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

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 (Salmo salar) reintr...

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Bibliographic Details
Published inCanadian journal of fisheries and aquatic sciences Vol. 78; no. 6; pp. 765 - 774
Main Authors Larocque, Sarah M, Johnson, Timothy B, Fisk, Aaron T
Format Journal Article
LanguageEnglish
Published Ottawa NRC Research Press 01.06.2021
Canadian Science Publishing NRC Research Press
Subjects
Abundance
Community composition
Complementarity
Composition
Environmental aspects
Environmental changes
Fish
Fishes
Interspecific relationships
Isotopes
Niche (Ecology)
Niche overlap
Niches
Relative abundance
Salmo salar
Salmo trutta
Salmon
Salmoniformes
Species
Stable isotopes
Tributaries
Trophic relationships
Zoological research
Canada
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Summary: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 (Salmo salar) reintroductions to determine whether 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 (Salmo trutta) YOY could be a strong competitor with a high trophic niche overlap with Atlantic salmon YOY, but at lower abundances relative to Atlantic salmon there is minimal 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.
ISSN:0706-652X
1205-7533
DOI:10.1139/cjfas-2020-0204