Abstract
We evaluated the duration of Copepodite Stages C1 to C6, the biological cycle and the number of annual generations of the planktonic copepod Acartia clausi in a meso-oligotrophic area of the eastern Mediterranean Sea (Saronikos Gulf, Greece). The results were based on 95 zooplankton samples collected during the period November 1988 through June 1990, at intervals of 1, 2, 7 and 15 d, the sampling intervals being dependent on the abundance of A. clausi. Time-series analysis (cross-correlation) of fluctuations in the comparative abundance (percentages) of the copepodite stages present was used to determine the duration of the development stages and generation length. This methodology could significantly contribute to the identification of cohorts, and hence to the estimation of stage duration, from field data for a given copepod species. The development of A. clausi stages was not isochronal; duration of the first copepodite stage was shorter than that of the last three stages. The mean generation length estimated (28.6 d) is among the highest recorded in the literature for A. clausi at the range of temperatures prevailing in the area (13 to 25°C). Throughout the year there were four or five generations. The possible limiting role of food availability on the duration of each stage and hence on generation length is also discussed.
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Communicated by J. M. Pérès, Marseille
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Christou, E.D., Verriopoulos, G.C. Analysis of the biological cycle of Acartia clausi (Copepoda) in a meso-oligotrophic coastal area of the eastern Mediterranean Sea using time-series analysis. Marine Biology 115, 643–651 (1993). https://doi.org/10.1007/BF00349372
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DOI: https://doi.org/10.1007/BF00349372