Resumen del producto

The main objective of this work was evaluated the applicability of the indexes of average taxonomic distinctness base on presence/absence data (Delta+) and variation in taxonomic distinctness (Lambda+) , to the mollusk of soft bottom in a sector of cost north of the Batabanó Gulf. Two inventories of species were used based on historical surveys: one in 1980s surveys and other in 1998 survey. To check the robustness and effectiveness of these indexes as indicators of environmental stress were carried out correlations with the species richness and environmental variables. For the period evaluated were registered 110 species distributed in three classes (Bivalvia, Gastropoda and Scafopoda), 16 orders, 53 families and 91 genera. In 1980s surveys the Delta+ and Lambda+ values evidenced that the environmental conditions were favorable for the maintenance a high taxonomic diversity without detected environmental stress. In 1998 survey the values of these indexes diminished evidencing lost of taxonomic distinctness fundamentally in the class Bivalvia. Both indexes gave evidences of environmental stress in some places of this area for this year demonstrating to be effective and robust their used as biological indicator of human disturbances.

Palabras clave: Batabano Gulf; taxonomic distinctness; Soft bottom; Mollusk; Environmental degradation

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