Influência da disponibilidade de margem sobre a densidade e a riqueza de larvas de Chironomidae em lagoas de inundação neotropical
Palavras-chave:
Biodiversidade, Invertebrados, Região litoral, Região marginal, Alto Rio Paraná, ZoobentosResumo
Os índices de disponibilidade de margem em lagoas foram criados para a região temperada. No entanto, lagoas de ambientes temperados e neotropicais possuem diferentes formações geológicas. Por exemplo, a diferença entre a zona litorânea e a limnética não é tão acentuada em lagoas da região neotropical, devido às suas baixas profundidades. Neste estudo são propostas adaptações do índice de Hutchinson para lagoas tropicais. Aplicou-se este novo índice em 27 lagoas da planície aluvial do Alto Rio Paraná. O novo índice de disponibilidade de margens foi positivamente relacionado com a densidade e riqueza de Chironomidae. Estes resultados sugerem que quanto maior a disponibilidade de margens, maiores serão a densidade e a riqueza de larvas. A zona litorânea de algumas lagoas é complexa, com macrófitas submersas ou emergentes, além do substrato formado por galhos e folhiços que favorece a formação de diversos habitats nessa região. Portanto, a maior disponibilidade da zona litorânea parece ser o principal fator estruturador da comunidade de Chironomidae. Logo, o índice modificado demonstrou ser uma importante ferramenta estatística para indicar lagoas onde provavelmente encontram-se maiores valores de riqueza de Chironomidae, devido a maior disponibilidade em regiões litorâneas.
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