Situation Des Poissons Migrateurs Amphihalins Sur Le Bassin De L'adour.

Marty, André; Bousquet, Bernard

doi:10.1051/kmae/2001054

Cited by 2 publications

(2 citation statements)

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“…The discovery of adult fish originating from the Pau River has important implications for understanding the population dynamics of Atlantic salmon. Previous work suggested the Pau River was a marginal nursery habitat for Atlantic salmon, acting as a potential "sink" for the adult population (Marty and Bousquet 2001). Because of several dams, the Pau River has normally limited accessibility to Atlantic salmon (spawning areas in upper sections of the river).…”

Section: Determination Of Adult Natal Streamsmentioning

confidence: 99%

“…Despite decades of intensive restocking programs, natural spawning in those rivers was marginal because during the three sampling years, we found one wild juvenile in the Ouzom River and only four wild juveniles out of 44 individuals in the Pau River. Because of several dams, the Pau watershed is usually limited in its accessibility to Atlantic salmon (spawning areas in upper sections of the river; Marty and Bousquet 2001).…”

Section: Hatchery Vs Wildmentioning

confidence: 99%

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Persistence of a southern Atlantic salmon population: diversity of natal origins from otolith elemental and Sr isotopic signatures

Martin

Bareille

Bérail

et al. 2013

Can. J. Fish. Aquat. Sci.

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We investigated the use of Sr:Ca, Ba:Ca, and 87 Sr: 86 Sr ratios as natural tags for determining the natal origins of juvenile and adult Atlantic salmon (Salmo salar) from 12 tributaries in the Adour basin (southwestern France) and estimated homing on a tributary scale. Geochemical signatures from core regions of the otolith were also used to identify fish from hatchery or naturally spawned sources. Quadratic discriminant function analysis (QDFA) was on average 80% successful at classifying juveniles according to their natal rivers. Adults of unknown natal origin were assigned to their natal rivers using the juvenile fingerprints from QDFA approach. Only 18 adults originated from streams not included in the juvenile database. Although most of the adults showed a marked homing instinct, homing was not perfect, and some wild fish strayed into non-natal spawning areas. Returns of hatchery-reared fish as adult spawners represented 10% of the total sampled fish. Allocation of fish to natal tributaries or hatcheries illustrated the abundance and relative contributions of natal sources, important for the recovery of Atlantic salmon in this area.Résumé : Nous nous sommes penchés sur l'utilisation des rapports Sr:Ca, Ba:Ca et 87 Sr: 86 Sr comme marqueurs naturels des origines natales de saumons atlantiques juvéniles et adultes provenant de 12 affluents du bassin de l'Adour (sud-ouest de la France) et avons estimé le retour à l'échelle des affluents. Les signatures géochimiques des régions centrales d'otolithes ont également été utilisées pour distinguer les poissons issus d'écloseries de ceux issus du frai en milieu naturel. Le taux de succès moyen de l'analyse discriminante quadratique (QDFA) pour ce qui est de classer les juvéniles selon leurs rivières natales était de 80 %. La détermination de la rivière natale des adultes d'origine natale inconnue reposait sur les empreintes de juvéniles tirées de la QDFA. Seuls 18 adultes provenaient de cours d'eau ne figurant pas dans la base de données des juvéniles. Bien que la plupart des adultes présentaient un instinct de retour marqué, le retour n'était pas parfait, certains poissons sauvages se retrouvant dans des régions de frai non natales. Les poissons élevés en écloserie retournant comme géniteurs adultes représentaient 10 % du total des poissons échantillonnés. La répartition des poissons entre affluents natals et écloseries illustre l'abondance et les contributions relatives des sources natales, qui jouent un rôle important dans le rétablissement du saumon atlantique dans la région. [Traduit par la Rédaction]

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Section: Determination Of Adult Natal Streamsmentioning

confidence: 99%

Section: Hatchery Vs Wildmentioning

confidence: 99%

Persistence of a southern Atlantic salmon population: diversity of natal origins from otolith elemental and Sr isotopic signatures

Martin

Bareille

Bérail

et al. 2013

Can. J. Fish. Aquat. Sci.

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Origins and genetic diversity among Atlantic salmon recolonizing upstream areas of a large South European river following restoration of connectivity and stocking

et al. 2014

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The restoration and maintenance of habitat connectivity are major challenges in conservation biology. These aims are especially critical for migratory species using corridors that can be obstructed by anthropogenic barriers. Here, we explored the origins and genetic diversity of Atlantic salmon (Salmo salar) recolonizing upstream areas of the largest South European Atlantic salmon population (Adour drainage, France) following restoration of connectivity and stocking. We genotyped 1,009 juvenile individuals, sampled either in continuously inhabited downstream sites or in recently reconnected and recolonized upstream locations, at 12 microsatellite loci. We found significant fine scale genetic structure, with three main genetic clusters corresponding to the Nive, Nivelle and Gaves rivers. Within each of these clusters, samples collected in continuously inhabited and recently recolonized sites had comparable allelic richness and effective population sizes and were only weakly differentiated. Genetic structure among basins was also similar among continuously inhabited and recently recolonized sites. The majority of the individuals sampled from recently recolonized sites were assigned to neighboring continuously inhabited downstream sites, but noticeable proportions of fish were assigned to samples collected in more distant sites or identified as putative hybrids. Overall, this study suggests that the restoration of accessibility to upstream areas can allow for the recolonization and effective reproduction of Atlantic salmon from proximate downstream refugia, which does not decrease local diversity or disrupt existing genetic structure. (Résumé d'auteur

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Situation Des Poissons Migrateurs Amphihalins Sur Le Bassin De L'adour.

Cited by 2 publications

References 0 publications

Persistence of a southern Atlantic salmon population: diversity of natal origins from otolith elemental and Sr isotopic signatures

Persistence of a southern Atlantic salmon population: diversity of natal origins from otolith elemental and Sr isotopic signatures

Origins and genetic diversity among Atlantic salmon recolonizing upstream areas of a large South European river following restoration of connectivity and stocking

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