Demersal fish assemblages of the continental shelf off Colima and Jalisco, Mexico (spring, 1995)

Abstract

The structure of the soft-bottom demersal fish assemblages of the continental shelf off Jalisco and Colima, Mexico, was studied in an area of 410 km2. The classification of the 32 most abundant species resulting from the cluster analysis shows eight groups (three from the inner shell; four from the intermediate shelf and one from the slope shelf). The ordination through detrended correspondence analysis (DCA) defined seven units; the affinity and composition of these units were similar to that of the other technique. The multiple contrasts of the analysis of variance, using the depth/temperature/salinity scores, were significantly correlated with the group of stations and with the eigenvalues calculated for the species with the DCA. This confirms the presence of a bathymetric/thermic gradient and that the shallow thermocline has a segregation effect on the demersal assemblages of soft-bottom fishes.

Fish assemblage and environmental patterns in the Rı́o de la Plata estuary

“…Hierarchical classification methods to define fish assemblage areas have been used to map and identify fish communities (Colvocoresses & Musik, 1984;Gabriel, 1992;Gomes, Haedrich, & Rice, 1992;Gomes, Haedrich, & Villagarcia, 1995;Ishino, Iwassaki, Otsuka, & Kihara, 1983;Mahon et al, 1998;Mahon & Smith, 1989;Mariscal-Romero et al, 1998;de Mello, Castello, & Freire, 1992;Menni & Gostonyi, 1982;Menni & Lo´pez, 1984;Menni & Stehmann, 2000;Prenski & Sa´nchez, 1988;Tyler et al, 1982).…”

Reproductive biology of the bullseye puffer Sphoeroides annulatus: Gonadosomatic index and its suitability for estimating length at maturity

“…Juvenile specimens inhabit estuaries, but they can be found in marine to brackish waters due to their osmoregulatory ability. After maturity, depth range of S. annulatus varies from 10 to 60 m (Mariscal‐Romero, 1998). The species is harvested in the north‐west Mexican Pacific Ocean, mainly off the Baja California Sur and Sinaloa coasts.…”