Genetic evaluation of translocation in artificially isolated populations of white-spotted charr (Salvelinus leucomaenis)

Yamamoto, Shoichiro; Maekawa, Koji; Tamate, Tsuyoshi; Koizumi, Itsuro; Hasegawa, Kou; Kubota, Hitoshi

doi:10.1016/j.fishres.2005.11.011

Cited by 40 publications

(31 citation statements)

References 31 publications

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“…Dakin et al (2007) showed that the Morgan-Falls dam on Chattahoochee River has reduced the genetic diversity in the population of shoal bass, Micropterus cataractae, especially in the upstream population compared to the downstream population, and the morphological differences between the two populations were highly significant. Yamamoto et al (2006) also noted similar results in white-spotted charr, Salvelinus leucomaenis, populations after 20 years from the construction of the dam.…”

Section: Introductionsupporting

confidence: 68%

“…Many freshwater fish species are currently threatened by direct and indirect influences of human activities, such as habitat destruction and fragmentation (Yamamoto et al, 2006). Construction of dams across rivers in particular affects fish movements, which may restrict the gene flow and lead to differentiation of populations (Meldgaard et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

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Detection of morphometric differentiation between isolated up- and downstream populations of Siah Mahi (Capoeta capoeta gracilis) (Pisces: Cyprinidae) in the Tajan River (Iran)

et al. 2011

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It has been postulated that the building of the Shahid-Rajaei dam on the Tajan River around 1995 has lead to the morphological divergence of Siah Mahi Capotes capoeta gracilis (Pisces) of up-and downstream populations due to the isolation. A 13-landmark morphometric truss network system was used to investigate the hypothesis. Univariate analysis of variance showed significant differences between the means of the two groups for 45 standardized morphometric measurements out of 78 characters studied. In linear discriminant function analysis (DFA), the overall assignment of individuals into their original groups was 87.6%. The proportion of individuals correctly classified into their original groups was 90.3% for upstream and 83.7% for downstream population. The principal component analysis (PCA) scatter plot of individual component scores between PC1 and PC2 showed 121 fish specimens grouped into two areas but with a relativity high degree of overlap between two populations. Clustering analysis based on Euclidean square distances among groups of centroids using an UPGMA resulted into two main clusters indicating two populations of C. c. gracilis. The present study indicated the presence of two morphologically different populations of C. c. gracilis in the Tajan River across the Shahid-Rajaei dam, probably due to their limited downstream dispersal and the elimination of upstream migration altogether, due the construction of the dam.

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Section: Introductionsupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Detection of morphometric differentiation between isolated up- and downstream populations of Siah Mahi (Capoeta capoeta gracilis) (Pisces: Cyprinidae) in the Tajan River (Iran)

et al. 2011

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“…2a), and N e was estimated to largely exceed 500 (ESM Table S1), suggesting the feasibility of long-term population persistence. Second, as suggested for other fragmented salmonid populations (Yamamoto et al 2006), artificial translocation of individuals from lower subpopulations (e.g., subpopulations 6 and 7) to isolated headwater subpopulations 1 and 2 is an alternative option to installing fish ladder and/or the dam removal. If this measure is carried out, reciprocal genetic exchange is expected to occur among subpopulations, which would have a similar effect with the first option, as well as an effect of delaying the rate of fixation of deleterious alleles (Lande 1995).…”

Section: Discussionmentioning

confidence: 99%

Demographic and genetic consequences of population subdivision in Formosa land-locked salmon Oncorhynchus masou formosanus, the southernmost subspecies of the salmonids

Sato

Gwo

2011

Ichthyol Res

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A few studies have evaluated demographic and genetic consequences of population subdivision by damming on the population as a whole. Formosa landlocked salmon Oncorhynchus masou formosanus have persisted as a relatively large population that has recently been subdivided into seven subpopulations by erosion-control dams and a natural waterfall. The present study simulated the demographic and genetic dynamics of this subdivided salmon population using VORTEX, an individual-based stochastic model. Although the population as a whole did not experience extinction over 200 simulation years, the loss of genetic variation was often detrimental ([10% loss). Isolated headwater subpopulations frequently reached extinction. Even when the subpopulations did persist through the 200 years, they experienced dramatic loss of genetic variation, suggesting short-term genetic threats. Due to the unidirectional dispersal of the fish, the damming puts headwater subpopulations at higher risk of extinction and loss of genetic variation, which affects persistence of the population as a whole, particularly from a genetic perspective.

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“…Translocating fish into novel habitat spreads the risk of extinction for that species, and may put other species at risk (Ricciardi and Simberloff 2009) and establish a new evolutionary trajectory for the translocated population when compared to the original donor populations (Stockwell and Leberg 2002;Stockwell et al 2003). Differential selection and founder effects are common when establishing new populations from a small number of individuals (Wilcox and Martin 2006;Yamamoto et al 2006). These risks can be minimized if translocations are repeated over time (if not detrimental to the source population) and if fish are moved between similar habitats within their historical range.…”

Section: Management Implicationsmentioning

confidence: 99%

Conserving Peripheral Trout Populations: The Values and Risks of Life on the Edge

Haak¹,

Williams²,

Neville³

et al. 2010

Fisheries

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Peripheral populations-generally defined as those at the geographic edge of the range-often have increased conservation value due to their potential to maximize within-species biodiversity, retain important evolutionary legacies, and provide the fodder for future adaptation. However, there has been little exploration of their conservation value in aquatic systems. Inland cutthroat trout (Oncorhynchus clarkii) subspecies provide a unique opportunity to evaluate the distribution of peripheral populations and patterns of persistence across a wide range of environmental conditions. Our assessment analyzed range-wide losses of peripheral and core populations since the 1800s, and evaluated the likelihood of persistence for remaining populations of five cutthroat trout subspecies: Bonneville, Colorado River, Yellowstone, Rio Grande, and westslope. For all five, we found that core and peripheral populations have declined substantially, but the amounts of habitat occupied by peripheral populations generally have declined at a greater magnitude. The more isolated peripheral populations typically exhibited the greatest declines. Remaining peripheral populations often failed to meet minimum persistence criteria. Our characterization of peripheral populations and their losses emphasizes the need for closer evaluation of conservation priorities and management actions for cutthroat trout and other fishes if the values of peripheral populations are to be maintained.

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Genetic evaluation of translocation in artificially isolated populations of white-spotted charr (Salvelinus leucomaenis)

Cited by 40 publications

References 31 publications

Detection of morphometric differentiation between isolated up- and downstream populations of Siah Mahi (Capoeta capoeta gracilis) (Pisces: Cyprinidae) in the Tajan River (Iran)

Detection of morphometric differentiation between isolated up- and downstream populations of Siah Mahi (Capoeta capoeta gracilis) (Pisces: Cyprinidae) in the Tajan River (Iran)

Demographic and genetic consequences of population subdivision in Formosa land-locked salmon Oncorhynchus masou formosanus, the southernmost subspecies of the salmonids

Conserving Peripheral Trout Populations: The Values and Risks of Life on the Edge

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