Resumen del producto

Abundance and diversity of copepod community structure were studied at a fixed station in the Bahía de La Paz between October 2002 and February 2004; during ten days in seven sampling campaigns the copepod community was sampled in order to analyze their variation in relation to sea surface temperature and chlorophyll-a concentration. Adult copepods were identified and numbered standardizing to 100 m³ filtered water. From 66 zooplankton samples 71 copepod species were identified. Rank abundance varied between 38,341 and 263,550 indiv·100 m^-3. The most frequent and abundant species were Centropages furcatus, Subeucalanus mucronatus and Undinula vulgaris. Species richness was highest in January 2003 (10–31), and highest species diversity in October 2002 (0.6–1.1 bits/ind). Species richness showed a negative trend from June 2003 on, in contrast to diversity, indicating an evenness of species abundance and a relatively stable community. The community structure and species richness were negatively correlated to chlorophyll-a concentration; diversity of copepods increased slightly with increased sea surface temperature. From June 2003 on, copepod abundance declined, and showed no apparent relationship with se temperature or chlorophyll-a concentration. Future analyses need to involve additional variables as well as vital rates of dominant species in order to explain our findings.

Palabras clave: copepod community; diversity; Bahía de La Paz

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