Cascading effects of temperature alterations on trophic ecology of European grayling (Thymallus thymallus).

ABSTRACT: The aims of this project were to study: diet composition, food selectivity and the phenology of different prey items in grayling's (Thymallus thymallus) diet. It was hypothesized, that alterations in mayfly emergence, caused by reservoir-induced thermal changes, have consequences for trophic ecology of drift-feeding fish. Sampling of fish and macroinvertebrates were conducted in two closely located rivers, one human-modified and the other an undisturbed river. Grayling preyed mainly on aquatic insects, but only mayflies were preferred. Seasonal changes of the fish diet were observed, and air temperature is considered a predictor of prey occurrence with different time lags, depending on the biology of the organisms. Significant differences in the abundances and probability of mayfly occurre

SUBMITTER: Smolinski S 

PROVIDER: S-EPMC6892815 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature