<b>Effects of a native and a non-native macrophyte species of Hydrocharitaceae on Chironomidae and Oligochaeta assemblages structure</b> doi: 10.4025/actascibiolsci.v35i3.10855

Abstract

<p>This study investigated the structure of the Oligochaeta and Chironomidae assemblages associated with monospecific stands of two submerged macrophyte species:<em> Egeria najas </em>and <em>Hydrilla verticillata</em>. Samplings were carried out in Leopoldo Backwater and Paraná river, in August 2008. To assess the structure of Oligochaeta and Chironomidae assemblage in each macrophyte we calculated: species density, richness, diversity, and evenness. A detrended correspondence analysis (DCA) was used to summarize Oligochaeta and Chironomidae assemblages composition. The highest values of species density and richness for the two groups were recorded in <em>H. verticillata</em>. Although there were no significant differences in density, richness and Shannon diversity, the assemblage composition of these groups was significantly different between plant species. These results suggest that despite being a recent colonizer in the upper Paraná river habitats, the non-native species <em>H. verticillata</em> seems to provide favorable conditions for the establishment of native assemblages of Chironomidae and Oligochaeta. Moreover, differences in the species composition of Oligochaeta and Chironomidae arose from peculiar characteristics of each plant, as attached microorganisms and organic matter, so that other factors, rather than plant architecture can also influence the assemblage of these groups.</p> <p class="akeyword"> </p><br /

Oligochaeta (Annelida: Clitellata) in the Juruena River, MT, Brazil: species indicators of substrate types

“…Rondônia: Cuniã Lake (Gomes et al 2017). Paraná: Iguaçu River (Behrend et al 2012); in different habitats of the Paraná River floodplain , in several Paraná state reservoirs (Moretto et al 2013) and associated with the macrophytes Hydrilla verticillata and Egeria najas collected in the Paraná River and Leopoldo Backwater (Behrend et al 2013). Rio Grande do Sul: in areas of irrigated rice fields (Sternert et al 2012).…”

“…Distribution: São Paulo: in streams (City of São Paulo) and Rio Claro by Marcus (1943), associated with gastropods (Gorni & Alves, 2006), associated with submerged macrophytes ; associated with the sponge Metania spinata (Gorni, Alves, 2008a) and in urban impacted streams (Sanches et al 2016). Paraná: associated with the macrophytes Hydrilla verticillata and Egeria najas collected in the Paraná River and the Leopoldo Backwater (Behrend et al 2013), in the Iguaçu River (Behrend et al 2012) and the Paraná River in the Ilha Grande National Park, between the states of Mato Grosso do Sul and Paraná (Ragonha et al 2013); in different floodplain habitats of the Paraná River ; in tributaries of the Paraná River ; in Baía River in artificial substrates (Fujita et al 2015) and Ivinhema and Baía rivers (Behrend et al, 2009). Minas Gerais: associated with decomposing leaves of Eichhornia azurea in Manacás Lake (Martins et al 2011).…”

“…Minas Gerais: detected in first order streams of preserved areas (Rodrigues et al 2013) and in an urban stream (Frizzera & Alves 2012). Paraná: Paraná River, in the Ilha Grande National Park, between the states of Mato Grosso do Sul and Paraná (Ragonha et al 2013), in the Iguaçu River (Behrend et al 2012); in different floodplain habitats of the Paraná River ; associated with the macrophytes Hydrilla verticillata and Egeria najas collected in the Paraná River and Leopoldo Backwater (Behrend et al 2013); in tributaries of the Paraná River ; Baía River, in artificial substrates (Fujita et al 2015) and Ivinhema and Baía rivers (Behrend et al 2009). Alagoas: was found by Marcus (1944) in the Paulo Afonso waterfall.…”

Oligochaeta (Annelida: Clitellata) associated to aquatic macrophytes in Brazil

“…Thus, this structural complexity form slits that serve as hiding places and nests, reducing river low (GREGG; ROSE, 1982) and protecting against predators (FERREIRO et al, 2011). Additionally, the Oligochaeta also occurred on exotic macrophytes, Hydrilla verticillata, which according to Behrend et al (2013) provide these organisms with favorable conditions. Eichhornia azurea, which had the highest richness of associated Oligochaeta species, is commonly found in studies associating macroinvertebrates to aquatic macrophytes (FULAN;HENRY, 2006;COPATTI et al, 2013;SILVA;HENRY, 2013).…”

“…In continental aquatic environments, Christoffersen (2007) catalogued 171 Oligochaeta species in South America, out of which 86 occur in Brazil. Moreover, Oligochaeta can be found in many kinds of substrates, such as sandy, clayey (DORNFELD et al, 2006;ALVES et al, 2008;PETSCH et al, 2013;2015), or enriched organic matter (BEHREND et al, 2012). Oligochaeta are also associated to other organisms, such as bryophytes , sponges , molluscs (GORNI; ALVES, 2006), amphibians (ODA et al, 2015) and aquatic macrophytes (CORREIA; TRIVINHO-STRIXINO, 1998;TRIVINHO-STRIXINO et al, 2000;.…”