Population dynamics and secondary production of Scolelepis squamata (Polychaeta: Spionidae) in an exposed sandy beach of southern Brazil
Abstract:Scolelepis squamata is a common component of sandy beach environments. It is the most abundant species on some Brazilian intertidal beaches, but little is known about its population dynamics and secondary production. The distribution, population dynamics and secondary production of this species on Atami Beach (Southern Brazil) was studied from February 1992 to February 1993. The organisms were concentrated in a narrow band along the middle intertidal beach, reaching mean maximum densities of 20,277 m−2. Ovigerous females were present throughout the year with the highest percentages in February and August. Two peaks of recruitment were identified, one in April and the other in October. This population produced two identified cohorts during the year. The life span was of 0.66 and 0.49 yrs, and the mortality was 2.52 and 5.52 y−1, for each cohort respectively. Mean annual biomass was 0.21 g m−2 (AFDW), and mean annual production was 0.57 g m−2 y−1 (AFDW). The P/B ratio was low, 2.70 y−1, in particular when compared with species of similar life span. Data suggested that this species presented r-strategist characteristics (sensu McArthur), with a short life span, great reproductive effort, and an opportunistic behavior.
Document Type: Research Article
Publication date: 2000-07-01
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