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首页> 外文期刊>Marine ecology progress series >Seasonal changes in density, biomass, and diversity of estuarine fishes in tidal mangrove creeks of the lower Caete Estuary (northern Brazilian coast, east Amazon)
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Seasonal changes in density, biomass, and diversity of estuarine fishes in tidal mangrove creeks of the lower Caete Estuary (northern Brazilian coast, east Amazon)

机译：下卡蒂河口（巴西北部海岸，东亚马逊河）的潮红树林小河中河口鱼类的密度，生物量和多样性的季节性变化

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摘要

The present study investigated the assemblage of fish species in an intertidal mangrove forest during high tide in a macrotide region. We describe the seasonal changes in the fish assemblage composition in relation to biomass, density, and species number in tidal creeks of the Furo do Meio, Caete Estuary, Brazil. A total of 29 107 individuals of 49 species in 26 families were caught using a block net. Their total weight was 526 kg (total density 0.11 ind. m~(-2) and total biomass 2.1 g m~(-2)). Analysis of the catch data showed that the number of species varied significantly between creeks, and that total fish biomass differed significantly between seasons. The densities and biomass of the 2 most important species, Cathorops pleurops and Colomesus psittacus, were significantly different between seasons. The densities and biomass of C. pleurops, Pterengraulis atherinoides, Pseudauch-nipterus nodosus, and Stellifer naso showed significant temporal differences. Significant differences between creeks were observed in the density and biomass of Anchovia clupeoides and Rhinosardinia amazonica. The abundance―biomass comparison (ABC) plots for the fish fauna in the creeks of the Furo do Meio showed that the dominant species increased in number and weight at the beginning of the rainy season. As a result of increased rainfall in March and April, salinity declined to values between 6 and 8 psu. At that time, the dominant species made up more than 60 % of the total biomass and density and Hill's index of diversity (N1) declined, whereas the number of species (N0) and evenness (E2) did not change. After April, rainfall decreased, and density and biomass returned to levels similar to those before the rainy season. The number of species and the density and biomass in the mangrove tidal creeks are compared with published data for other tropical and subtropical estuaries. Migration trends were inferred from the results of the seasonal fluctuations of density and biomass of the most important species in the Furo do Meio, and are compared with data from other studies in the main channel of the Caete Estuary.
机译：本研究调查了在大潮区涨潮期间潮间带红树林中鱼类的种类。我们描述了巴西Caete河口Furo do Meio潮汐小溪中鱼类组成组成与生物量，密度和种类数量相关的季节性变化。使用封锁网共捕获了26个科的49种29107个人。它们的总重量为526 kg（总密度为0.11 ind。（-2），总生物量为2.1 g m。（-2））。对渔获量数据的分析表明，小溪之间的物种数量差异很大，而不同季节之间的鱼类总生物量差异很大。两个最重要的物种Catholops pleurops和Colomesus psittacus的密度和生物量在季节之间存在显着差异。百日草，Pterengraulis atherinoides，Pseudauch-nipterus nodosus和Stellifer naso的密度和生物量显示出明显的时间差异。小溪之间的密度和生物量在An鱼和非洲沙丁鱼之间存在显着差异。富美杜河小河中鱼类区系的丰度-生物量比较（ABC）图表明，在雨季开始时，优势种的数量和重量增加。由于三月和四月降雨增加，盐度下降到6至8 psu。当时，优势种占总生物量和密度的60％以上，希尔的多样性指数（N1）下降，而物种数（N0）和均匀度（E2）不变。 4月之后，降雨减少，密度和生物量恢复到与雨季前相似的水平。将红树林潮汐小溪中的物种数量以及密度和生物量与其他热带和亚热带河口的已发布数据进行了比较。迁移趋势是根据Furo do Meio最重要物种的密度和生物量的季节性波动结果得出的，并与Caete河口主要渠道的其他研究数据进行了比较。

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