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首页> 外文期刊>Estuarine Coastal and Shelf Science >Intra-annual variability of phytoplankton biomass and nutrients in a tropical estuary during a severe drought
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Intra-annual variability of phytoplankton biomass and nutrients in a tropical estuary during a severe drought

机译：严重干旱期间热带河口浮游植物生物量和养分的年内变化

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摘要

This study describes the infra-annual variability of environmental characteristics, hydrologic regime and their potential consequences for phytoplankton biomass in a low-inflow estuary on the Brazilian semi-arid coast. The estuary was subjected to two conditions based on the water and salt balance: a short hyposaline and a long hypersaline period. They were marked by considerable differences in precipitation, evaporation and water flushing time that resulted in noticeable variations in the salinity gradients, nutrient concentrations and total phytoplankton biomass (TPB). TPB peaked at the middle and end of the dry season, when salinity reached maximum levels (up to 63) and the water residence time was higher. Higher TPB was also related to a decline in inorganic nitrogen due to phytoplankton uptake and a decline in water transparency due to phytoplankton shading. Rainfall rather than drought constituted a disturbance for the phytoplankton as TPB declined in the rainy period despite available nutrients. Given the prevalent climate change, increases are predicted in the frequency and intensity of droughts and salinity in estuaries. Although the phytoplankton community seemed adapted, the limits of its adaptability and the effects of hypersalinity should be further evaluated.
机译：这项研究描述了巴西半干旱海岸低流入河口的环境特征，水文状况及其对浮游植物生物量的潜在后果的年际变化。根据水和盐分的平衡，河口处于两个条件下：短生理盐水和长生理盐水。它们的特征是降水，蒸发和冲洗时间的显着差异，导致盐度梯度，养分浓度和浮游植物总生物量（TPB）出现明显变化。当盐分达到最高水平（最高63）并且水停留时间更长时，TPB在干旱季节的中后期达到峰值。 TPB的升高还与浮游植物摄取引起的无机氮减少和浮游植物遮荫引起的水透明度降低有关。尽管有养分，但雨季TPB下降，降雨而不是干旱对浮游植物构成干扰。考虑到普遍的气候变化，预计河口干旱和盐碱化的频率和强度将会增加。尽管浮游植物群落似乎已适应，但应进一步评估其适应性的极限和高盐度的影响。

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