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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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
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Abstract 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.
AbstractList 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.
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. D'un point de vue conceptuel, le chevauchement de niches trophiques et l'abondance d'especes peuvent servir a decrire la force et le nombre des interactions trophiques entre especes dans le but de determiner l'impact concurrentiel sur des especes reintroduites ou d'autres modifications des ecosystemes. Nous utilisons l'exemple de reintroductions de jeunes saumons atlantiques (Salmo salar) de l'annee pour etablir si les chevauchements de niches trophiques et l'abondance limitent le succes du retablissement. En utilisant des analyses d'isotopes stables et des estimations de l'abondance saisonnieres pour des poissons invertivores dans trois affluents du lac Ontario, nous evaluons la structure isotopique des communautes, le chevauchement de niches trophiques et l'impact de ce chevauchement en tenant compte de l'abondance relative. De jeunes truites brunes (Salmo trutta) de l'annee pourraient etre d'importants concurrents dont la niche trophique chevauche fortement celle des jeunes saumons atlantiques de l'annee, mais leur faible abondance relative par rapport a celle des saumons atlantiques en minimise l'impact. Les communautes de poissons residents des cours d'eau semblent faire preuve de partage referentiel des ressources d'une saison a l'autre, de sorte que les niches trophiques des especes abondantes se chevauchent peu afin de minimiser la concurrence globale avec les jeunes saumons atlantiques de l'annee etant donne les ressources disponibles, ce qui indique une complementarite des niches. En considerant le chevauchement trophique et l'abondance ensemble dans notre modele conceptuel, nous sommes en mesure d'evaluer l'impact concurrentiel de la composition des communautes sur une espece reintroduite. [Traduit par la Redaction]
Audience Academic
Author Johnson, Timothy B
Larocque, Sarah M
Fisk, Aaron T
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Snippet Conceptually, trophic niche overlap and species abundance can describe the strength and number of interspecific trophic interactions to determine the...
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SubjectTerms 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
Title Trophic niche overlap and abundance reveal potential impact of interspecific interactions on a reintroduced fish
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