Functional groups of entomofauna associated to aquatic macrophytes in Correntoso river, Rio Negro sub-region, Pantanal, Mato Grosso do Sul State, Brazil - doi: 10.4025/actascibiolsci.v34i1.7822

This work aimed to study the structure of functional groups of entomofauna associated to aquatic macrophytes in Correntoso river, Rio Negro sub-region, Pantanal, Mato Grosso do Sul State, Brazil. Six samples were taken in different seasonal periods; ebb, dry and wet. The organisms were collected using D net (300 m mesh), sweeping five times through the roots of macrophyte banks at each sample session. Three environments were compared (open, intermediary, close) using data from six collection sites, through which were analyzed absolute abundance, observed richness of families and the sampled specimens were also separated in functional groups. A total of 60 families from 12 orders of Insecta were registered, totaling 19,773 sampled insects. The largest number of families was categorized into predators functional group, with 34 families collected, followed by the collectors with 17, shredders-herbivores ten and scrapers eight.

Distribution of entomofauna associated with aquatic macrophytes in the reflux of the Correntoso river, Pantanal do Negro, Mato Grosso do Sul State, Brazil - DOI: 10.4025/actascibiolsci.v31i2.1182 / Distribuição da entomofauna associada às macrófitas aquáticas na vazante do rio Correntoso, Pantanal do Negro, Estado do Mato Grosso do Sul, Brasil - DOI: 10.4025/actascibiolsci.v31i2.1182

This work aimed ato research the distribution of insects associated with aquatic macrophytes and the similarity among collection sites during the reflux period in a stretch of Correntoso river, Pantanal do Negro, Mato Grosso do Sul State, Brazil. The collection sites were determined by changes in the riparian formation structure, characterized as open when there is communication with flooded fields and intermediary and closed when there is not any communication with flooded fields. Three collections were taken at six sample sites, during reflux periods. The organisms were collected using a D net, 300 µm mesh, with samples from five nets thrown in roots of aquatic macrophytes. Family richness, absolute and relative abundance of the insects found, and similarity of collection sites were analyzed using Euclidian distance and complete connection, Shannon-Wiener diversity index, with log2. Sixty-four families from 10 orders of Hexapoda class were registered, totaling 2,525 individuals 2,405 of them aquatic and semi- aquatic, and 120 terrestrial. The collect sites did not present a fixed model of similarity, and the formation of groups occurred in distinct forms at each collection.

Este trabalho teve como objetivo pesquisar a distribuição de insetos associados a macrófitas aquáticas e a similaridade dos sítios de coleta, no período de vazante, em um trecho do rio Correntoso, Pantanal do Negro, Estado do Mato Grosso do Sul, Brasil. Os sítios de coleta foram determinados conforme a mudança na estrutura da formação ripária, caracterizados como abertos com comunicação com campos inundáveis; intermediários sem comunicação com campos inundáveis; fechados sem comunicação com campos inundáveis. Foram realizadas três coletas durante o período de vazante, em seis sítios de coletas. Os organismos foram coletados utilizando rede D com malha de 300 µm e esforço amostral de cinco lances de rede em raízes de macrófitas aquáticas. Foi analisada a riqueza de famílias, a abundância absoluta e relativa dos insetos encontrados, a similaridade dos sítios de coleta por análise de agrupamento, utilizando distância euclidiana e ligação completa, índice de diversidade de Shannon-Wienner, com log2. Foram registradas 64 famílias de dez ordens da Classe Hexapoda, totalizando 2.525 indivíduos, 2.405 aquáticos e semi-aquáticos e 120 terrestres. Os sítios de coleta não apresentaram padrão fixo de similaridade, e a formação dos grupos ocorreu de forma distinta a cada coleta.