Benthic macroinvertebrate community in the Sinos river drainage basin, Rio Grande do Sul, Brazil.

M P Barros,L M Gayeski,J G Tundisi

doi:10.1590/1519-6984.04815

M P Barros, L M Gayeski + Show 1 more

Open Access

https://doi.org/10.1590/1519-6984.04815

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Abstract

Aquatic macroinvertebrate fauna is a relevant component of limnic continental aquatic ecosystems, playing an important role in several processes with relevant biocomplexity. The present study characterized the benthic macroinvertebrate fauna found in three hydric bodies in the Sinos river drainage basin regarding community structure. Sample was collected from January to December 2013 in three locations in the basin: the city of Caraá (29 °45'45.5"S/50°19'37.3"W), the city of Rolante (29°38'34.4"S/50°32'33.2"W) and the city of Igrejinha (29°36'10.84"S/50°48'49.3"W). Abiotic components (pH, dissolved oxygen and temperature) were registered and collected samples were identified up to family type. Average annual pH, dissolved oxygen and temperature were similar in all locations. A total of 26,170 samples were collected. Class Insecta (Arthropods) represented 85.5% of total sample. Platyhelmintes, Mollusca and Annelida samples were also registered. A total of 57 families were identified for the drainage basin and estimators (Chao-1, Chao-2 and jackknife 2) estimated richness varying from 60 to 72 families.

Highlights

IntroductionInvertebrates are of major ecologic importance in freshwater environments; they play a decisive role in organic matter fragmentation and decomposition and are important elements in food chains and food webs
Conservation of biodiversity in general and aquatic biodiversity is fundamental to maintain biosphere processes and to keep the course of the evolution of natural systems, in many tropical regions, studies on biodiversity are still at an intermediate stage and not very advanced in knowledge, especially in regions with internal deltas of large rivers in South America, which are active centers of evolution due to their biodiversity and gene flow interaction (Tundisi and Matsumura-Tundisi, 2003).Invertebrates are of major ecologic importance in freshwater environments; they play a decisive role in organic matter fragmentation and decomposition and are important elements in food chains and food webs
Sampling sites can be traditionally classified as rhithron, they do not present great slopes

Summary

Introduction

Invertebrates are of major ecologic importance in freshwater environments; they play a decisive role in organic matter fragmentation and decomposition and are important elements in food chains and food webs. They are directly involved in energy flow and perform an effective role in biogeochemical cycles. Their abundance and diversity are associated to different factors, such as trophic level of aquatic systems, pollution and contamination levels, habitat availability and disturbance frequency (Ismael et al, 1999).

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