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首页> 外文期刊>Estuarine Coastal and Shelf Science >The zooplankton community of the Mpenjati Estuary, a South African temporarily open/closed system
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The zooplankton community of the Mpenjati Estuary, a South African temporarily open/closed system

机译：南非临时开放/关闭系统姆彭贾蒂河口的浮游动物群落

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摘要

The aim of this study was to examine spatial and temporal variability in zooplankton abundance and biomass, both during the closed (dry season) and open (wet season) phases of the Mpenjati Estuary, South Africa. On average, nighttime abundance values were 1-3 orders of magnitude higher than daytime values. A total of 51 and 36 zooplankton taxa were identified during the open and closed phases, respectively. The estuarine species Pseudodiaptomus hessei, Acartia nalalensis and Gastrosaccus brevifissura dominated the assemblage during both phases. During the open phase marine zooplankton species entered the estuary and increased the zooplankton species diversity. At the same time, the biomass of the estuarine zooplankton species decreased substantially due to scouring of the sediment, increase in salinity and turbulence, and possibly also in grazing pressure. Conversely, during the closed phase the zooplankton diversity decreased, since no marine organisms entered the estuary, but the biomass of typical estuarine species increased due to the stability of the estuary. The fluctuations in the zooplankton community structure between the closed and the open phases suggest that the opening and the closing of the estuary are very important processes in determining the food web of the estuary.
机译：这项研究的目的是在南非Mpenjati河口的封闭（干燥季节）和开放（潮湿季节）阶段研究浮游动物丰度和生物量的时空变化。平均而言，夜间丰度值比白天高1-3个数量级。在开放和封闭阶段分别确定了总共51个和36个浮游动物类群。在这两个阶段，河口假单胞菌（Pseudodiaptomus hessei），纳卡菌（Acartia nalalensis）和短小天麻（Gastrosaccus brevifissura）占主导地位。在开放阶段，海洋浮游动物进入河口，增加了浮游动物的多样性。同时，由于沉积物的冲刷，盐度和湍流的增加以及放牧压力的增加，河口浮游动物的生物量大大减少。相反，在封闭阶段，浮游动物的多样性下降，因为没有海洋生物进入河口，但是由于河口的稳定性，典型河口物种的生物量增加了。封闭期和开放期之间浮游动物群落结构的波动表明，河口的开放和关闭是确定河口食物网的非常重要的过程。

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