%0 Journal Article
%T Distribui  o espacial e temporal das larvas de Chironomidae em diferentes ambientes do complexo - rio Ba¨ªa, Estado do Mato Grosso do Sul, Brasil = Temporal and spatial distribution of Chironomidae larvae in different environments of the Ba¨ªa river complex, Mato Grosso do Sul State, Brazil
%A Adriana F¨¦lix dos Anjos
%A Alice Michiyo Takeda
%A Gisele Daiane Pinha
%J Acta Scientiarum : Biological Sciences
%D 2011
%I Eduem - Editora da Universidade Estadual de Maring¨¢
%X A plan¨ªcie de inunda  o do alto rio Paran¨¢ caracteriza-se pela grandediversidade de organismos aqu¨¢ticos e as larvas de Chironomidae destacam-se por sua elevada abundancia. A partir da hip¨®tese de que as vari¨¢veis abi¨®ticas influenciam a composi  o, densidade e dominancia das larvas de Chironomidae em diferentes ambientes eper¨ªodos amostrados, este trabalho objetivou: caracterizar o rio Ba¨ªa, canal secund¨¢rio, lagoa n o-conectada (Fechada) e lagoa conectada (Guaran¨¢) da plan¨ªcie de inunda  o do alto rio Paran¨¢, de acordo com os atributos da assembl¨¦ia de Chironomidae e identificar poss¨ªveis gradientes de distribui  o espacial e temporal das larvas, relacionando-as com algumas vari¨¢veis abi¨®ticas. As coletas foram realizadas no per¨ªodo de mar o de 2003 a dezembro de 2005, em tr¨ºs pontos distintos (margens e centro), com o aux¨ªlio de um pegador tipoPetersen modificado. A An¨¢lise de Correspond¨ºncia Can nica mostrou que as larvas foram influenciadas principalmente pela textura granulom¨¦trica do sedimento. O canal Curutuba, pela presen a de seixos, diferenciou-se das demais esta  es de coleta como rio Ba¨ªa e as lagoas de inunda  o onde predominaram as part¨ªculas mais finas. Pode-se concluir que a composi  o granulom¨¦trica, a porcentagem de mat¨¦ria organica presente no sedimento e a hidrodinamica de cada ambiente foram os principais fatores que influenciaram a distribui  o espacial das larvas de Chironomidae. The floodplain of the upper Paran¨¢ river is characterized by the great diversity of aquatic organisms, and the larvae of Chironomidae are distinguished for their high density. Starting from the hypothesis that abiotic variables influence Chironomidae larvae composition, density and dominance in different environments and sampled periods, this study aimed to characterize the Ba¨ªa river, secondary channel, floodplain lakes (connected and non-connected) of the Paran¨¢ river floodplain, according to attributes of Chironomidae assemblage, and identify possible gradients of temporal and spatial distribution of the larvae, relating them with abiotic variables. The collections were carried out from March 2003 to December 2005. Samples were collected in three points (margins and center), using a modified Petersen grab. CCA showed the larvae were influenced mainly by sediment particle size. Curutuba channel, due to the presence of pebbles, differed from other sites such as the Ba¨ªa river and floodplain lakes, where fine particles predominated. It was concluded that particle size composition, percentage of organic matter andhydrodynamic of each environment were the
%K insetos aqu¨¢ticos
%K dominancia
%K composi  o granulom¨¦trica
%K plan¨ªcie de inunda  o
%K rio Paran¨¢
%K aquatic insects
%K dominance
%K granulometric composition
%K floodplain
%K Paran¨¢ river
%U http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/5386/5386