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Volume 45 - Number 2 - 2010


Reef fish assemblages and their relation with the benthic habitat of Isabel Island, Nayarit, México

Cristian M. Galván-Villa1, José L. Arreola-Robles2, Eduardo Ríos-Jara1 y Fabián A. Rodríguez-Zaragoza1


1Laboratorio de Ecosistemas Marinos y Acuicultura, Departamento de Ecología, Centro Universitario de Ciencias Biológicas Agropecuarias, Universidad de Guadalajara, Carretera a Nogales Km. 15,5, Las Agujas Nextipac, Zapopan CP 45110, Jalisco, México

2Instituto Tecnológico de Monterrey, Campus Guadalajara (ITESM-GDL), Av. General Ramón Corona #2514, Col. Nuevo México, Zapopan CP 45201, Jalisco, México




This study describes the reef fish assemblages of Isabel Island and their relation with the benthos heterogeneity. A total of 39 visual transects from 19 different localities were performed in the zones North, South, East, and West around the island during December 2002, October 2004, and April 2005. The species composition and their abundance were registered in each transect. Video-transects were also performed to estimate the cover of benthic morpho-functional groups. A total of 9,956 specimens of fishes belonging to 118 species, 85 genera, and 51 families were registered. The 58.3% of the species have biogeographic affinity to the Panamic province. Six endemic species of the Mexican Pacific were registered, including two species endemic to the Gulf of California. According to the biological value index seven species were dominant in the island: Thalassoma lucasanum, Prionurus punctatus, Stegastes flavilatus, Halichoeres dispilus, Acanthurus xanthopterus, Abudefduf troschelii, and Johnrandallia nigrirostris. The indexes of diversity and evenness were not significantly different between the four zones of the island. However, there was a relation between the zones with higher biodiversity (South and East) and some components of the benthic habitat. The principal component analysis found that the cover of corals and rocks are highly related with the dominant species of the island, while the zones with highest proportion of sand, sponges, and gorgonians have less influence on fish diversity


Key words: Ichthyofauna, diversity, abundance, biogeography, Gulf of California



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