“Sockeye salmon repatriation leads to population re-establishment and rapid introgression with native kokanee”
(Evolutionary Applications 9 (10), 1301-1311, 2016)
ART 204
Re-establishing salmonid populations to areas historically occupied has the substantial potential for conservation gains; however, such interventions also risk negatively impacting native resident stocks. Here, we assessed the success of the hatchery-assisted reintroduction of anadromous sockeye salmon (Oncorhynchus nerka) into Skaha Lake, British Columbia, Canada, and evaluated the genetic consequences for native kokanee, a freshwater-obligate ecotype, using single nucleotide polymorphism genotypic data collected from the reference samples of spawning Okanagan River sockeye and Skaha Lake kokanee presockeye reintroduction, along with annual trawl survey and angler-caught samples obtained over an eight-year period. Significant differentiation was detected between sockeye and kokanee reference samples, with >99% stock assignment. Low proportions of sockeye and hybrids were detected within 2008 and 2010 age-0 trawl samples; however, by 2012, 28% were sockeye, rising to 41% in 2014. The number of hybrids detected rose proportionally with the increase in sockeye and exhibited an intermediate phenotype. Our results indicate that the reintroduction of anadromous sockeye to Skaha Lake is succeeding, with large numbers returning to spawn. However, hybridization with native kokanee is of concern due to the potential for demographic or genetic swamping, with ongoing genetic monitoring necessary to assess the long-term effects of introgression and to support interactive fisheries management.
(Description Source: Wiley Online Library)
Authors
Andrew J. Veale is a former UBC Okanagan post-doctoral associate interested in how genetics and genomics can inform the management of invasive species and fisheries.
Michael Russello is a Professor of Biology at the University of British Columbia (Okanagan). He received his PhD in Ecology and Evolutionary Biology from Columbia University in 2003. Work in his lab at UBC is at the interface of ecology and evolution, investigating the genomics of adaptation, life history variation, population dynamics and speciation. These basic insights contribute to informing wildlife conservation and invasive species management in Canada and beyond.
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DOI: https://doi.org/10.1111/eva.12430
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