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| Etude, en milieu naturel, du comportement migratoire nycthéméral du copépode Acartia tonsa, Dana 1849 |
| Patriti, G. (1989). Etude, en milieu naturel, du comportement migratoire nycthéméral du copépode Acartia tonsa, Dana 1849 Mar. Nat. 2(1): 19-29 |
| In: Marine Nature. Marine Science Institute, Yeungnam University: Kyongsan. ISSN 1225-990X, meer |
| Abstract |
Zooplanktonic community of the brackish pound "Etang de Berre" near Marseilles is made of 97% of Acartia tonsa population. This copepoda was recently signalized for the first time in the Mediterranean. The study of migratory behaviour of this species was carried out during a continuous daily cycle. The migratory exchanges between the different levels are not limited to the sunset migration brings individuals from which intermediate levels to the surface. During the daily cycle appears an evolutionary behaviour. This behaviour would result of a change of the A tonsa phototaxis in account with values of the illumination (variation and threshold). Some values of illumination would regularly spread the organisms in the environment. The most important upward migration occurs at sunset for the threshold value of 0,5µW. cm -2. |
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