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journal article Open Access Jul 03, 2023

Lake depth alters the trajectory of ontogenetic niche shifts in Eurasian perch (Perca fluviatilis) in small lakes

Ashley Trudeau Thomas Mehner ORCID Thomas Klefoth ORCID Sven Matern ORCID Robert Nikolaus ORCID Robert Arlinghaus ORCID
Ecology of Freshwater Fish Vol. 33 No. 1 · Wiley
View at Publisher Save 10.1111/eff.12738
Abstract
AbstractThe trophic niche of aquatic generalist predators is influenced by ontogeny, habitat characteristics, availability and type of prey, and competitive interactions. Many interrelated lake characteristics influence the availability of prey and may thereby impact foraging niches and the trajectory of ontogenetic niche shifts. Our work uses Eurasian perch (Perca fluviatilis) as a model species to examine the correlation of multiple lake and fish community characteristics with the size‐dependency of perch populations' realised trophic niche. We used carbon and nitrogen stable isotopes to correlate the changes in perch trophic position across a gradient of total lengths in seven gravel pit lakes that differed in lake morphology, habitat heterogeneity, productivity, structural complexity, and fish community composition. Perch populations in lakes with more shallow‐water habitat reached a higher trophic position at smaller sizes than perch in deeper lakes. However, the changes in trophic position with increasing size were less pronounced compared to perch from deeper lakes. Large individuals from the latter perch populations ultimately achieved higher mean trophic positions compared to fish from shallow lakes. Perch in lakes with more shallow‐water habitat may, therefore, achieve lower rates of piscivory because of higher relative availability of macroinvertebrates or greater competition with zooplanktivores. Our results suggest that large, piscivorous perch are more likely to develop in deeper lakes, and that these changes in perch trophic position across ontogeny are more strongly related to the depth of lakes than to the type of structured habitat in the littoral zone.
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Details
Published
Jul 03, 2023
Vol/Issue
33(1)
License
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Authors
A
Ashley Trudeau

Department of Fish Biology, Fisheries and Aquaculture Leibniz Institute of Freshwater Ecology and Inland Fisheries Berlin Germany; Division for Integrative Fisheries Management, Albrecht Daniel Thaer–Institute of Agriculture and Horticulture, Faculty of Life Sciences Humboldt‐Universität zu Berlin Berlin Germany; Center for Limnology University of Wisconsin—Madison Madison Wisconsin USA

T
Thomas Mehner

Department of Fish Biology, Fisheries and Aquaculture Leibniz Institute of Freshwater Ecology and Inland Fisheries Berlin Germany

T
Thomas Klefoth

Ecology and Conservation, Faculty of Nature and Engineering, Hochschule Bremen City University of Applied Sciences Bremen Germany

S
Sven Matern

Department of Fish Biology, Fisheries and Aquaculture Leibniz Institute of Freshwater Ecology and Inland Fisheries Berlin Germany; Division for Integrative Fisheries Management, Albrecht Daniel Thaer–Institute of Agriculture and Horticulture, Faculty of Life Sciences Humboldt‐Universität zu Berlin Berlin Germany

R
Robert Nikolaus

Department of Fish Biology, Fisheries and Aquaculture Leibniz Institute of Freshwater Ecology and Inland Fisheries Berlin Germany

R
Robert Arlinghaus

Department of Fish Biology, Fisheries and Aquaculture Leibniz Institute of Freshwater Ecology and Inland Fisheries Berlin Germany; Division for Integrative Fisheries Management, Albrecht Daniel Thaer–Institute of Agriculture and Horticulture, Faculty of Life Sciences Humboldt‐Universität zu Berlin Berlin Germany

Funding
Bundesministerium für Bildung und Forschung Award: 01LC1320A
Bundesamt für Naturschutz Award: 01LC1320B
Cite This Article
Ashley Trudeau, Thomas Mehner, Thomas Klefoth, et al. (2023). Lake depth alters the trajectory of ontogenetic niche shifts in Eurasian perch (Perca fluviatilis) in small lakes. Ecology of Freshwater Fish, 33(1). https://doi.org/10.1111/eff.12738
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