Abstract
For 15 months, the composition and abundance of drift vegetation were determined from a plantdominated fringing reef at Galeta Point, Caribbean Panama. Five nets located downstream of the reef platform continuously sampled 1.0–1.3 ha of reef flat which included 137–202 m of fore reef. Time series and multiple correlation analysis were done to evaluate the dependence of drift biomass on selected physical and biological factors. Export and import rates and turnover times were derived and compared between the dominant species. Floating leaves, branches, and seeds of higher plants were the major components of imported drift with 52% of the dry weight mass, followed by algae and seagrass each with 19%, the water hyacinth Eichhornia with 2%, and floating tar with 8%. Exported biomass from the reef platform was higher in the dry-season (late November–March) than in the wet-season (April-early November). Within the 1.0–1.3 ha sampling area, export estimates ranged from 37–294 kg mo-1 for the seagrass Thalassia, 3–171 kg mo-1 for the alga Laurencia, and 3–74 kg mo-1 for the alga Acanthophora. Multiple correlation models indicated that meteorological and hydrographic conditions explained between 31 to 65% of the variance in the drift biomass and that the best predictors of exported biomass were tidal elevation and wind speed (3 week lag). Export rates increased with high tides and strong winds and decreased with elevated water temperatures. Autocorrelations of drift biomass were generally highest at 2 week intervals, suggesting that the quantity of drift removed from the platform was, in part, related to spring and neap tide cycles. Export rates were also affected by the morphology of the vegetation, development of uprights, and location on the reef platform. Import rates of terrestrial-plant debris, the hyacinth Eichhornia, the seagrass Syringodium, and the brown alga Sargassum did not exhibit pronounced seasonal patterns in abundance and averaged 60.2, 1.9, 1.1, and 2.7 g d-1m-1, respectively. Wind speed was negatively correlated with Sargassum abundance, suggesting that strong winds depleted it from nearshore waters. Floating tar averaged about 10 g d-1m-1, the highest reported in the Caribbean. The plant-dominated fringing reef at Galeta Point is shown to be a major source, as well as a recipient, of drift vegetation.
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Kilar, J.A., Norris, J.N. Composition, export, and import of drift vegetation on a tropical, plant-dominated, fringing-reef platform (Caribbean Panama). Coral Reefs 7, 93–103 (1988). https://doi.org/10.1007/BF00301647
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DOI: https://doi.org/10.1007/BF00301647