Distribution of benthic macroinvertebrates in Subtropical streams (Rio Grande do Sul, Brazil) Distribuição de macroinvertebrados bentônicos em riachos Subtropicais (Rio Grande do Sul, Brasil)

Content Provider	Semantic Scholar
Author	Biasi, Cristiane
Copyright Year	2009
Abstract	Aim: The aim of this study was to evaluate the spatial and seasonal distribution of the benthic macroinvertebrates community in streams in the north region of Rio Grande do Sul State; Methods: The samplings were carried out in nine streams, in annual seasons. The organisms were collected with a Surber sampler (250 µm mesh; area: 0.1 m²). Environmental variables were measured to verify influences in the benthic community using a Canonical Correspondence Analysis. To evaluate the differences among communities, density, richness, diversity and evenness an ANOVA was used. To compare benthic fauna composition a MANOVA was used; Results: The environmental variables showed significant differences among the streams; however the seasons not differ. The density of organisms was significantly different among the streams and the diversity was different among the seasons. Richness and evenness not showed spatial-seasonal differences. The canonical correspondence analysis explained 67.4% of the data total variability. The main variables that influenced the benthic community were the nutrients contents, pH, electric conductivity and substrate organic matter; Conclusions: Streams with riparian vegetation and lower contents of dissolved nutrients showed higher richness of intolerant organisms to pollution. The results suggest that the distribution of benthic macroinvertebrates in the studies region was mainly related to anthropic activities developed in the catchment.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://www.ablimno.org.br/acta/pdf/acta_v21n4_210407.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article