Abstract
The population structure and dynamics of Orchestia montagui Audouin, 1826 (Crustacea: Amphipoda: Talitridae) were studied from the supralittoral zone of Bizerte lagoon for 1 year. Monthly field surveys were performed from July 2006 to June 2007. Individuals sampled were categorized by sex, size and abundance on each sampling date. Abundance varied during the study period, with a noticeable decrease in November. Ovigerous females were found throughout the year. The sex ratio changed throughout the year but, overall, the population was male biased. Analysis of the size frequency polymodal distribution suggested the presence of six cohorts on the first sampling date and 10 new ones during the next 11 months. Lifespan was estimated at 6–7 months. Cohorts born in summer and autumn tend to live longer than those born in winter. At this study site, O. montagui appeared as a semiannual species, with iteroparous females producing at least two broods, and exhibited a bivoltine life cycle.
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