Journal
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
Volume 76, Issue 3, Pages 426-437Publisher
CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS
DOI: 10.1139/cjfas-2017-0483
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Funding
- Summit Lake Paiute Tribe
- US Fish and Wildlife Service's Tribal Wildlife Grant Program [F13AP00375]
- National Fish and Wildlife Foundation's Desert Terminal Lakes Restoration Fund [40577]
- Bureau of Reclamation's Desert Terminal Lakes Program
- Bureau of Indian Affairs' Fisheries Management Services Contract [A10AV00358]
- Trout Unlimited
- University of Nevada's College of Science
- Global Water Center
- California Lake Management Society
- Nevada Bighorns Unlimited
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Population connectivity between resident and migratory cutthroat trout (Oncorhynchus clarkii ssp.) is understudied, but has implications for population viability and management. We examined evidence for stream residency, studied the spatial patterns of stream use by adfluvial and stream-resident trout, and measured migration rates with changing stream depth for Lahontan cutthroat trout (Oncorhynchus clarkii henshawi) in the Summit Lake Basin, Nevada (USA). Passive integrated transponder technology and a fry trap were used to track fish movements and identify the distribution of resident and adfluvial trout. Stream residents were distributed throughout the network. Adfluvial spawners concentrated in lower reaches, but also migrated up to 12.9 km. Adfluvial juveniles migrated to the lake from lower reaches and from upstream of adfluvial spawners. High stream depths coincided with more adfluvial juveniles migrating to the lake and more adfluvial spawners moving into the stream, which led to more accessing the upper watershed. This work shows that connectivity is central to adfluvial-resident Lahontan cutthrout trout population dynamics and may lead to increased probability of persistence - a characteristic of these isolated, threatened trout populations.
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