Distribuição espacial e variação temporal da composição de espécies de borrachudos (Diptera: Simuliidae) em uma microbacia situada no norte do Paraná

Abstract

-In this work, the survey of simuliid species and the study of their spatial distribution in four streams of a small watershed situated in Londrina, Paraná State, were carried out from January to October 2007. Changes in the species composition of the breeding sites were also checked along the sampling months. Seventeen black fl y species were found, being Simulium botulibranchium Lutz, Simulium travassosi d'Andretta & d'Andretta, Simulium anamariae Vulcano, Simulium brachycladum Lutz & Pinto and Simulium metallicum s.l. Bellardi new records for Paraná State. The Canonical Correspondence Analysis showed that the environmental variables most correlated to the species distribution among sample sites were water conductivity and those linked to physical dimensions of the breeding sites, like width, depth and water velocity. The matrix of faunistic similarity among collecting dates was negatively correlated to the time interval of sampling matrix for three of the water bodies studied, showing the existence of temporal changes in the species composition. According to Multiple Regression Analysis, temporal abundance variation of Simulium perfl avum Roubaud, Simulium inaequale Paterson & Shannon and Simulium lutzianum s.l. Pinto was not linked to air temperature, photoperiod and rainfall, suggesting the infl uence of other factors, probably those directly associated to specifi c breeding site conditions. The results indicate that differences in physical and chemical characteristics among water bodies may affect the taxonomic composition of simuliids in this watershed.

Spatio-temporal distribution of preimaginal black flies (Diptera: Simuliidae) in streams of a sub-basin of the Uruguay river basin, southern Brazil

“…The fact that only few species were expressive in abundance is in accordance with the results obtained by mCgill et al (2007) and several other studies regarding immature stages of simuliids (strieder et al 2006;sAntos et al 2010;ArAndA 2017;menzel et al 2019;jitklAng et al 2020), suggesting that environments modified by economic activities are more homogeneous (CouCeiro et al 2014). In the Comandaí river sub-basin, a higher abundance of simuliids (44.38%) was observed in mouth stretches.…”

“…The average richness found in studies conducted in South Brazil are high in relation to the other regions of Brazil lAndeiro et al 2009). Species diversity has practically not changed between seasons, which corroborates other studies on the temporal distribution of Simuliidae, where no major changes in species diversity were found (grillet & BArrerA 1997;sAntos et al 2010). Such findings suggest that changes in species composition are more related to local geomorphology and environmental factors, in addition to the degree of the environment's conservation status (strieder et al 2006).…”

Diversity and microdistribution of black fly (Diptera: Simuliidae) assemblages in the tropical savanna streams of the Brazilian cerrado

“…Black fly larvae were sampled from the Tocantins River and three tributaries, located in the Brazilian savanna (state of Tocantins, Brazil) Key words: Neotropical Region -microhabitat associations -diversity -species richness -water current range Hamada et al (2002) pointed out the relative scarcity of ecological studies on the black fly fauna of the Neotropical Region. In addition to this limited number of studies, most of the literature on this subject is restricted to a few geographical areas; in the specific case of Brazil, a large number of biomes lack ecological studies on their black fly fauna (Figueiró & Gil-Azevedo 2010), as most of the studies concentrate on the central Amazon (e.g., Hamada et al 2002), southeastern (e.g., Araújo-Coutinho et al 2004, Figueiró et al 2006, Pepinelli et al 2005) and southern (Strieder 2004, Santos et al 2010 Mata Atlântica biomes. Another issue raised in Hamada et al (2002) is that most of the studies on Neotropical black flies approach the ecology of the individual species population (e.g., Hamada & McCreadie 1999), rather than the whole black fly community.…”

Seasonal variation in black fly (Diptera: Simuliidae) taxocenoses from the Brazilian Savannah (Tocantins, Brazil)

“…Only a few studies have investigated the distribution and population dynamics of Neotropical black flies larvae (Figueiró et al , , Coppo and Lopes , Santos et al ), and most of those studies were concentrated in just a few biomes such as Amazonia and Mata Atlântica (Figueiró and Gil‐Azevedo ). Biotic factors may strongly affect community structure in lotic systems, whereas abiotic factors are believed to play a dominant role in shaping species assemblages (Allan ).…”