Abstract

PINZON, Jorge H.; PERDOMO, Adriana M.  and  DIAZ, Juan M.. ISLA ARENA, A HEALTHY CORAL FORMATION IN THE AREA INFLUENCED BY THE SEDIMENT PLUME OF THE MAGDALENA RIVER, COLOMBIAN CARIBBEAN CONTINENTAL SHELF. Bol. Invest. Mar. Cost. [online]. 1998, vol.27, n.1, pp.21-37. ISSN 0122-9761.

The morphology, composition and structure of the coral community developed around Isla Arena, a tiny shingle cay located on the central area of the Caribbean continental shelf of Colombia, are described. Based on aerial photographs from the area and field surveys, maps of bottom relief, habitat units according to substrate type and cover of dominating sessile biota, wave exposure, and patterns of wave dispersion and refraction were drawn. Employing an underwater videocamera, 10 m-long transects chain were recorded and analized using the plotless method in order to characterize the sessile community structure. A total of 33 species compose the benthic community. Of these, 14 species are stony corals, 5 zoanthids, 1 octocoral, 1 anemone, 10 are macroalgae and 2 sea grasses. Ten ecological zones were identified, each of them dominated by one or more species. The spatial distribution pattern of the zones is mainly controlled by substrate and wave energy. The few coral species found seemed to be particularly adapted to meet the prevailing sub-optimal conditions (high water turbidity and turbulence). Furthermore, their healthy condition suggests that scleractinians growing under chronic stress may also to cope with infestation by common coral diseases when they are continuously subjected to natural stress.

Keywords : Corals; Sedimentation; Arena Island; Colombian Caribbean.

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