trout Salmo trutta populations spatially separated in the River Borne (France) and shift in management towards conservation of the native lineage.

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Year: 2009 Volume: 74 Issue: 4

Year: 2009 Volume: 74 Issue: 3

Year: 2009 Volume: 74 Issue: 2

Year: 2009 Volume: 74 Issue: 1

Year: 2008 Volume: 73

Evidence of two contrasting brown trout Salmo trutta populations spatially separated in the River Borne (France) and shift in management towards conservation of the native lineage.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Caudron, A. Champigneulle, A. Guyomard, R.
Spatial Coverage	France
Description	Country affiliation: France Author Affiliation: Caudron A ( Fédération de Haute-Savoie pour la Pêche et la Protection du Milieu Aquatique, Le Villaret, 2092 route des Diacquenods, 74370 St Martin Bellevue, France. a.caudron@wanadoo.fr)
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.
File Format	HTM / HTML
ISSN	00221112
Issue Number	5
Volume Number	74
e-ISSN	10958649
Journal	Journal of Fish Biology
Language	English
Publisher	Wiley-Blackwell
Publisher Date	2009-04-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Genetics, Population Dna, Mitochondrial Discipline Ichthyology Trout Gene Frequency Rivers Journal Article Genetic Variation Animals Alleles Genetics Animal Migration France Microsatellite Repeats Conservation Of Natural Resources
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Ecology, Evolution, Behavior and Systematics

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Evidence of two contrasting brown trout Salmo trutta populations spatially separated in the River Borne (France) and shift in management towards conservation of the native lineage.

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