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Feeding mechanism of Pelagia noctiluca (Scyphozoa: Semaeostomeae); laboratory and open sea observations

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Abstract

The behaviour of the oral arms of Pelagia noctiluca (Forsskål) has been investigated in open sea predation and in predation induced both in the laboratory and the natural environment. Specimens were first studied in the field and then collected from coastal aggregations in the Gulf of Trieste, North Adriatic Sea, in December 1985 (Lat. 13°40′ E, Long. 45°42′ N) and in June 1986 (Lat. 13°39′ E, Long. 45°43′ N). The results of laboratory experiments and in situ observations, recorded on videotapes and photographs, show that the marginal tentacles are utilized to: (1) paralyze the prey; (2) contract and bend inward towards the nearest oral arm. Occasionally the tentacle does not contract and the prey is released; thus prey selection may occur. The oral arms are therefore involved in the: (1) transport of prey from the tentacle to the gastric cavity; (2) catching of motionless prey; (3) anchoring the medusa to the substratum. A similar feeding pattern can explain the survival of several specimens of P. noctiluca near the bottom during the winter of 1985/1986 in the Gulf of Trieste (North Adriatic Sea) in spite of the severe climatic conditions.

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Authors and Affiliations

  1. Department of Biology, University of Trieste, Via Valerio 32, 34127, Trieste, Italy

    L. Rottini Sandrini & M. Avian

  2. Laboratory of Marine Biology, Centro Internazionale Mediterraneo Ambiente Meduse (C.I.M.A.M.), Via Valerio 32, 34127, Trieste, Italy

    L. Rottini Sandrini & M. Avian

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  1. L. Rottini Sandrini
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  2. M. Avian
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Communicated by M. Sarà, Genova

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Sandrini, L.R., Avian, M. Feeding mechanism of Pelagia noctiluca (Scyphozoa: Semaeostomeae); laboratory and open sea observations. Marine Biology 102, 49–55 (1989). https://doi.org/10.1007/BF00391322

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