Trophic complexity of small fish in nearshore food webs

Holly A. Wellard Kelly, Katya E. Kovalenko, Tyler D. Ahrenstorff, Bethany J. Bethke, Valerie J. Brady, Joshua D. Dumke, Gretchen J.A. Hansen, Heidi M. Rantala

Research output: Contribution to journalArticlepeer-review

Abstract

Small nearshore fishes are an important part of lacustrine and functional diversity and link pelagic and benthic habitats by serving as prey for larger nearshore and offshore fishes. However, the trophic complexity of these small nearshore fishes is often unrecognized and detailed studies of their role in food webs are lacking. Here, we examined niche space patterns of small nearshore fish species using Bayesian analyses of carbon and nitrogen stable isotope data in nine freshwater lakes that are among the largest lakes in Minnesota. We found considerable variability in niche areas within species and high variability in niche overlap across species. At the assemblage level, niche overlap (average diet overlap of all species pairs at a lake) decreased as whole-lake species richness increased, possibly indicating a greater degree of resource specialization in more speciose lakes. Overall fish niche space was weakly but significantly related to niche space of their invertebrate prey. Although nearshore benthic resources contributed to fish diets in all lakes, all fish species also had non-negligible and variable contributions from pelagic zooplankton. This inter- and intraspecific variability in trophic niche space likely contributes to the multi-level trophic complexity, functional diversity, and potentially food web resilience to ecosystem changes.

Original languageEnglish (US)
JournalHydrobiologia
DOIs
StateAccepted/In press - 2021
Externally publishedYes

Bibliographical note

Funding Information:
Funding for this research was provided by the Minnesota Environmental and Natural Resources Trust Fund as recommended by the Minnesota Aquatic Invasive Species Research Center (MAISRC) and the Legislative-Citizen Commission on Minnesota Resources (LCCMR), and NRRI-UMD.

Publisher Copyright:
© 2021, The Author(s), under exclusive licence to Springer Nature Switzerland AG.

Keywords

  • Functional diversity
  • Macroinvertebrates
  • Niche overlap
  • Niche space
  • Stable isotopes

Fingerprint Dive into the research topics of 'Trophic complexity of small fish in nearshore food webs'. Together they form a unique fingerprint.

Cite this