Assessment of three strategies practiced by fishery managers for restoring native brown trout (<i>Salmo trutta</i>) populations in Northern French Alpine Streams

Caudron, Arnaud; Champigneulle, Alexis; Guyomard, René; Largiadèr, Carlo R.

doi:10.1111/j.1600-0633.2010.00458.x

Cited by 22 publications

(15 citation statements)

References 73 publications

(127 reference statements)

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“…Fig. Three other studies performed on streams in the Rhô ne drainage area, and using genetic refuge policies for 5 and 13 years, gave similar results (Caudron et al, 2011a;Caudron & Champigneulle, 2011;C. stocked trout and trout from natural recruitment) and otolith-unstained angler's catches (i.e.…”

Section: Genetic Refuges: a Mitigated Conservation Strategysupporting

confidence: 59%

Early effects of the strategies of creating a genetic refuge and direct translocation for conserving and restoring populations of native brown trout

Caudron¹,

Champigneulle²,

Vigier³

et al. 2012

Freshwater Biology

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Summary 1. The conservation of salmonid inter‐ and intra‐specific diversity is a well‐known challenge, and general management guidelines and conservation processes are available. However, research demonstrating the outcomes of practical conservation actions is largely lacking. 2. We monitored the spatiotemporal genetic and demographic evolution of a native Mediterranean brown trout population in a river in the French Alps to assess the efficacy and early effects of genetic refuge (i.e. cessation of stocking) and wild trout translocation strategies. We also studied the use of angling as a tool to limit the introgression of the wild standing population. 3. We found that the rate of non‐native alleles in wild populations was age dependent, underpinning the importance of using age profiles in the design of genetic conservation studies. 4. Genetic refuge and direct translocation of wild trout resulted in a rapid and significant decrease in the percentages of non‐native alleles. Moreover, the genetic refuge strategy resulted in a significant reduction in the number of pure non‐native individuals, without changing trout densities, whilst direct translocations resulted in the establishment of dense, self‐sustaining native trout populations. Direct translocations changed the distribution of genotype categories and increased densities up to 55‐fold in 3 years. Our results also showed that angling resulted in a selective pressure on non‐native trout introduced at fry stage, whereas non‐native trout issued from natural recruitment were not affected. 5. Our study provides insights for improving the efficacy of practical conservation policies and can be used in other native freshwater fish conservation plans. Proactive measures such as direct translocation need to be implemented together with passive approaches such as genetic refuge policies. Before implementing such actions, accurate genetic and demographic studies at small geographical scales are essential to ensure that no self‐sustaining population of non‐native fish is present. To obtain rapid colonisation, we recommend introducing fish along whole river sections rather than concentrating on a few river stretches. Angling pressure can be used as an additional tool to improve restoration.

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Section: Genetic Refuges: a Mitigated Conservation Strategysupporting

confidence: 59%

Early effects of the strategies of creating a genetic refuge and direct translocation for conserving and restoring populations of native brown trout

Caudron¹,

Champigneulle²,

Vigier³

et al. 2012

Freshwater Biology

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“…Particularly, S. coruhensis (Turan et al 2009) is endemic and only distributed in the waters of Eastern Black Sea Region. These populations are confronted with a medium-term risk of extinction (Caudron, Champigneulle, Guyomard, & Largiader, 2011;Dudgeon et al, 2006;Frank & Baret, 2013;Laikre, 1999). For these reasons, an efficient conservation strategy is needed in these populations in terms of protecting original species.…”

Section: Discussionmentioning

confidence: 99%

Phenotypic differentiation analysis: A case study in hybridizing Çoruh trout (Salmo coruhensis), Rize trout (Salmo rizeensis) and brown trout (Salmo trutta fario)

2017

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The aim of this study was to determine and compare the phenotypic variation in Çoruh trout (Salmo coruhensis), Rize trout (Salmo rizeensis), brown trout (Salmo trutta fario) and their native hybrids (S. rizeensis × S. t. fario; S. t. fario × S. coruhensis; S. rizeensis × S. coruhensis). The numbers and diameters of red and black spots were determined on operculum, fins and above and below the lateral line. The results from this study indicate that there were differences in spotting pattern, colour pattern or fin pigmentation traits between S. rizeensis, S. t. fario, S. coruhensis and their hybrids. Consequently, native S. rizeensis, S. t. fario and S. coruhensis were affected by interaction and phenotypic plastic aspects of traits in S. rizeensis were dominant in their hybrids (S. rizeensis × S. t. fario; S. rizeensis × S. coruhensis).

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“…Caudron et al . ), impacting genetic diversity with a homogenisation or replacement of local genotypes and in turn, a disruption of local adaptation (Andow & Zwahlen ; Bourret et al . ).…”

Section: Discussionmentioning

confidence: 99%

“…Only one study in our database quantified the genetic impacts of introduced salmonids (Caudron et al . ), therefore this level of biological organisation could not be considered further.…”

Section: Methodsmentioning

confidence: 99%

Global Salmonidae introductions reveal stronger ecological effects of changing intraspecific compared to interspecific diversity

2016

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The introduction of organisms within the native range of wild conspecifics is a widespread phenomenon and locally modifies patterns in intraspecific diversity. However, our knowledge of the resulting ecological effects, as opposed to those caused by invasion-induced changes in interspecific diversity, is still limited. Here, we investigated the ecological effects of native and non-native invaders across levels of biological organisations and recipient organisms using the global and long history introductions of salmonids. Our meta-analysis demonstrated that the global effects of native species introductions exceeded those induced by non-native invaders. The impacts of native invaders were primarily manifested at the individual level on wild conspecifics, but remained largely unexplored on other native organisms and at the community and ecosystem levels. Overlooked and poorly appreciated, quantifying the impacts of native invaders has important implications because human-assisted introductions of domesticated organisms are ubiquitous and likely to proliferate in the future.

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Assessment of three strategies practiced by fishery managers for restoring native brown trout (Salmo trutta) populations in Northern French Alpine Streams

Cited by 22 publications

References 73 publications

Early effects of the strategies of creating a genetic refuge and direct translocation for conserving and restoring populations of native brown trout

Early effects of the strategies of creating a genetic refuge and direct translocation for conserving and restoring populations of native brown trout

Phenotypic differentiation analysis: A case study in hybridizing Çoruh trout (Salmo coruhensis), Rize trout (Salmo rizeensis) and brown trout (Salmo trutta fario)

Global Salmonidae introductions reveal stronger ecological effects of changing intraspecific compared to interspecific diversity

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