Population dynamics of threatened Lahontan cutthroat trout in Summit Lake, Nevada.

Scientific Reports
James B SimmonsKevin Shoemaker

Abstract

Summit Lake, Nevada (USA) is the last high-desert terminal lake to have a native self-sustaining population of threatened Lahontan cutthroat trout (Oncorhynchus clarkii henshawi). From spring 2015 to fall 2017, we quantified adult abundance and survival and the total annual spawning run. Abundance and survival were estimated with mark-recapture using PIT tags, and the annual spawning run was estimated with PIT tag detections and counts of spawners. Adult abundance fluctuated from 830 (95% CI 559-1248) to 1085 (95% CI 747-1614), with no overall temporal trend, as a decrease in male abundance was generally offset by an equal increase in female abundance. Estimated mean adult survival was 0.51 (95% CI 0.44-0.58). The spawning run increased from 645 (2015) to 868 (2016), but then decreased slightly to 824 (2017, mean = 789 ± 118). Female spawners increased in 2016 but decreased slightly in 2017, whereas male spawners decreased each year. In addition, the proportion of adults that spawned each year increased overall. Our study suggests that the adult population remained stable although most of the study period included the recent, severe regional drought in the western United States (2012-2016).

References

Mar 28, 2009·Ecological Applications : a Publication of the Ecological Society of America·Fiona D Johnston, John R Post
May 1, 2010·Science·Stuart H M ButchartReg Watson
Dec 5, 2013·Conservation Biology : the Journal of the Society for Conservation Biology·Annika W WaltersMichelle M McClure
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Nov 26, 2015·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Miriam FenkesRobert L Nudds
Nov 5, 2016·Conservation Biology : the Journal of the Society for Conservation Biology·Simone TenanMeritxell Genovart

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