info:eu-repo/semantics/article
Fish assemblages in pampean streams (Buenos Aires, Argentina): Relationship to abiotic and anthropic variables
Fecha
2020Registro en:
Paracampo, Ariel Hernán; Marrochi, María Natalia; Garcia, Ignacio Daniel; Maiztegui, Tomás; Carriquiriborde, Pedro; et al.; Fish assemblages in pampean streams (Buenos Aires, Argentina): Relationship to abiotic and anthropic variables; Academia Brasileira de Ciencias; Anais da Academia Brasileira de Ciencias; 92; 2; 2020; 1-17
0001-3765
1678-2690
CONICET Digital
CONICET
Autor
Paracampo, Ariel Hernán
Marrochi, María Natalia
Garcia, Ignacio Daniel
Maiztegui, Tomás
Carriquiriborde, Pedro
Bonetto, Carlos Alberto
Mugni, Hernan Diego
Resumen
The study reported here assesses the effect of natural and anthropic environmental variables on the fish assemblages in the pampean streams, in the coastal strip along the Río de la Plata, Buenos Aires province, Argentina. Five streams were sampled at 12 sites surrounded by land devoted to different uses. A correspondence analysis sorted the streams into two groups: a less impacted group formed by sites surrounded by livestock- raising pastures and a more impacted one passing through urban sites and including a stream adjacent to a modest rural urbanization plus a dairy in the stream´s basin. The nutrient concentrations were significantly higher in the more impacted group; with species richness, diversity, abundance, and biomass being significantly lower. A canonical-correspondence analysis related the more impacted sites to high concentrations of soluble reactive phosphorus and impoverished fish assemblages, composed of species tolerant to environmental pollution. By contrast, sites with higher oxygen concentrations and pH were related to richer assemblages pointing to good environmental conditions at the sites surrounded by livestock-raising pastures. The downstream sites on the less impacted streams contained fish assemblages in which the juvenile stages of species corresponding to the Río de la Plata were dominant.