Assemblage of immature Odonata (Insecta, Anisoptera) in streams of the Mato Grosso do Sul State: spatial implications

Abstract

ABSTRACT. This study investigated the assemblages attributes (composition, abundance, richness, diversity and evenness) and the most representative genera of Odonata, Anisoptera at Água Boa and Perobão Streams, Iguatemi River basin, Brazil. Both are first order streams with similar length that are impacted by riparian forest removal and silting. Quarterly samplings were conducted from March to December 2008 in the upper, intermediate and lower stretch of each stream. The Mantel test was used to check the influence of spatial autocorrelation on the Odonata composition. Spatial variations in the composition were summarized by the Principal Coordinates Analysis (PCoA) using Mantel test residuals. The effects of spatial correlation on richness and abundance were investigated by the spatial correlogram of Moranʼs I coefficients. The most representative genera in each stream were identified by the Indicator Value Method. The spatial variations in the attributes of the assemblages were assessed using analysis of variance of null models. We collected 500 immature individuals of 23 genera and three families. Among the attributes analyzed only the composition and abundance showed significant spatial differences, with the highest mean abundance found in the Perobão Stream. Miathyria and Zenithoptera were the indicator genera of the Água Boa Stream and Erythrodiplax, Libellula, Macrothemis, Progomphus and Tramea were the indicator genera of the Perobão Stream. KEYWORDS.Aquatic invertebrates, Iguatemi River basin, lotic environments, odonatofauna.RESUMO. Assembleia de imaturos de Odonata (Insecta, Anisoptera) em riachos sul-matogrossenses: implicações espaciais. Este trabalho investigou atributos de assembleias (composição, abundância, riqueza, diversidade e equitabilidade) e os gêneros mais representativos de Odonata, Anisoptera nos riachos Água Boa e Perobão, bacia do rio Iguatemi, MS, Brasil. Os riachos são de primeira ordem, apresentam extensão similar e são impactados pela remoção da mata ripária e assoreamento. As amostragens foram realizadas trimestralmente de março a dezembro/2008 nos trechos superior, intermediário e inferior de ambos os riachos. O teste de Mantel foi utilizado para verificar a influência da autocorrelação espacial sobre a composição de Odonata. Variações espaciais na composição foram sumarizadas através da Análise de Coordenadas Principais (PCoA) utilizando-se os resíduos do teste de Mantel. Os efeitos da correlação espacial na riqueza e abundância foram investigados através do correlograma espacial dos coeficientes do I de Moran. Para identificar os gêneros mais representativos em cada riacho foi utilizado o Método do Valor Indicador. As variações espaciais dos atributos das assembleias foram avaliadas por meio de análises de variância de modelos nulos. Foram coletados 500 indivíduos imaturos distribuídos em 23 gêneros e três famílias. Dentre os atributos analisados, apenas a composição e abundância apresentaram diferenças espaciais significativas, sendo o maior valor médio do último atributo regi...

Metacommunity patterns of Amazonian Odonata: the role of environmental gradients and major rivers

“…Indeed, Zygoptera presents generally high turnover of species at large spatial extents (Bried et al, 2016; Brasil et al, 2018; Bried & Siepielski, 2018), following a Clementsian pattern (i.e., the response to environmental gradients produces discrete communities that replace each other; Leibold & Mikkelson, 2002) at least in in Amazonian non-impacted streams (Brasil et al, 2017). In contrast, the broader ecological amplitude (Remsburg & Turner, 2009; Mendes, Cabette & Juen, 2015; Soares et al, 2015) and higher dispersal ability of Anisoptera (Angelibert & Giani, 2003; McCauley, 2006; May, 2013) will result in a random metacommunity distribution across interfluves. If this expectation holds true, many Zygoptera species would have their distribution range limited by major rivers, while most Anisoptera will not present such limitation.…”

Environmental drivers and composition of assemblages of immature odonates (Insecta) in a subtropical island in southern Brazil

“…Furthermore, the knowledge on their ecological relationships with environmental drivers is even scarcer. The few ecological studies available conducted in tropical Brazilian streams show that substrate type (organic vs. inorganic) and water quality are important drivers of odonate composition (Carvalho & Nessimian, 1998;Delgado, 2002;Assis et al, 2004;Soares et al, 2015).…”

<b>Immature Odonata-Anisoptera in the Iguatemi river basin, upper Paraná River, Mato Grosso do Sul State, Brazil

“…For the Mato Grosso do Sul, the knowledge about the richness of Odonata is concentrated mainly in the Pantanal region (Longfield, 1929, Santos, 1944, Souza, Costa, & Santos, 1999, Souza, Costa, & Espindola, 2002, Souza & Costa 2006, Heckman, 2006, Pessacq & Costa 2007, Heckman, 2008, Dalzochio, Costa, & Uchôa, 2011a, Dalzochio, Souza, Uchôa, & Costa, 2011b. Specifically, for the Iguatemi River basin, a study with this approach was performed only at streams of the lower stretch of this basin (see Soares et al, 2015).…”