-96201-900 -Rio Grande -RSBrasil. 2 docbruno@furg.br RESUMO As espécies de peixes que ocorrem no estuário da Lagoa dos Patos (ELP) apresentam diferentes estratégias de desova que procuram otimizar um balanço entre condições ambientais locais e remotas, e seu ciclo de vida. O presente trabalho descreve e analisa a distribuição espacial, variabilidade temporal e a influência de variáveis ambientais sobre a abundância de ovos e larvas de Micropogonias furnieri no ELP. Foram utilizadas variáveis ambientais e um banco de dados de ictioplâncton com registros históricos. O ictioplâncton foi coletado com rede de plâncton com malha de 300 ou 500 µm em amostras mensais e/ou quinzenais. Análise de variância foi utilizada para testar os efeitos da variação temporal e distribuição espacial sobre a abundância média de ovos e larvas. Salinidade, temperatura, pressão atmosférica e velocidade dos ventos foram importantes na variabilidade sazonal da abundância, enquanto a precipitação e vazão foram importantes para as diferenças interanuais. A abundância de ovos e larvas foi maior no estuário inferior e durante a primavera e verão. Estes resultados sugerem que a variabilidade na distribuição dos primeiros estágios de vida de M. furnieri é determinada por diferentes escalas temporais. ABSTRACTFish species from the Patos Lagoon Estuary (PLE) adopt different spawning strategies to optimize the balance between remote and local environmental conditions during their life cycle. The purpose of this study was to describe and analyze the spatial distribution, temporal variability and the influence of environmental variables on the abundance of eggs and larvae of Micropogonias furnieri in the PLE. Environmental variables and ichthyoplankton historical records were used in the analysis. Ichthyoplankton was collected with a 300 or 500 µm-plankton net in monthly and/or fortnightly samples. Analysis of variance was used to test the effects of spatial distribution and temporal variation on the average abundance of eggs and larvae. Temperature, salinity, atmospheric pressure and winds were important for the seasonal variability of abundance, while precipitation and water discharge were important for interannual differences. The abundance of eggs and larvae in the estuary was higher in the lower estuary during spring and summer. These results suggest that the variability in the distribution of early life stages of M. furnieri is determined at different time scales.
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