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Planktonic cnidarian distribution and feeding of Pelagia noctiluca in the NW Mediterranean Sea
Sabatés, A.; Pagès, F.; Atienza, D.; Fuentes, V.L.; Purcell, J.E.; Gili, J.-M. (2010). Planktonic cnidarian distribution and feeding of Pelagia noctiluca in the NW Mediterranean Sea, in: Purcell, J.E. et al. (Ed.) (2010). Jellyfish blooms: New problems and solutions. Developments in Hydrobiology, 212: pp. 153-165
In: Purcell, J.E.; Angel, D.L. (Ed.) (2010). Jellyfish blooms: New problems and solutions. Developments in Hydrobiology, 212. Springer: Dordrecht. ISBN 978-90-481-9540-4. 234 pp., more
In: Dumont, H.J. (Ed.) Developments in Hydrobiology. Kluwer Academic/Springer: Den Haag. ISSN 0167-8418, more

Also published as
  • Sabatés, A.; Pagès, F.; Atienza, D.; Fuentes, V.L.; Purcell, J.E.; Gili, J.-M. (2010). Planktonic cnidarian distribution and feeding of Pelagia noctiluca in the NW Mediterranean Sea. Hydrobiologia 645(1): 153-165, more

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Keyword
    Marine

Authors  Top 
  • Sabatés, A.
  • Pagès, F., more
  • Atienza, D.
  • Fuentes, V.L.
  • Purcell, J.E.
  • Gili, J.-M.

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 inshore-offshore 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 shelf-slope 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 co-occurrence of P. noctiluca with early life stages of fish suggests that P. noctiluca may be an important predator on summer ichthyoplankton.

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