Abstract
Three cruises (DEM I, II and III) were conducted along the coast of Jalisco and Colima (Mexico) during three hydroclimatic seasons, defined by the pattern of the surface currents. Trawl samples were taken at seven sites along the coastline and four bathymetric levels (20, 40, 60 and 80 m). During the three cruises, 170 invertebrate species were identified. The crab Portunus xantusii affinis was the most abundant species: 62.6% during DEM I, 26.8% during DEM II and 42% during DEM III. The diversity (H′) estimated was moderate to low, of 1.93, 2.62 and 2.39 for the three cruises, respectively. No significant differences in diversity were observed among the three cruises and the differences in diversity among depths were only significant during DEM I. The minimum sample sizes for diversity and richness indicate that at least 20,422 organisms are needed to estimate diversity and 34,476 for richness.
Highlights
El conocimiento de la fauna bentónica en la región costera de Jalisco y Colima es más bien escaso y los pocos trabajos realizados están encaminados a conocer la composición de especies: peces (Aguilar-Palomino et al, 1996) y macroinvertebrados (Aguilar y Godínez-Domínguez, 1996; Ríos-Jara et al, 1996; García de Quevedo et al, 1997; Landa-Jaime et al, 1997; LandaJaime y Arciniega-Flores, 1997, 1998)
This study aims to analyze the diversity, dominance and richness of the invertebrate communities of the shrimp by-fauna and to determine their variation in the bathymetric gradient, during three hydroclimatic seasons in the area determined by the pattern of the surface currents
The predominant current pattern in the area is that described by Wyrtki (1965) for the eastern Pacific Ocean, consisting of three typical phases of circulation: the first is influenced by the California Current and is characterized by a cold water mass (February to April); the second is a transition stage where the California Current and North Equatorial Countercurrent converge, without either one dominating (May to June); and the third is a period influenced by the North Equatorial Countercurrent and characterized by a typically tropical water mass (August to January)
Summary
El conocimiento de la fauna bentónica en la región costera de Jalisco y Colima es más bien escaso y los pocos trabajos realizados están encaminados a conocer la composición de especies: peces (Aguilar-Palomino et al, 1996) y macroinvertebrados (Aguilar y Godínez-Domínguez, 1996; Ríos-Jara et al, 1996; García de Quevedo et al, 1997; Landa-Jaime et al, 1997; LandaJaime y Arciniega-Flores, 1997, 1998). Knowledge of the benthic fauna from the coastal region of Jalisco and Colima is scarce and the few available studies deal mainly with species composition: fishes (Aguilar-Palomino et al, 1996) and macroinvertebrates (Aguilar and Godínez-Domínguez, 1996; Ríos-Jara et al, 1996; García de Quevedo et al, 1997; Landa-Jaime et al, 1997; Landa-Jaime and Arciniega-Flores, 1997, 1998). Most of the studies are basically first approximations and of a descriptive nature
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