Effects of intraspecific hybridisation between two hatchery‐reared strains of Atlantic salmon, <i>Salmo salar</i>, on juvenile survival and fitness‐related traits

Audet, Chantal; Wilson, Chris C.; Pitcher, Trevor E.

doi:10.1111/fme.12195

Cited by 5 publications

(7 citation statements)

References 51 publications

(140 reference statements)

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“…differences of egg quality explain many of the results), there were no signs of outbreeding depression visible in F 1 generation crosses of landlocked salmon with anadromous salmon. This is consistent with a similar study by Audet et al (2017), who crossed anadromous and landlocked salmon without finding signs of outbreeding depression in F 1 generation. Careful evaluation of the long-term success of the hybridization crosses and backcrosses will, however, be required in the future since outbreeding depression may still become apparent only in later life-history stages or in subsequent generations (e.g.…”

Section: Discussionsupporting

confidence: 93%

See 1 more Smart Citation

Sperm motility and offspring pre- and posthatching survival in hybridization crosses among a landlocked and two anadromous Atlantic salmon populations: implications for conservation

Eronen

Kekäläinen

Piironen

et al. 2021

Can. J. Fish. Aquat. Sci.

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The landlocked salmon (Salmo salar m. sebago) endemic to Lake Saimaa, Finland, is critically endangered and severely threatened by low genetic diversity and inbreeding. To explore the possibility of increasing the genetic diversity of threatened salmon populations by controlled hybridization (genetic rescue), we studied sperm motility and offspring pre- and post-hatching survival in hybridization crosses of landlocked salmon with two geographically close anadromous salmon populations (Rivers Neva and Tornio) relative to the pure-bred populations. While some degree of gametic incompatibility between landlocked and Tornio salmon cannot be ruled out, there were no indications of outbreeding depression in survival traits in these first-generation hybridizations. Instead, pre-hatching survival of landlocked salmon eggs fertilized with Neva salmon sperm and post-hatching survival of anadromous salmon eggs fertilized with landlocked salmon sperm were higher than in pure-bred landlocked salmon. These differences might imply genetic rescue effects (hybrid vigor), although there were also strong maternal effects involved. Our results on early viability point to the possibility of applying genetic rescue to the landlocked salmon population by hybridization with an anadromous population.

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Section: Discussionsupporting

confidence: 93%

“…Gharrett et al 1999;McGinnity et al 2003;Gilk et al 2004). A possible caveat of our study is that outbreeding depression resulting from deleterious interactions among homozygous loci or disruption of co-adapted gene complexes may not become visible before F 2 generation (Edmands 2007;Whiteley et al 2015;Audet et al 2017).…”

Section: Discussionmentioning

confidence: 93%

Sperm motility and offspring pre- and posthatching survival in hybridization crosses among a landlocked and two anadromous Atlantic salmon populations: implications for conservation

Eronen

Kekäläinen

Piironen

et al. 2021

Can. J. Fish. Aquat. Sci.

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“…They can be potential candidates for enclosed common-environment studies to determine their fate under target wild conditions. Researchers have studied the consequences of stocking multiple strains of Atlantic salmon Salmo salar and assessed the correlation between genetics and reproductive quality in their broodstock [27]. Although the results showed no signs of outbreeding depression in the F1 generation, research on the fate of F2 back-crosses and subsequent generations would be of value, because previous studies have suggested that outbreeding depression is an outcome of intrinsic factors (factors influenced by genotypes), which are most likely to manifest in the F2 generation or later, when the original parental genomes on the same chromosome are subjected to recombination [27].…”

Section: Genetic Analysis Of the Progeny Groupsmentioning

confidence: 99%

“…Heterosis is not considered detrimental to conservation efforts, especially when it is undertaken using different populations within species with same chromosome numbers, which leads to the production of fertile offspring. The primary aim of selecting potential populations should be to avoid the outbreeding depression that may result from cross-breeding populations with fixed chromosome differences originating from different environments for over 20 generations or with no gene flow for over 500 years [26,27]. To avoid outbreeding depression when more than one population is used for restocking, it is best to choose parent populations that show low genetic divergence and are derived from similar local habitats [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Intraspecific Hybrids Versus Purebred: A Study of Hatchery-Reared Populations of Sterlet Acipenser ruthenus

Shivaramu

Lebeda

Kašpar

et al. 2020

Animals

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Hatchery-reared sterlet originating from the Danube and Volga river basins that showed population-discriminatory alleles on at least one microsatellite locus were used to produce purebred (within-population) and hybrid crosses to evaluate intraspecific hybridization with respect to the genetic polymorphism and physiological fitness of fish for commercial aquaculture and, conservation programs. Reciprocal crossing assessed the effect of parent position. The fish were reared in indoor and outdoor tanks and monitored over 504 days for growth traits. The highest final mean body weight (144.9 ± 59.5 g) was recorded in the Danube (♀) × Volga (♂) hybrid and the highest survival in the Volga (♀) × Danube (♂) hybrid. The Volga purebred exhibited the lowest mean body weight (124.8 ± 57.6 g). A set of six microsatellites was used to evaluate the heterozygosity. The mean number of alleles was highest in the Danube (♀) × Volga (♂) hybrid and lowest in the Volga purebred, suggesting an influence of the parent position in the hybridization matrix. The higher level of genetic polymorphism, as in the Danube (♀) × Volga (♂) hybrid, may confer greater fitness in a novel environment. Our analysis revealed that the intraspecific hybrids performed better than the purebred fish in the controlled and suboptimal rearing conditions.

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“…This strategy does require the recognition that there is the potential for outbreeding depression between distant populations of the focal species when multiple source populations are used, which can often manifest in second or third generations of outbreeding. For example, outbreeding depression was detected in Slimy Sculpin (Cottus cognatus) when reintroduced to part of its historical range (Huff et al 2011; but also see Audet et al 2017).…”

Section: Source-population Selectionmentioning

confidence: 99%

Reintroduction of fishes in Canada: a review of research progress for SARA-listed species

et al. 2019

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Fishes are among the most threatened taxa in Canada with over 70 species, subspecies, and (or) designatable units presently listed for protection under the Species at Risk Act (SARA). Protecting these species requires a diverse set of strategies based on the best-available data and information. One approach identified under SARA and in Canadian federal recovery strategies for improving the status of SARA-listed fishes is species reintroduction, which involves the release of individuals into areas from which they have been extirpated with the goal of re-establishing self-sustaining populations. The success of reintroduction relies on a comprehensive understanding of species ecology and life history, with considerations around population genetics and genomics. However, SARA-listed species are some of the most poorly known species in Canada due to their rarity and relative lack of research investment prior to the enactment of SARA. As a result, SARA-listed species have the most to lose if reintroduction activities are not carefully researched, planned, and executed. Therefore, the purpose of this review is to present an accessible summary on the state of reintroduction science for SARA-listed fishes in Canada with the hope of motivating future research to support reintroduction activities. We focus our review on 14 SARA-listed freshwater or anadromous fishes identified as candidates for reintroduction in federal recovery strategies. We follow the species-specific summaries with guidance on how basic research questions in population ecology, habitat science, and threat science provide a critical foundation for addressing knowledge gaps in reintroduction science. Subsequently, we identify the importance of genetic and genomic techniques for informing future research on the reintroduction of SARA-listed species. We conclude with recommendations for active, experimental approaches for moving reintroduction efforts forward to recover Canadian fishes.

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Effects of intraspecific hybridisation between two hatchery‐reared strains of Atlantic salmon, Salmo salar, on juvenile survival and fitness‐related traits

Cited by 5 publications

References 51 publications

Sperm motility and offspring pre- and posthatching survival in hybridization crosses among a landlocked and two anadromous Atlantic salmon populations: implications for conservation

Sperm motility and offspring pre- and posthatching survival in hybridization crosses among a landlocked and two anadromous Atlantic salmon populations: implications for conservation

Intraspecific Hybrids Versus Purebred: A Study of Hatchery-Reared Populations of Sterlet Acipenser ruthenus

Reintroduction of fishes in Canada: a review of research progress for SARA-listed species

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