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- W2150890445 abstract "Pyramid Lake, Nevada is one of the last remaining strongholds for lacustrine Lahontan cutthroat trout (Oncorhynchus clarkii henshawi; LCT); almost all other large lake populations have undergone population declines or extirpation as a result of invasive species interactions and habitat degradation. In Pyramid Lake, LCT have persisted despite anthropogenic alterations, but the population now depends entirely on stocking programs and efficient management. The purpose of this study was to identify important food-web interactions. The objectives were to 1) compare seasonal depth distributions, seasonal diet overlap, and trophic niche overlap between LCT and non-native Sacramento perch (Archoplites interruptus); and 2) to evaluate the seasonal depth distribution patterns of LCT and native tui chub (Gila bicolor), seasonal changes in LCT diet, and current LCT trophic position (TP). LCT remain apex predators, with both trophic position (large LCT TP = 4.30 ± 0.04 [mean±1.96SE]) and diet composition indicating high rates of piscivory (average annual rate of piscivory = 77.1% for large LCT; > 400mm TL). Small LCT (200 400mm TL) exhibited weak dietary overlap (Schoener’s Index = 0.55) and large LCT exhibited strong overlap (0.72) with Sacramento perch. Small and large LCT, and Sacramento perch, preyed most heavily on tui chub. Isotope data indicates strong overlap between large LCT and Sacramento perch niche space (large LCT 88.6%); 7 however, catch rates indicate that Sacramento perch are only present in small numbers throughout the lake. LCT demonstrate high rates of piscivory, which subsequently suggests that they are not negatively influenced by the presence of Sacramento perch and do not appear to be exceeding carrying-capacity." @default.
- W2150890445 created "2016-06-24" @default.
- W2150890445 creator A5081031448 @default.
- W2150890445 date "2014-01-01" @default.
- W2150890445 modified "2023-09-27" @default.
- W2150890445 title "Trophic status, energetic demands, and factors affecting Lahontan cutthroat trout distribution in Pyramid Lake, Nevada" @default.
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