Diel variations in Acartia tonsa feeding, respiration and egg production in a Mediterranean coastal lagoon |
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Authors: | Cervetto Guillermo; Gaudy Raymond; Pagano Marc; Saint-Jean Lucien; Verriopoulos Georges; Arfi Robert; Leveau Michel |
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Institution: | Centre d'Océanologie de Marseille, Station Marine d'Endoume rue de la Batterie des Lions, 13007 Marseille, France
1Centre de Recherches Océanologiques BP V18, Abidjan, CÔte d'Ivoire
2Zoology Laboratory, Athens University Athens, Greece |
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Abstract: | Short-term changes in abundance, feeding, respiration and spawningby the copepod Acartia tonsa were studied during four 24 h periodsat two stations in a Mediterranean lagoon in May and June of1989 and 1990. Nightly increases of abundance in the upper layer,attributed to nocturnal upward migration, were observed in threeout of the four time series. Nevertheless, occasional dailyincreases were observed too, so that no clear diel patternsin abundance could be defined. Contrarily, diel patterns seemedto appear: (i) for feeding (higher at the beginning of the night),based on gut fluorescence and clearance and ingestion rate measurements;(ii) for respiration (lower at night and based on 8 h incubationperiods); and (iii) for spawning (higher at the end of the night,based on experimental data). The origin of these patterns, aswell as their relationships to environmental data and theirpossible association, are discussed with regard to the availableliterature. |
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