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Title of Journal: Hydrobiologia

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Abbravation: Hydrobiologia

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Springer Netherlands

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DOI

10.1016/0040-6090(93)04181-q

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ISSN

1573-5117

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Planktonic cnidarian distribution and feeding of

Authors: Ana Sabatés Francesc Pagès Dacha Atienza Verónica Fuentes Jennifer E Purcell JosepMaría Gili
Publish Date: 2010/04/03
Volume: 645, Issue: 1, Pages: 153-165
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Abstract

Pelagic cnidarians are important consumers of zooplankton and ichthyoplankton in the world’s oceans and thus harm fisheries as competitors and predators of fish This study examined the inshoreoffshore distribution of pelagic cnidarians and the trophic ecology of Pelagia noctiluca ephyrae 12 mm diameter and larger medusae in late spring 1995 in the NW Mediterranean Sea The distribution of pelagic cnidarians was closely related to the presence of the shelfslope front with most species mainly concentrated close to the front Meroplanktonic antho and leptomedusae predominated in coastal waters and more holoplanktonic trachy and narcomedusae occurred both in shelf and open sea waters P noctiluca was more abundant than other medusae including hydromedusae Siphonophores particularly Muggiaea atlantica outnumbered medusae at most stations The diet of P noctiluca ephyrae contained mainly copepods but ~12 of the prey were fish larvae P noctiluca exhibited positive prey selection for chaetognaths and mollusc larvae in day and night samples but fish larvae were positively selected only at night These differences may be related to the diel vertical distributions of P noctiluca and their prey Most of the ingested fish larvae belonged to the family Myctophidae but anchovy and sparid larvae also were found in the gastric pouches The size of ingested fish larvae increased as ephyra diameter increased however in the larger medusae 12 mm the number of prey increased with medusa size rather than the size of the larvae The temporal and spatial cooccurrence of P noctiluca with early life stages of fish suggests that P noctiluca may be an important predator on summer ichthyoplanktonWe greatly appreciate the assistance of the crew of the R/V García del Cid and all the participants during the “FRONTS” cruise We thank Dr T K Doyle for constructive comments on an earlier version of the manuscript This study was supported by the projects AMB940853 and REN 200201339/MAR

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