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Using oligochaeta assemblages as an indicator of environmental changes.

R D L Behrend¹, A M Takeda, L C Gomes

¹Curso de Pós-graduação em Ecologia de Ambientes Aquáticos Continentais, Departamento de Biologia, Universidade Estadual de Maringá - UEM, Colombo, 5790, CEP 87020-900, Maringá, PR, Brazil. romulobehrend@yahoo.com.br

Brazilian Journal of Biology = Revista Brasleira De Biologia

|January 9, 2013

Summary

Reservoir cascades reduced Oligochaeta species richness and altered their community composition in the Iguaçu River. Environmental factors and human activities significantly impacted these aquatic worms, highlighting their use as bioindicators.

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Area of Science:

Aquatic Ecology
Environmental Science
Zoology

Background:

The Iguaçu River's ecosystem is impacted by a cascade of reservoirs.
Oligochaeta (aquatic worms) are sensitive to environmental changes.

Purpose of the Study:

To test if reservoir cascades reduce species richness and alter Oligochaeta assemblage composition.
To identify environmental variables and anthropogenic factors influencing Oligochaeta.

Main Methods:

A field survey was conducted along the entire Iguaçu River, comparing dammed and undammed sections.
Canonical Correspondence Analysis (CCA) was used to analyze environmental variables and Oligochaeta data.

Main Results:

Species richness of Oligochaeta significantly decreased along the river.
Oligochaeta composition varied spatially, with distinct patterns in dammed (Third Plateau) and undammed sections.
Altitude, conductivity, substrate type, temperature, human occupation, and damming influenced Oligochaeta assemblage.

Conclusions:

Reservoir cascades negatively affect Oligochaeta species richness and community structure.
Oligochaeta serve as effective surrogate taxa for monitoring environmental changes in impacted rivers.
A significant environmental gradient exists along the Iguaçu River, from headwaters to mouth.