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ORIGINAL ARTICLES

Vertical distribution, feeding and vulnerability to tactile predation in Metridia longa (Copepoda, Calanoida)

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Pages 949-957 | Received 06 Aug 2012, Accepted 07 Feb 2013, Published online: 27 Jun 2013
 

Abstract

We assessed the vertical distribution and feeding of the calanoid copepod Metridia longa in the Oslofjord, Norway during winter and spring 2006. Adult females of Metridia longa inhabited the whole 200 m deep-water column. Their distribution was shallower at night than during the day. Enumeration of egested faecal pellets suggested that feeding activity was greater at night than during the day and that more pellets were produced by individuals collected at shallow depths vs. by individuals found deeper. There was no pronounced difference between months in feeding activity. Although the hypothesis is that they prey on Calanus eggs and nauplii, scanning of Metridia faecal pellets by PCR using Calanus-specific primers did not confirm the presence of any Calanus prey DNA. Most pellets had a greenish colour, implying herbivorous feeding. Feeding is related to swimming, and the actively swimming Metridia would presumably be vulnerable to tactile invertebrate predators. However, predation experiments where the carnivorous copepod Pareuchaeta norvegica was offered similar-sized Metridia and Calanus proved that Pareuchaeta consumed the less-active Calanus, but not the Metridia.

Published in collaboration with the Institute of Marine Research, Norway

Published in collaboration with the Institute of Marine Research, Norway

Notes

Published in collaboration with the Institute of Marine Research, Norway

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