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A teoria do Paradoxo do Plâncton postula que ambientes que apresentam flutuacoes temporais periodicas apresentariam alta diversidade de especie, uma vez que essas flutuacoes impediriam a ocorrencia da exclusao competitiva. Este trabalho teve como objetivo avaliar a variacao da comunidade de Odonata adulto na Bacia do Rio Suia-Micu, testando a hipotese de que locais que apresentam variaveis ambientais com maiores amplitudes de variacao possuiriam maiores riquezas de especies. Foram amostrados 11 corpos d´agua, em uma area de transicao Cerrado-Floresta Amazonica na regiao centro-leste do estado de Mato Grosso, Brasil. As variaveis ambientais avaliadas foram integridade ambiental (HII) e amplitude de variacao do pH, condutividade, temperatura do ar, temperatura da agua, oxigenio dissolvido, amonia, fosforo e Mg+. Foram coletados 2.144 especimes, distribuidos em oito familias, 41 generos e 78 especies. Nossa hipotese nao foi corroborada, uma vez que a regressao multipla entre a riqueza estimada de especie de Anisoptera e Zygoptera e a amplitude de variacao dos fatores fisico-quimicos nao foi significativa para nenhuma das variaveis analisadas, assim como para o HII. Nossos resultados sugerem que as variacoes na comunidade de Odonata em corregos nao podem ser explicadas pelo Paradoxo do Plâncton. Acreditamos que este resultado pode ter ocorrido principalmente devido as baixas variacoes nas condicoes ambientais analisadas, acao de outros processos locais, como a competicao e predacao, ou por diferencas ecofisiologicas, resultado da variacao de tamanho corporal e da capacidade de termorregulacao dos adultos na ordem estudada. Variations in Odonata (Insecta) Community in Streams may be Predicted by the Plankton Paradox? Explaining Species Richness by Environmental Variability Abstract. The theory of Plankton Paradox postulates that environments that exhibit regular temporal fluctuations would present a high diversity of species, since such fluctuations would prevent the occurrence of competitive exclusion. This work aimed evaluate variations in adult Odonata community in catchment of River Suia-Micu, testing the hypothesis that sites with environmental variables with the largest amplitude of variation would present the highest species richness. Were sampled 11 water bodies in an area of transition Cerrado-Amazon Forest in east-central Mato Grosso state, Brazil. Environmental variables evaluated were: environmental integrity (HII) and range of variation of pH, conductivity, air temperature, water temperature, dissolved oxygen, ammonia, phosphorus and Mg+. Were collected 2.144 specimens, distributed in eight families, 41 genera and 78 species. Our hypothesis was not confirmed, since the multiple regression analysis performed between the estimated kind of richness Anisoptera and Zygoptera with range of variation of physical-chemical was not significant for any of the eight variables, as well as for HII. Our results suggest that variations in the community of Odonata in streams cannot be explained by Plankton Paradox. We believe that this result may have occurred due mainly to the low variations in environmental conditions discussed, action of other local processes such as competition and predation or differences ecophysiological result of body size variation and capacity of thermoregulation in the order of the adults studied.

entomobrasilis

As variações na comunidade de Odonata (Insecta) em córregos podem ser explicadas pelo Paradoxo do Plâncton? Explicando a riqueza de espécies pela variabilidade ambiental