Snake River Sockeye Salmon Habitat and Limnological Research; 2004 Annual Report.

Kohler, Andre E.; Taki, Doug; Griswold, Robert G.

doi:10.2172/897660

Cited by 1 publication

(4 citation statements)

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“…Residual Sockeye Salmon are present in Redfish Lake (Rieman et al 1994) and Pettit Lake (Kohler et al 2004), where Sockeye Salmon growth rates are relatively high, but have not been documented in Alturas Lake, where growth rates are extremely low. Given the difficulty of migration, the endangered status of this population, and that natural anadromous Sockeye Salmon production remains well below replacement (Flagg et al 2004;Johnson et al 2020), production from nonmigratory life history forms may be important for the long-term persistence of the anadromous ecotype (Courter et al 2013;Eaton et al 2020).…”

Section: Discussionmentioning

confidence: 97%

“…1994) and Pettit Lake (Kohler et al. 2004), where Sockeye Salmon growth rates are relatively high, but have not been documented in Alturas Lake, where growth rates are extremely low. Given the difficulty of migration, the endangered status of this population, and that natural anadromous Sockeye Salmon production remains well below replacement (Flagg et al.…”

Section: Discussionmentioning

confidence: 99%

“…Following this action, repeated stocking efforts lead to the establishment of a nonnative, late shoal-spawning kokanee stock (Bowler 1990;Waples et al 2011). 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).…”

Section: Study Areamentioning

confidence: 99%

“…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).…”

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: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

“…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).…”

Section: Study Areamentioning

confidence: 99%

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