Macrophytes shape trophic niche variation among generalist fishes
Vejříková, I., Eloranta, A. P., Vejřík, L., Šmejkal, M., Čech, M., Sajdlová, Z., Frouzová, J., Kiljunen, M., & Peterka, J. (2017). Macrophytes shape trophic niche variation among generalist fishes. PLoS ONE, 12(5), Article e0177114. https://doi.org/10.1371/journal.pone.0177114
Julkaistu sarjassa
PLoS ONETekijät
Päivämäärä
2017Tekijänoikeudet
© 2017 Vejříková et al. This is an open access article distributed under the terms of the
Creative Commons Attribution License.
Generalist species commonly have a fundamental role in ecosystems as they can integrate
spatially distinct habitats and food-web compartments, as well as control the composition,
abundance and behavior of organisms at different trophic levels. Generalist populations typically
consist of specialized individuals, but the potential for and hence degree of individual
niche variation can be largely determined by habitat complexity. We compared individual
niche variation within three generalist fishes between two comparable lakes in the Czech
Republic differing in macrophyte cover, i.e. macrophyte-rich Milada and macrophyte-poor
Most. We tested the hypothesis that large individual niche variation among generalist fishes
is facilitated by the presence of macrophytes, which provides niches and predation shelter
for fish and their prey items. Based on results from stable nitrogen (δ15N) and carbon (δ13C)
isotopic mixing models, perch (Perca fluviatilis L.) and rudd (Scardinius erythrophthalmus
(L.)) showed larger individual variation (i.e., variance) in trophic position in Milada as compared
to Most, whereas no significant between-lake differences were observed for roach
(Rutilus rutilus (L.)). Contrary to our hypothesis, all the three species showed significantly
lower individual variation in the relative reliance on littoral food resources in Milada than in
Most. Rudd relied significantly more whereas perch and roach relied less on littoral food
resources in Milada than in Most, likely due to prevalent herbivory by rudd and prevalent
zooplanktivory by perch and roach in the macrophyte-rich Milada as compared to macrophyte-poor
Most. Our study demonstrates how the succession of macrophyte vegetation,
via its effects on the physical and biological complexity of the littoral zone and on the availability
of small prey fish and zooplankton, can strongly influence individual niche variation
among generalist fishes with different ontogenetic trajectories, and hence the overall foodweb
structures in lake ecosystems.
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1932-6203Asiasanat
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https://converis.jyu.fi/converis/portal/detail/Publication/26999394
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