Distribution of aquatic macroinvertebrate assemblages in a subtropical coastal lake: Response to environmental parameters
Lemes da Silva, Aurea Luiza; da Rosa Pires, Jéssica; Pagliosa, Paulo R.; Petrucio, Mauricio M.
published: Jul 1, 2016
published online: Jun 13, 2016
manuscript accepted: Apr 13, 2016
manuscript received: Apr 12, 2015
ArtNo. ESP141018802003, Price: 29.00 €
Abstract Understanding the distribution of aquatic invertebrates and its relationship with environmental parameters has been challenging in subtropical freshwater coastal ecosystems. In this study, we investigate the environmental drivers of the distribution of aquatic invertebrates across different spatial and temporal scales in a freshwater lagoon. We sampled five sampling sites with an Ekman-Birge grab during 12 months and analyzed sediments and the invertebrate community. The results showed that the composition of sediment particles and organic matter varied significantly among the sampling sites. In contrast, water chemistry variables showed only seasonal differences. Significant differences in taxonomic richness and total density were observed among sampling sites and seasons. Principal component and the BIO-ENV routine analyses showed that local-scale factors (e.g. grain size) were the most important spatial determinants for the ordination of aquatic macroinvertebrates. Invertebrate assemblages responded to spatial and temporal variability with changes in their abundance and taxonomic richness. Our results suggest that community changes may be related to seasonality, which is marked by well-defined summers and winters, as well as for the grain-particle size composition and organic matter percentage in the sediment.