Impacts of stocking and its intensity on effective population size in Brook Charr (Salvelinus fontinalis) populations

Gossieaux, Philippine; Bernatchez, Louis; Sirois, Pascal; Garant, Dany

doi:10.1007/s10592-019-01168-2

Cited by 20 publications

(29 citation statements)

References 72 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the phenotype analyses, we used samples from fish captured with gill nets in 12 lakes ( n = 550 fish; Appendix ) that are part of a larger study in the three wildlife reserves (see Gossieaux et al 2019). For the stable isotopes analyses, we used data from four lakes in the same system ( n = 438; Appendix ).…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, we obtained tissue samples from hatcheries (Jacques Cartier n = 53, Saint‐Alexis des Monts n = 80, Lac des Écorces n = 40) and from lake Bourassa ( n = 40). All protocols and procedures employed were reviewed and approved by the ministère des Forêts, de la Faune et des Parcs (Québec, Canada; see Gossieaux et al 2018, 2019).…”

Section: Methodsmentioning

confidence: 99%

“…We investigated these questions in Brook Trout ( Salvelinus fontinalis ), a very popular salmonid for recreational angling, which has been massively stocked for decades in North America, and notably in Québec, Canada. Previous studies in this region showed that hybridization between domestic and wild fish is common and that stocked lakes present various levels of introgression of domestic genes (Marie et al 2010, 2012, Gossieaux et al 2018, 2019, Létourneau et al 2018). We used data from 12 introgressed populations to determine the extent of phenotypic divergence between individuals that have different genetic origins.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of genetic origin on phenotypic divergence in Brook Trout populations stocked with domestic fish

et al. 2020

Self Cite

View full text Add to dashboard Cite

Phenotypic changes due to human activities are occurring at a far greater speed than those originating from natural causes in animal populations. For instance, phenotypic divergence among individuals may arise in populations supplemented with farm‐reared fish that are known to display different phenotypes from those of wild individuals because of domestication. Little is known about how these phenotypic differences are maintained when domestic and wild individuals face the same environment and hybridize, as it is the case after supplementation. In this study, we assessed the effect of genetic origin of individuals on phenotypic trait divergence (morphology, growth, and size‐at‐age) in stocked populations of Brook Trout (Salvelinus fontinalis). We also evaluated whether genetic origin influences habitat use by documenting trophic niche and/or level using stable isotope analyses. We found significant effects of genetic origin on phenotypic variables with domestic fish generally being more fusiform and larger than wild and hybrid individuals. Lake identity also explained most of the variation in phenotypic variables, meaning that population‐specific attributes were important drivers of morphology and size. Our results also showed that domestic fish were feeding in more littoral niches and at a higher trophic level than wild and hybrid individuals, suggesting that differences in feeding habits could partially explain phenotypic differences. These results highlight the importance of accounting for the genetic composition of populations when assessing the causes of phenotypic divergence in the wild.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of genetic origin on phenotypic divergence in Brook Trout populations stocked with domestic fish

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, this mechanism is more likely to explain local‐scale correlations than genome‐wide patterns. Second, given the generally small effective population size of these brook charr lacustrine populations (Gossieux, Bernatchez, Sirois, & Garant, ), random drift may also be responsible for variable ancestry locally along the genome (Martin & Jiggins, ) and is not expected to produce consistent patterns across lakes. Third, the most likely evolutionary mechanism that could explain the general negative correlation would be a dominant effect of associative overdominance (Kim et al, ).…”

Section: Discussionmentioning

confidence: 99%

The role of recombination on genome‐wide patterns of local ancestry exemplified by supplemented brook charr populations

et al. 2019

Self Cite

View full text Add to dashboard Cite

Assessing the immediate and long‐term evolutionary consequences of human‐mediated hybridization is of major concern for conservation biology. Several studies have documented how selection in interaction with recombination modulates introgression at a genome‐wide scale, but few have considered the dynamics of this process within and among chromosomes. Here, we used an exploited freshwater fish, the brook charr (Salvelinus fontinalis), for which decades of stocking practices have resulted in admixture between wild populations and an introduced domestic strain, to assess both the temporal dynamics and local chromosomal variation in domestic ancestry. We provide a detailed picture of the domestic ancestry patterns across the genome using about 33,000 mapped single nucleotide polymorphisms genotyped in 611 individuals from 24 supplemented populations. For each lake, we distinguished early‐ and late‐generation hybrids using information regarding admixture tracts. To assess the selective outcomes following admixture we then evaluated the relationship between recombination and admixture proportions at three different scales: the whole genome, chromosomes and within 2‐Mb windows. This allowed us to detect a wide range of evolutionary mechanisms varying along the genome, as reflected by the finding of favoured or disfavoured introgression of domestic haplotypes. Among these, the main factor modulating local ancestry was probably the presence of deleterious recessive mutations in the wild populations, which can be efficiently hidden to selection in the presence of long admixture tracts. Overall, our results emphasize the relevance of taking into consideration local ancestry information to assess both the temporal and the chromosomal variation in local admixture ancestry toward better understanding post‐hybridization evolutionary outcomes.

show abstract

“…The release of hatchery salmonids can pose both ecological and genetic risks to wild populations, where ecological impacts can occur through interactions related to competition, predation, and disease transfer (Krueger & May, 1991;Naish et al, 2007;Rand et al, 2012). Genetic impacts on wild populations can occur through hybridization and introgression whereby such events can reduce genetic diversity (Christie et al, 2012;Gossieaux, Bernatchez, Sirois, | 1071 LEHNERT ET aL. 1977;Nova Scotia Government, 2018).…”

Section: Introductionmentioning

confidence: 99%

Multiple decades of stocking has resulted in limited hatchery introgression in wild brook trout (Salvelinus fontinalis) populations of Nova Scotia

Lehnert

Baillie

MacMillan

et al. 2020

Evolutionary Applications

View full text Add to dashboard Cite

Many populations of freshwater fishes are threatened with losses, and increasingly, the release of hatchery individuals is one strategy being implemented to support wild populations. However, stocking of hatchery individuals may pose long-term threats to wild populations, particularly if genetic interactions occur between wild and hatchery individuals. One highly prized sport fish that has been heavily stocked throughout its range is the brook trout (Salvelinus fontinalis). In Nova Scotia, Canada, hatchery brook trout have been stocked since the early 1900s, and despite continued stocking efforts, populations have suffered declines in recent decades. Before this

show abstract

Impacts of stocking and its intensity on effective population size in Brook Charr (Salvelinus fontinalis) populations

Cited by 20 publications

References 72 publications

Effects of genetic origin on phenotypic divergence in Brook Trout populations stocked with domestic fish

Effects of genetic origin on phenotypic divergence in Brook Trout populations stocked with domestic fish

The role of recombination on genome‐wide patterns of local ancestry exemplified by supplemented brook charr populations

Multiple decades of stocking has resulted in limited hatchery introgression in wild brook trout (Salvelinus fontinalis) populations of Nova Scotia

Contact Info

Product

Resources

About