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Meiofauna associated with a Pacific coral reef in Costa Rica

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Abstract

The meiofauna of two coral reef habitats at Isla del Naño, Costa Rica was studied over a one year period. The dominant groups were: Foraminifera (21.2%), Copepoda (19.7%), Nematoda (19.1%), Gastropoda (16.5%), Polychaeta (7.2%) and Bivalvia (6.6%). The highest diversity was found in coarse, heterogeneous sands with the highest percentage of carbonates. The meiofauna showed a high degree of horizontal aggregation, which is a characteristic pattern for macro- and meiofauna in sediments of variable composition. No vertical variation in distribution was evident, probably due to the deep location of the Redox Potential Discontinuity layer. The total densities of organisms found in this study (99 to 575 ind/10 cm2) are low compared with densities in similar non-reefal sands (7 to 6116), and from fine sediments (80 to 17 000), but are comparable to densities found in other reef areas (39 to 609.5 ind/10 cm2). This is the first report on meiofauna from the eastern Pacific, and the first time that foraminiferans are the dominant group.

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Author notes

  1. Héctor M. Guzmán

    Present address: Smithsonion Tropical Research Institute, P.O. Box 2072, Balboa, Panamá

Authors and Affiliations

  1. Escuela de Biología and CIMAR, Universidad de Costa Rica, San Pedro, Costa Rica

    Héctor M. Guzmán, Vilma L. Obando & Jorge Cortés

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  1. Héctor M. Guzmán
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  2. Vilma L. Obando
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  3. Jorge Cortés
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Guzmán, H.M., Obando, V.L. & Cortés, J. Meiofauna associated with a Pacific coral reef in Costa Rica. Coral Reefs 6, 107–112 (1987). https://doi.org/10.1007/BF00301379

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