Visual predation by the euphausiid Meganyctiphanes norvegica

Experiments showed that Meganyctiphanes norvegica are visual predators on copepods. Adult M. norvegica were offered a mixture of equal numbers of late stage Calanus spp. and Metridia longa in total darkness and at a light intensity corresponding to their daytime habitat. Predation rates were 3 times...

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Bibliographic Details
Published in:Marine Ecology Progress Series
Main Author: Torgersen, Thomas
Format: Article in Journal/Newspaper
Language:English
Published: Inter-Research 2001
Subjects:
pelagic fish
pelagisk fisk
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Aquaculture: 922
Meganyctiphanes norvegica
Copepods
Online Access:http://hdl.handle.net/11250/108615
https://doi.org/10.3354/meps209295
Description
Summary:Experiments showed that Meganyctiphanes norvegica are visual predators on copepods. Adult M. norvegica were offered a mixture of equal numbers of late stage Calanus spp. and Metridia longa in total darkness and at a light intensity corresponding to their daytime habitat. Predation rates were 3 times higher in the illuminated containers than in the dark ones (7 vs 2.3 copepods krill-1 18h-1), and higher on M. longa than on Calanus spp. in both light (1.3 times) and darkness (2.3 times). Swimming speeds of M. longa were about 10 times faster than those of Calanus spp., making M. longa more susceptible to mechanical detection.

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