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Aunque gran parte de los arrecifes y comunidades coralinas del Pacifico oriental han sido bien estudiados, aun existe un notable desconocimiento sobre la ocurrencia, distribucion y composicion faunistica de aquellos que se encuentran en la costa occidental de Mexico. Aunado al problema anterior, el margen costero de esta region esta siendo objeto de grandes modificaciones antropogenicas que pueden afectar de manera irreversible a las comunidades coralinas locales. El presente trabajo tiene como objetivo el de describir la estructura y distribucion de los principales arrecifes y comunidades coralinas de la region costera en el estado de Nayarit (20-21oN). Los resultados del estudio indican que estas zonas presentan una alta riqueza especifica y una zonacion clara, pero baja diversidad y uniformidad, principalmente debido a la dominancia de Pocillopora damicornis (L.) en las localidades. Debido a los efectos conjuntos de la pequena area de plataforma continental colonizable por corales, la relativamente baja transparencia del agua y la presencia de una termoclina muy somera, todos los arrecifes observados en el sur de Nayarit son angostos, del tipo de franja. Las barreras fisiograficas e hidrologicas en la region, como las desembocaduras de rios y amplias marismas al norte, y el efecto de las surgencias al sur, dan lugar a una distribucion disjunta de las zonas de desarrollo arrecifal en la costa de Nayarit, limitandose a una seccion de costa rocosa de unos 130 km de longitud.  Although most of the reefs and coral communities of the eastern Pacific have been well studied, there is still great ignorance regarding the occurrence, distribution and faunistic composition of those on the western coast of Mexico. Moreover, the coastal margin of this region is being subjected to great anthropogenic modifications that may irreversibly affect the local coral communities. The present study has the objective of describing the structure and distribution of the main coral reefs and coral communities in the coastal region of the state of Nayarit (20-21oN). The results indicate that these zones are characterized by a high specific richness and a clear zonation, but with low diversity and uniformity, principally due to the dominance of Pocillopora damicornis (L.) in these localities. Because of the combined effects of the small continental shelf area that can be colonized by corals, the relatively low water transparency and the presence of a very shallow thermocline, all the coral reefs observed in southern Nayarit are narrow fringing reefs. The physiographic and hydrologic barriers in the region, such as river mouths and ample marsh areas to the north, and upwelling effects in the South, give place to a disjunct distribution of the zones of coral reef development on the Nayarit coast, limiting their distribution to a rocky coastal section of about 130 km in length.

Community structure and geographic distribution of the coral reefs of nayarit, mexican pacific