Aquatic Invertebrates Associated with the Water-Hyacinth (Eichhornia crassipes) in an Eutrophic Reservoir in Tropical Brazil |
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| Authors: | Paulo Marco Marco A. Reis Araújo Magda K. Barcelos Mairy Barbosa Loureiro Santos |
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| Affiliation: | 1. Departamento de Ciências Biológicas , Universidade Estadual de Feira de Santana , Feira de Santana , BA , Brazil popscardoso@yahoo.com.br;3. Departamento de Zoologia e Botanica , Universidade Estadual Paulista “Júlio de Mesquita Filho” , S?o José do Rio Preto , SP , Brazil |
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| Abstract: | Quantitative samples of the aquatic invertebrate fauna associated to water-hyacinth (Eichhornia crassipes) vegetation were taken in an eutrophicated reservoir in southeastern Brazil. The assemblage was dominated by detritivores, most frequently oligochaetes, probably due to the large amount of sediment and detritus retained in the roots. Multivariate analysis (PCA and Canonical Correlation) suggested that, while some environmental variables were important to the dynamics of the system, biological interactions with the prosobranchiad snail Melanoides tuberculata could explain abundance patterns between sample sites. |
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| Keywords: | habitat selection visual signals chemical signals optimal foraging theory crab spiders Brazil |
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