Numbers of the great crested grebe, Podiceps cristatus L., and the composition of its food in the Dobczyce Reservoir [the River Vistula Basin, Southern Poland]

• Autorzy: Gwiazda R
• Języki publikacji: EN

Abstrakty

EN

The highest density of the great crested grebe in the Dobczyce Reservoir was observed in autumn. In the littoral zone the grebes chiefly stayed during the breeding period. In the stomachs of these birds 6 fish species were found, the most frequent occurrence being perch, Perca fluviatilis L. The total length of the consumed fish ranged from 6 to 18 cm. Also insects and additionally bivalves and plant fragments were eaten. In the aspect of the biomanipulation concept, by consuming planktivorous fish this species reduces their pressure on the zooplankton, thereby contributing to the control of algal blooms.

PL

Perkoz dwuczuby osiągał największe zagęszczenia na Zbiorniku Dobczyckim w okresie jesiennym. W strefie litoralu perkozy przebywały przede wszystkim w okresie lęgowym. W żołądkach perkozów stwierdzono 6 gatunków ryb, z których najliczniejszy był okoń. Długość całkowita zjadanych ryb wynosiła 6-18 cm. Stwierdzono również zjadanie owadów oraz dodatkowo małży i części roślin. W świetle koncepcji biomanipulacji gatunek ten wyjadając ryby planktonożerne zmniejsza ich presję na zooplankton, a tym samym przyczynia się do ograniczania zakwitów glonowych.

Słowa kluczowe

EN

Dobczyce Reservoir; dam reservoir; Poland; consumption; food; grebe; biomanipulation; hydrobiology; Vistula River; freshwater fish; Podiceps cristatus; great grebe; composition

• Wydawca: -
• Czasopismo: Acta Hydrobiologica
• Rocznik: 1995
• Tom: 37
• Numer: 4
• Opis fizyczny: p.205-212,fig.

Twórcy

autor

Gwiazda R

• Polish Academy of Sciences, Slawkowska 17, 31-046 Krakow, Poland

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