Artículo científico publicado en Biological Limnology.

 

Autores: Marçal, SF y Callil, CT.

Abstract

This work was based on the assumption that the structure of the invertebrates’ community associated with Eichhornia crassipes is influenced by the water’s physicochemical conditions and the abundance of Limnoperna fortuneion the roots of this plant. In the dry season, 0.1875 m2 of E. Crassipes were collected for a study of the associated invertebrates, including the exotic bivalve species L. Fortunei from 15 lakes along the banks of the Paraguay River. A total of 86,943 invertebrates were collected and the predominant taxa found in the roots were Hydrobiidae, Ostracoda, Hydracarina, and Euperasp. The ordination showed that conductivity, transparency and dissolved oxygen were the variables that best represented limnological characteristics of the lake waters, but this set of physicochemical parameters did not present a relation with the structure of the invertebrate community summarized by means of a PCoA. However, Trichoptera, Odonata and Conchostraca showed a negative correlation to dissolved oxygen and depth, probably because these factors directly influenced the state of decay of the E. crassipes and consequently the density of these invertebrates. The absence of significant relation between the invertebrates’ community and L. fortuneiabundance can be associated with low densities, meaning that the environment is resilient to the aggressive growth of this population in the Pantanal.

 

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