| Summary: | 5 pages, 2 figures [EN] A statistical technique, time series analysis, has been introduced allowing the detection of cycles both in copepod populations and sexual proportion, as well as the split of this cycle as a consequence of two mechanisms: the positive correlation between male proportion and the population desity 30 days later and the negative one between population density and the male proportion after 15 days. [.] Calanus finmarchicus, Acartia italica [FR] Les populations naturelles de cópepodes monstren très souvent des fluctuations dans leur proportion sexuelle, pouvant occasionnellement se relationer avec des varitions de la densité des populations, ce qui suggère qu'il peut s'agir d'une mécanisme homéostatique qui permet á la population de controler d'une certaine façon, son propre développement. [.] Peer reviewed
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