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Free Content Morphodynamical Influence of a Temporary Freshwater Stream on the Population Dynamics of Scolelepis Gaucha (Polychaeta: Spionidae) on a Sandy Beach in Southern Brazil

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The influence of a temporary freshwater stream on the population dynamics of the polychaete Scolelepis gaucha (Orensanz and Gianuca 1974), was studied on a high energy sandy beach in southern Brazil. A 40-m transect, which was subjected to the stream's influence, was surveyed biweekly from 17 August to 27 October 1988. A reference transect was also sampled both during and after the stream discharge period. Differences in recruitment and mortality patterns were detected between transects which were not related with the salinity differences in the pore water. In the stream area, erosion seems to be the main structuring factor of the S. gaucha population, due to changes in the beach profile gradient. This meso scale effect suggests that beach morphodynamics play a very important role in the survival of the different cohorts and may well explain the association between community structure and energy exposure.

Document Type: Research Article

Publication date: 1991-05-01

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  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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