RESUMO
In the Chantuto-Panzacola system, Chiapas, México, a study of a fish community was carried out between March and November of 1997. From a total of 1456 fish collected, 31 species, 25 genera and 19 families had been identified. The diversity and abundance were high in March with H'= 2.67 bits/ind, D = 3.89 sp/ind, biomass 1.88 g/m2. density 0.25 ind/m2 and average weight 7.55 g/ind. Significant differences were found between the ecological parameters and the environmental variables of the ecosystem in the months of study (ANOVA and Tukey, p < 0.05). The multiple discriminant analysis showed that the temperature and the salinity was the most important factors in the variation of the community. The frequency analysis and spatial distribution of the fish allowed to define fish assemblages formed by several groups of species that inhabits the system. Nine dominant species were defined for the ecosystem, representing the 71% in number and the 76.4% in weight of the total catch, Achirus mazatlanus, Caranx hippos, Cathorops fuerthi, Centropomus robalito, Cichlasoma macracanthum, Cichlasoma trimaculatum, Gobiomorus maculatus, Gobionellus microdon and Lile gracilis.
Assuntos
Ecossistema , Peixes/classificação , Animais , Biodiversidade , Biomassa , Peixes/fisiologia , Água Doce , México , Densidade Demográfica , Dinâmica Populacional , Estações do AnoRESUMO
Se presentan los resultados maternos hasta el mes post-parto de la evaluación tecnológica de tres modelos de atención del parto, con diferente nivel de complejidad, en 2313 gestantes de bajo riesgo obstétrico y similar nivel socio-económico, en Cali Colombia. Son estos resultados en conjunto con los del niño, objeto de otra publicación, los que determinan la escogencia del mejor modelo. Se hace énfasis en que las conclusiones comprende a modelos de atención en una población urbana y a muy corta distancia (5-10 minutos) del hospital de referencia