2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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6/06/2017 | 10:00 AM - 10:15 AM | SPATIAL CONNECTIVITY OF ADFLUVIAL AND STREAM-RESIDENT LAHONTAN CUTTHROAT TROUT: IMPLICATIONS FOR POPULATION RESILIENCE, MANAGEMENT, AND RESTORATION | 306C

SPATIAL CONNECTIVITY OF ADFLUVIAL AND STREAM-RESIDENT LAHONTAN CUTTHROAT TROUT: IMPLICATIONS FOR POPULATION RESILIENCE, MANAGEMENT, AND RESTORATION

Most adfluvial populations of Lahontan cutthroat trout (LCT) have been extirpated due, in part, to severed connections between lakes and tributaries. Consequently, there is significant interest in understanding population connections across lake and stream habitats to facilitate restoration. We studied spatial stream use of adfluvial and stream-resident LCT in the Summit Lake Basin, which has the largest viable population of adfluvial LCT, a robust population in the stream that feeds the lake, and a stream system free of migration barriers. Adfluvial spawning adults concentrated their activity in low stream reaches, but also migrated nearly to the headwaters. Throughout the stream system, we saw stream-tagged LCT migrate to the lake and found evidence of stream-residency. High flows corresponded to more small LCT migrating to the lake and more adfluvial LCT entering the stream to spawn, which led to more accessing the upper watershed. Results suggest high spatial connectivity between adfluvial and stream-resident populations that will increase in wet years, and that stream-residents may provide emigrants to the lake. Overall population resilience relies on a strong connection between lake and stream habitats.

C15 Population Ecology
C12 Conservation Ecology
C02 Fish and Other Aquatic Vertebrates

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Presenters/Authors

Teresa Campbell (), University of Nevada Reno, tcampbs@gmail.com;