Discovery of out-of-basin introgression in Pettit Lake Sockeye Salmon: management implications for native genetics

Eaton, Kendra R.; Tardy, Kurt A.; Narum, Shawn R.; Powell, John R; Steele, Craig A.

doi:10.1007/s10592-021-01386-7

Cited by 3 publications

(3 citation statements)

References 48 publications

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“…Shoal-spawning anadromous and residual Sockeye Salmon have been successfully reestablished in Pettit Lake using Redfish Lake O. nerka (Kohler et al 2004;Waples et al 2011) (Table 2). Pettit Lake currently supports an introgressed population derived from nonnative kokanee and Redfish Lake Sockeye Salmon (Eaton et al 2021). Stream spawning habitat is limited, and stream spawning O. nerka are not present in this lake (our unpublished data).…”

Section: Study Areamentioning

confidence: 84%

“…Growth rates influenced life history outcomes in the Sawtooth Valley lakes. For example, in Pettit Lake, when growth rates were high and migration rates low, Sockeye Salmon introductions led to the establishment of a residual population (Eaton et al 2021). This population has been found to produce anadromous offspring and could help maintain the genetic and life history diversity of the evolutionarily significant unit (McElhany et al 2000;Waples et al 2011).…”

Section: Management Implicationsmentioning

confidence: 99%

“…Pettit Lake currently supports an introgressed population derived from nonnative kokanee and Redfish Lake Sockeye Salmon (Eaton et al. 2021). Stream spawning habitat is limited, and stream spawning O. nerka are not present in this lake (our unpublished data).…”

Section: Study Areamentioning

confidence: 99%

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Density Dependence in Three Snake River Sockeye Salmon Nursery Lakes in Central Idaho

Griswold¹,

Kohler

Tardy

et al. 2022

N American J Fish Manag

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Snake River Sockeye Salmon Oncorhynchus nerka, listed as an endangered species in 1991, currently inhabit three nursery lakes (Redfish, Pettit, and Alturas lakes) in the Sawtooth Valley, Idaho. Conspecific kokanee (lacustrine Sockeye Salmon) are also present in the lakes. Snake River Sockeye Salmon recovery efforts, initially focused on genetic conservation, are now attempting to rebuild naturally spawning populations using hatchery supplementation. However, in Sockeye Salmon nursery lakes, density dependence is frequently observed when elevated O. nerka abundance leads to declines in zooplankton biomass, body size, and shifts in community composition. In turn, these changes lead to reductions in juvenile O. nerka growth rates, survival, and adult returns. We examined a long‐term data set of O. nerka population metrics and associated zooplankton community metrics. We found evidence of density dependence within and among nursery lakes. We detected differences in zooplankton biomass, lengths of preferred zooplankton prey (Daphnia spp. and cyclopoid copepods), parr growth rates, and age‐1 smolt size among the three lakes. We found negative relationships between O. nerka density and zooplankton biomass and size. We identified positive relationships between zooplankton biomass and two response variables: smolt size at migration and growth rates of hatchery parr. The relationships were generally similar among lakes. Variable outcomes were a result of differences in O. nerka density (or zooplankton biomass), controlled primarily by the relative proportion of spawning and rearing habitat in each lake. Understanding unique lake habitats, ecological interactions, and the role of density dependence is germane to management of Snake River Sockeye Salmon populations.

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Section: Study Areamentioning

confidence: 84%

Section: Management Implicationsmentioning

confidence: 99%