Community structure of aquatic insects (Ephemeroptera, Plecoptera, and Trichoptera) in Cerrado streams of Paraguay, Paraná, and São Francisco river basins

Abstract

We evaluated qualitatively and quantitatively the community structure of aquatic insects (Ephemeroptera, Plecoptera, and Trichoptera) in 19 streams in areas of Cerrado in the Paraguay, Paraná, and São Francisco river basins. The number of genera and taxonomic composition were compared at spatial (at the hydrographic basins level) and conservation levels (more preserved and less preserved areas). The influence of spatial and environmental factors in richness and abundance was also evaluated. The geographical distribution of Grumicha, Coryphorus, and Austrotinodes was expanded. The highest Trichoptera richness was found in the São Francisco river basin (F = 5,602, p = 0,004) and a higher number of Ephemeroptera genera occurred in the relatively less preserved sites (F = 6,835, p = 0,009). The pattern of genera distribution was different among basins (R = 0,0336, p = 0,001), but it was similar among relatively less and more preserved areas (R = -0,039, p = 0,737). These findings can be explained by the low impact level in these streams and also by the taxonomic resolution used in this study. Latitude and instream diversity were the most important factors to explain the variation in genera richness and abundance (p = 0.004 and p = 0.026, respectively). Hence, the regional differences can be attributed to spatial influences, quantity or quality of habitats and the original distribution of taxa within each basin.

Benthic Macroinvertebrate Assemblage in Bulod River, Lanao del Norte, Philippines

“…Low taxa richness observed may also indicate devastating impact of impoundment on the benthic macroinvertebrate and pollution stress in the area due to increased human activities (Arimoro et al, 2007;Andem et al, 2012;Edward & Ugwumba, 2011;Latha & Thanga, 2010). Romero et al (2013) added that areas with some fragmentation and siltation points and pasture surrounding riparian vegetation significantly affect community richness, which was also observed in the area. Family-level Biotic Index (FBI) (Hilsenhoff, 1988) (Tampus et al, 2012).…”

“…Very good water quality in Stations 1 and 3 was manifested with its high richness and abundance of pollution sensitive fauna such as Ephemeroptera, Plecoptera and Trichoptera (EPT). These areas were characterized to have thick riparian vegetation along the river bank which directly influenced the community structure of aquatic insects by inputs of nutrients and allochthonous energy (Romero et al, 2013;Barbosa et al, 2001). The same results were also reported by Miserendeno and Pizzolon (2003).…”

Trophic guilds of EPT (Ephemeroptera, Plecoptera, and Trichoptera) in three basins of the Brazilian Savanna

“…The orders Ephemeroptera, Plecoptera, and Trichoptera were represented by 2,728 specimens, distributed in 44 genera and 17 families (for more information on overall EPT assemblage structure, see Romero et al, 2013). The feeding items registered in the 428 analyzed guts were grouped into seven categories: fine particulate organic matter (FPOM); coarse particulate organic matter and plant material (CPOM); fungi (FUN); diatoms (DIA); algae and cyanobacteria (ALG); aquatic insects (AI), and undetermined items (UND) ( Table 1).…”

Composição De Espécies Da Ictiofauna Do Córrego Severo Alta Floresta-Mt

“…A representatividade desta espécie é um forte indicativo de redução da integridade biológica do ecossistema (ALLAN ; FLECKER, 1993;FERREIRA ;CASATTI, 2006, CASATTI et al, 2009. Estas alterações antrópicas tornam a estrutura física do habitat um fator determinante na organização da comunidade aquática, podendo afetar a riqueza, abundância e composição das espécies (ROMERO et al, 2013;ROSENVALD, 2014).…”