The food of bream (Abramis brama L.) in two basins of Lake Balaton of different trophic status

Contrary to earlier observations the food composition of bream (Abramis brama ) in Lake Balaton has changed in paralled with eutrophication. These changes were probably caused by increased population density and connected with density dependent growth as well as sharpened inter- and intraspecific co...

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Published in:Hydrobiologia 1991-02, Vol.209 (1), p.51-58
Main Authors: BIRO, P, SADEK, S. E, PAULOVITS, G
Format: Article
Language:English
Subjects:
Abramis brama
Agnatha. Pisces
Animal and plant ecology
Animal, plant and microbial ecology
Animals
Autoecology
Biological and medical sciences
Freshwater
Fundamental and applied biological sciences. Psychology
Vertebrata
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description Contrary to earlier observations the food composition of bream (Abramis brama ) in Lake Balaton has changed in paralled with eutrophication. These changes were probably caused by increased population density and connected with density dependent growth as well as sharpened inter- and intraspecific competition in the cyprinid community. Zooplankton, followed by benthic invertebrates comprised the majority of the bream's food. By weight, however, benthic food dominated in both basins. Size-related dietary changes were pronounced, but statistically not always significant, suggesting the overall importance of the most abundant and available prey types. Bream did not strongly select any of the zooplankton groups. Seasonal changes in food composition alternated in parallel with the trophic gradient along the longitudinal axis of the lake.
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subjects Abramis brama
Agnatha. Pisces
Animal and plant ecology
Animal, plant and microbial ecology
Animals
Autoecology
Biological and medical sciences
Freshwater
Fundamental and applied biological sciences. Psychology
Vertebrata
title The food of bream (Abramis brama L.) in two basins of Lake Balaton of different trophic status
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