Details

Autor(en) / Beteiligte

• SAEGROV, H
• HOBAEK, A
• L'ABDE-LUND, J. H

Titel

Vulnerability of melanic Daphnia to brown trout predation

Ist Teil von

• Journal of plankton research, 1996-11, Vol.18 (11), p.2113-2118

Ort / Verlag

Oxford: Oxford University Press

Erscheinungsjahr

1996

Link zum Volltext

Quelle

EZB-FREE-00999 freely available EZB journals

Beschreibungen/Notizen

• The co-existence of melanic Daphnia cf longispina and facultatively planktivorous brown trout is reported from a clear-water, alpine lake. This cooccurrence is uncommon, presumably due to the vulnerability of pigmented Daphnia to fish predation. Lake Bjornesfjorden (Norway) provided an opportunity to test this assumption. About 20% of the fish caught in gill nets had fed on Daphnia. The trout exerted a marked selection for large-sized Daphnia prey, and a very strong selection for pigmented individuals relative to transparent ones The persistence of a pigmented Daphnia population probably relies on limited recruitment and a low stock of the predator, and the availability of more favourable benthic prey organisms.