Trophic Competition of Common Sculpin and Stone Loach with Juvenile Salmons of Gen. Salmo in Tributaries of the Onega Lake

Shustov, Yu. A.; Tyrkin, I. A.; Rasputina, Ye. N.

doi:10.1615/hydrobj.v50.i6.30

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“…Isotopic niche overlap was not greater and isotopic structure was not smaller or condensed over winter or summer relative to other seasons as hypothesized. Temporal reductions in food availability, like in winter, can increase niche overlap between species of the same trophic guild (Shustov et al 2014;Sánchez-Hernández et al 2016). Similarly, periods of high food availability, like in summer, can increase trophic niche overlap when species feed on similar abundant resources (Kawaguchi and Nakano 2001;Chen et al 2011).…”

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confidence: 99%

Trophic niche overlap and abundance reveal potential impact of interspecific interactions on a reintroduced fish

Larocque

Johnson

Fisk

2021

Can. J. Fish. Aquat. Sci.

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Conceptually trophic niche overlap and species abundance can describe the strength and number of interspecific trophic interactions to determine the competitive impact on reintroduced species or other ecosystem changes. We use an example with young-of-year (YOY) Atlantic salmon (<i>Salmo salar</i>) reintroductions to determine if trophic niche overlaps and abundances limit restoration success. Using seasonal stable isotopes and abundance estimates for invertivorous fishes in three Lake Ontario tributaries, we assessed community isotopic structure, trophic niche overlap, and the impact of the niche overlap by incorporating relative abundance. Brown trout (<i>Salmo trutta</i>) YOY could be a strong competitor with a high trophic niche overlap with Atlantic salmon YOY but at lower abundances relative to Atlantic salmon minimizes impact. Stream resident fish communities appeared to partition resources across seasons such that abundant species had low trophic niche overlap to minimize overall competition with Atlantic salmon YOY given available resources, indicating niche complementarity. Through joint consideration of trophic overlap and abundance using our conceptual model, the competitive impact of community composition on a reintroduced species could be assessed.

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