Sucess o de invertebrados durante o processo de decomposi o de duas plantas aqu芍ticas (Eichhornia azurea e Polygonum ferrugineum) = Succession of invertebrates during the decomposition process of two aquatic plants (Eichhornia azurea and Polygonum ferrugineum)

作者：Roger Paulo Mormul; Luiz Alberto Vieira; Sidnei Pressinatte Junior; Alexandre Monkolski

来源：Acta Scientiarum - Biological Sciences, 2006.

• decomposi o
• macrofitas aquaticas
• coloniza o de macroinvertebrados
• ambientes lenticos
• decomposition
• aquatic macrophytes
• macroinvertebrates colonization
• lentic environments

A coloniza o de invertebrados durante o per赤odo de 56 dias de decomposi o de duas esp谷cies de plantas aqu芍ticas (Eichhornia azurea e Polygonum ferrugineum) foi investigada para determinar o papel de macroinvertebrados no processo de fragmenta o da folha. Durante aan芍lise do material, foi constatado um total de 2096 invertebrados, associados a E.azurea e 6154 invertebrados associados a P. ferrugineum, identificados dentro de 18 t芍xons, com predominanciade larvas de Diptera da fam赤lia Chironomidae, seguido por esp谷cimes de Oligochaeta, microcrust芍ceos como Cladocera e Copepoda. Em ambas as plantas, os macroinvertebrados mostraram um aumento significativo de densidade ao longo do processo de decomposi o, o que provavelmente est芍 associado 角 perda de compostos fen車licos. Os resultados sugerem que as esp谷cies de macr車fitas apresentam associa es espec赤ficas com seus consumidores, ou seja, o processo de sucess o da coloniza o torna-se diferenciado de acordo com as caracter赤sticas fenol車gicas da planta. The invertebrate colonization was investigated during 56-day decomposition of two macrophytes species (Eichhornia azurea andPolygonum ferrugineum). The aim was to determine the role of macroinvertebrates in the process of leaf fragmentation. During material analysis, 2096 invertebrates were associated with E.azureaand 6154 were associated with P. ferrugineum, identified in 18 taxons, with predominance of Diptera larvae (Chironomidae family specially), followed by Oligochaeta species and microcrustaceans such as Cladocera and Copepoda. In both macrophytes the macroinvertebratesshowed a significant increase of density through the process of decomposition, which is probably associated with the loss of phenolic compounds. Results suggest that macrophytes specimens show specific associations with their consumers, i.e., the succession process of colonization becomes singular according to the phenolic characteristics of the plant.