2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2019 | 2:30 PM - 2:45 PM | FITNESS CONSEQUENCES OF LIFE-HISTORY VARIATION IN SPAWNING MIGRATIONS OF TWO INLAND SALMONIDS | 250 CF
FITNESS CONSEQUENCES OF LIFE-HISTORY VARIATION IN SPAWNING MIGRATIONS OF TWO INLAND SALMONIDS
Life-history diversity can buffer populations against stochastic events by spreading risk and production over large geographic areas or across cohorts, stabilizing population productivity. The presence and timing of spawning migrations is an important life-history trait of inland salmonids. Otolith microchemistry analysis is increasingly used as a tool to trace fish migrations, yet few studies have traced migrations in small inland watersheds. Here, we evaluate the use of tributary habitat for spawning and describe and compare fluvial Brown Trout (Salmo trutta) and Rainbow Trout (Oncorhynchus mykiss) natal origin distribution, time spent in natal streams, and spawning site fidelity. 64% of Rainbow Trout and 56% of Brown Trout migrated after hatching. Brown Trout showed greater variation in time spent in natal tributaries suggesting that individuals are temporally distributing risk among offspring. By contrast, Rainbow Trout showed greater variation in natal origin, suggesting that individuals are spatially distributing risk among offspring. We also evaluated the fitness consequences of these migration strategies by examining growth rates. Our results indicate there is high inter and intra-specific migration variation in inland salmonid populations, but these are not linked to substantial variation in growth rates.
- Life History
- Movement
- Multi-stressors
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Presenters/Authors
Annika Walters
(), USGS Wyoming Coop Fish and Wildlife Unit, annika.walters@uwyo.edu;
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Lindsy Ciepiela
(), USGS WY Coop Unit, lrciepie@gmail.com;
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