Resumen del producto

The objective of this study is to evaluate the applicability of the indexes of average taxonomic distinctness on base of presence/absence of data (Delta+) and variation in taxonomic distinctness (Lambda+) of the soft bottom molluscs of a sector of north coast of the Batabanó Gulf. Two inventories of species were used based on historical surveys: one in 1980 and other in 1998. 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 Scaphopoda), 16 orders, 53 families and 91 genera. In 1980 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 to be used as biological indicator of human disturbances.

Palabras clave: molluscs; Batabano Gulf; taxonomic distinctness; biological indicator

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