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Spatial distribution, density and population structure of the Cortes geoduck, Panopea globosain the Central Gulf of California

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Relationship between zooplankton biomass and continental water discharges in the southern Gulf of Mexico (1984-2001)

Seasonal shift in the taxonomic diversity of rocky reef fishes in the southwestern Gulf of California

Authors

CORRESPONDING

Jesús Rodríguez-Romero

jrodri@cibnor.mx

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2

Centro de Investigaciones Biológicas del Noroeste (CIBNOR), Apdo. Postal 128, La Paz, Baja California Sur, C.P. 23000, México

Emelio Barjau-González

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1

Departamento Académico de Ciencias Marinas y Costeras, Universidad Autónoma de Baja California Sur (UABCS), Apdo. Postal 19, La Paz, Baja California Sur, C.P. 23080, México

Felipe Galván-Magaña

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Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas, Av. IPN s/n. La Paz, Baja California Sur, México. C.P. 23000 México

Minerva Maldonado-García

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2

Centro de Investigaciones Biológicas del Noroeste (CIBNOR), Apdo. Postal 128, La Paz, Baja California Sur, C.P. 23000, México

Abstract

The southwestern Gulf of California has high-value commercial fisheries; however, there are few studies of the taxonomic diversity of fish in this area. Surveys of taxonomic diversity of the fish assemblage at 8 localities near the shore of Bahía de La Paz were undertaken from March 2002 to April 2003. Seasonal changes in diversity of rocky reef fish were analyzed, including taxonomic distance among fish species, using the alpha, alpha average, beta, and gamma diversity indices, the taxonomic distinctness index (TD D*), and the average taxonomic distinctness index (AvTD D+). Submarine visual censuses were carried out along 48 transects measuring 100 × 5 m (500 m2) at 5 m average depth from 09:00-16:00 h. Two seasons were studied: winter with an average temperature of 22.57°C, and summer with an average temperature of 27.09°C. 24,633 fishes, belonging to 92 species and 67 genera were recorded. According to the alpha average, beta, and gamma diversity indices, August had the highest diversity (19.5, 40.5, and 60 species, respectively), and December had the lowest diversity (20.6, 27.4, and 48 species, respectively). Spatial analysis of TD and AvTD were not significantly different, and analysis by season of these indices was not significant different. Greater anthropogenic impact would cause differences in TD and AvTD found at El Guano compared with other locations.

Key words

Taxonomic diversity, reef fish, Gulf of California

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