Trophic position of the species and site trophic state affect diet niche and individual specialization: from apex predator to herbivore

Author:

Vejřík Lukáš1,Vejříková Ivana1,Blabolil Petr1,Sajdlová Zuzana1,Kiljunen Mikko2,Kočvara Luboš1,Kolařík Tomáš1,Bartoň Daniel1,Jůza Tomáš1,Šmejkal Marek1,Peterka Jiří1,Čech Martin1

Affiliation:

1. Institute of Hydrobiology (ASCR)

2. University of Jyväskylä

Abstract

Abstract Intra-species variability in a diet niche, specifically total niche width (TNW), individual niche width (INW), and individual specialization (IS), was studied using an innovative approach without sacrificing the animals. Stable isotopes (δ13C, δ15N) in four body tissues differing in isotopic half-life were analyzed from four freshwater fish species representing different trophic positions. TNW was widest for the apex predator (European catfish) and narrowest for the obligate predator (Northern pike). INW exhibited a polynomial trend for European catfish, Northern pike and Eurasian perch (mesopredator), decreasing with body mass and increasing again after exceeding a certain species-dependent body mass threshold. Thus, for ectotherms, apex predator status is linked rather to its size than to the species. In herbivores (rudd), INW increased with body mass. IS of predators negatively correlated with site trophic state. The trends can be generalized to other species at similar trophic positions in either aquatic or terrestrial systems.

Publisher

Research Square Platform LLC

Reference66 articles.

1. Foraging theory upscaled: the behavioural ecology of herbivore movement;Owen-Smith N;Philos. Trans. R. Soc. Lond. B. Biol. Sci.,2010

2. DeSantis, L. R. G. et al. Global long-term stability of individual dietary specialization in herbivorous mammals. Proc. R. Soc. B. 289, 20211839 (2022).

3. Morphological Variation and Width of Ecological Niche;Valen L;Am. Nat,1965

4. Intrapopulation variation in gray wolf isotope (δ15 N and δ13C) profiles: implications for the ecology of individuals;Urton EJM;Oecologia,2005

5. Individual specialization in diet by a generalist marine predator reflects specialization in foraging behaviour;Woo KJ;J. Anim. Ecol.,2008

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