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JOURNAL OF PLANKTON RESEARCH | VOLUME 7 | NUMBER 1 | PAGES 19-34 | 1985
© Oxford University Press

research-article

Un piège à emergence à collecteurs multiples pour l'ètude des migrations planctoniques verticales en milieu corallien

Jean Pierre Renon1,3, Maurice Dudemaine2 and et Jacques Drouet1

1Laboratoire d'Ecologie Animale et Zoologie, UER de Sciences Fondamentales et Appliquées, Université d'Orléans 45046 Orleans Cédex, France 2Laboratoire d'Electronique, Electrotechnique et Automatique, UER de Sciences Fondamentales et Appliquées, Université d'Orléans 45046 Orleans Cédex, France 3Antenne de Tahiti, Museum National d'Histoire Naturelle et Ecole Pratique des Hautes Etudes, Centre de l'Environnement BP 12, Mooréa, Polynésie Française

Received on October 1, 1983; accepted on September 1, 1984 A multisample emergence trap to study zooplankton vertical migrations is presented. It is equipped with 16 collectors, which are replaced one after another automatically with periods of 6, 11, 22, 45 or 90 mm, ad libitum. Technical information concerning the construction of this apparatus is provided; it is inexpensive to make and it can be operated by a single person. This trap is used in coral reefs to study upward migrations of zooplankton. Two series of collections (137 samples) including four and five successive diel cycles are summarised to illustrate this. Migration continues throughout the cycles; flow intensity is always highest during the night. Maximum flow intensity values for each taxon are very different from night to night. The variations of intensity show unimodal or bimodal trends; these trends change according to the taxons examined and in each taxon from day to day. The performance of this trap is similar to that of single-sample traps. The results obtained confirm only in part the classical pattern of plankton migration. The acquisition of longer series of data should help to reveal periodical phenomena other than diel cycles in the migratory variations.


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