Prey capture rates of two species of salmonids (Salmo trutta and Thymallus thymallus) in an artificial stream: effects of temperature on their functional response
2014 (English)In: Marine and Freshwater Behaviour & Physiology, ISSN 1023-6244, Vol. 47, no 2, 93-99 p.Article in journal (Refereed) Published
The foraging success of predators depends on how their consumption of prey is affected by prey density under different environmental settings. Here, we measured prey capture rates of drift-feeding juvenile brown trout and European grayling at different prey densities in an artificial stream channel at 5 and 11 °C. Capture rates were lower at 5 than at 11 °C, and the difference was most pronounced at high prey densities. At high prey densities, we also observed that European grayling had higher capture rates than brown trout. Type III functional response curves, i.e. sigmoidal relationships between capture rates and prey densities, fitted the data better than type I (linear) and II (hyperbolic) curves for all four combinations of temperatures and species. These results may explain the dominance of grayling in stream habitats with low water velocities and results such as these may be of use when developing foraging-based food web models of lotic ecosystems that include drift-feeding salmonids.
Place, publisher, year, edition, pages
London, UK: Taylor & Francis, 2014. Vol. 47, no 2, 93-99 p.
drift, feeding, foraging, food web, grayling, lotic, prey density, trout
Research subject Biology
IdentifiersURN: urn:nbn:se:kau:diva-32035DOI: 10.1080/10236244.2014.900210ISI: 000335822300003OAI: oai:DiVA.org:kau-32035DiVA: diva2:715684