Baetidae (Insecta, Ephemeroptera) em córregos do cerrado matogrossense sob diferentes níveis de preservação ambiental

Abstract

ABSTRACT. Baetidae (Insecta, Ephemeroptera) of Cerrado streams in the state of Mato Grosso, Brazil, under different levels of environmental preservation. The effect of different stream environmental preservation levels, in 1 st to 4 th orders, over the richness, abundance, similarity in the composition and the potential of Baetidae (Ephemeroptera) species as bioindicators were investigated in a Cerrado region located in the state of Mato Grosso, Brazil. A total of twenty species/morphospecies were catalogued from the 1752 samples of nymphs, resulting in a new record for two species in Brazil. Values of Habitat Integrity Index (HII) were categorized among damaged, modified, and preserved environments. Species richness was different between sites, being greater in disturbed habitats. Total abundance was higher among preserved and altered environments, and differed significantly from the degraded areas. The NMDS analysis indicates that, in preserved and modified sites, the similarity in the composition of species differs from degraded areas. Four species showed a positive relationship with increasing values of HII. Baetidae showed environmental indicator species with different levels of preservation, with Zelusia principalis

The effects of environmental integrity on the diversity of mayflies, Leptophlebiidae (Ephemeroptera), in tropical streams of the Brazilian Cerrado

“…The final index varies from zero to one, with the highest scores referring to the most intact environments. The index has been used in a number of studies of environmental impact, and has produced good results for the analysis of the communities of a number of taxonomic groups of aquatic insects across different regions (e.g., Dias-Silva et al, 2010;Silva et al, 2010;Souza et al, 2011;Pereira et al, 2012;Silva-Pinto et al, 2012;Brasil et al, 2013;Carvalho et al, 2013).…”

“…In general, the loss of environmental quality tends to make habitats more homogeneous, which may have consequences such as the loss of species richness, the modification of species composition, and shifts in abundance patterns (Castello, 2008;Axelsson et al, 2011;Dolny´et al, 2012;Carvalho et al, 2013;Ligeiro et al, 2013;Suga and Tanaka, 2013;Wahl et al, 2013). Ultimately, this process may alter the distribution of the more sensitive species (Souza et al, 2011;Monteiro Ju´nior et al, 2013).…”

Trichoptera as bioindicators of habitat integrity in the Pindaíba river basin, Mato Grosso (Central Brazil)

“…This index is based on the measurement of several visually assessed parameters related to land use, riparian zone conservation, streambed characteristics, and characteristics of stream channel morphology related to margin and streamlet bed structure. Then, the index is directly related to the degree of environmental conservation and has been successfully used in other studies to evaluate the integrity in aquatic systems (Dias-Silva et al, 2010;Shimano et al, 2010;Juen and De Marco, 2011;Nogueira et al, 2011;Souza et al, 2011).…”

Fish species indicators of environmental variables of Neotropical streams in southern Brazil, upper Paraná River basin

“…The IndVal has been employed in studies with different organisms, from bacteria (Shawkey et al 2009), plants (Bataineh et al 2007), aquatic invertebrates (Carbonell et al 2011, Souza et al 2011, amphibians (Campos et al 2013), birds (Mikusiński et al 2001), and fi sh (Penczak 2009, Penczak et al 2012, Dukowska et al 2013. Karr (1981) considers some advantages of using fi sh as indicator organisms in environmental monitoring programs: the large amount of information on the life history of many species of fi sh, the range of trophic levels, the relative easiness of identifi cation, the relative knowledge of the general public to understand the results from scientifi c information about this group, the possibility of analysing the effects of toxicity and stress along fi sh growth and reproduction, and the presence of fi shes in virtually all types of aquatic environments.…”