Distribuição espacial e variações temporais da abundância de ovos e larvas de Micropogonias furnieri no estuário da Lagoa dos Patos: registros históricos e forçantes ambientais

Abstract

-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.

Spatial And Temporal Distribution Patterns Of Larval Sciaenids In The Estuarine System And Adjacent Continental Shelf Off Santos, Southeastern Brazil

“…Previous studies on the early life history of the sciaenids off Southern and Southeastern Brazil include those by Matsuura and Nakatani (1979) who described the development of larval Umbrina coroides Cuvier, 1830 near Anchieta island; Sinque (1980) who studied the larval and juvenile development of Cynoscion leiarchus (Cuvier, 1830), Menticirrhus americanus, Micropogonias furnieri, Stellifer rastrifer, Macrodon ancylodon (Bloch & Schneider, 1801) and Isopisthus parvipinnis (Cuvier, 1830) in the Cananéia-Iguape estuary; Katsuragawa et al (1993) who described the larval distribution of Menticirrhus americanus at Ubatuba; Godefroid et al (2001) who described the larval and juvenile occurrence of Menticirrhus americanus, Menticirrhus littoralis (Holbrook, 1847), Umbrina coroides and Micropogonias furnieri in the Pontal do Sul region; Bruno and Muelbert (2002;2009) who investigated the distribution and abundance patterns of eggs and larvae of Micropogonias furnieri in the Patos lagoon, and Itagaki et al (2007) who described the larval and juvenile development of Bairdiella ronchus (Cuvier, 1830) in the Cananéia-Iguape estuary. However, no studies on early sciaenids have been undertaken in the estuarine and coastal area around Santos.…”

Long-term variation in the ichthyofauna of Flamengo Cove, Ubatuba, São Paulo

“…In terms of the number of individuals, we noticed that nearly 71% of the total number of individuals was sampled in spring, although the biomasses of both seasons are nearly 50% of the total weight. This shows that there are more individuals relatively smaller in spring than in autumn, which may indicate a possible reproductive season for at least some of the species (e.g., Araújo & Santos, 1999;Bernardes & Dias, 2000;Robert & Chaves, 2001;Castello & Castello, 2003;Godefroid et al, 2004;Lima & Castello, 2007;Bruno & Muelbert, 2009). As for the biomass, approximately 71% of the total weight was sampled in 1990 although the number of individuals did not differ much between the two years.…”

Incorporating early life stages of fishes into estuarine spatial conservation planning

“…Despite the strong seasonal pattern in recruitment of fish eggs and larvae to the Patos Lagoon estuary, long‐term studies suggest the existence of decadal variations in climate due to El Niño Southern Oscillation (Muelbert et al ., ). El Niño (high precipitation) and La Niña (low precipitation) events interact with wind patterns in the region and influence the salinity in this ecosystem and consequently control the occurrence and abundance of fish eggs and larvae (Bruno and Muelbert, ). Despite these disturbances, the study period showed consistent patterns in salinity and consequently in the recruitment of such early life stages of fishes into the Patos Lagoon estuary (Muelbert et al ., ).…”