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首页> 外文期刊>Latin american journal of aquatic research >Zooplankton diversity and its relationship with environmental changes after the filling of a temporary saline lake in the semi-arid region of La Pampa, Argentina
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Zooplankton diversity and its relationship with environmental changes after the filling of a temporary saline lake in the semi-arid region of La Pampa, Argentina

机译：阿根廷拉潘帕半干旱地区的临时盐湖充水后，浮游动物的多样性及其与环境变化的关系

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Temporary water bodies can remain active as such for varying periods. However, they are reservoirs (as "egg banks") of species adapted to these special conditions. In central Argentina, there are numerous temporary lakes, which have only recently begun to be studied. The aim of this work was to describe the succession of changes in diversity, abundance and biomass of zooplankton as well as in the environment, over a period of eleven months, as from the filling of a temporary saline lake, and test the hypothesis that i) salinity affects negatively the richness and abundance but positively the biomass, and ii) due to changes in environmental conditions produced by advancing the hydroperiod, different species emerge from the egg bank at different times. At the beginning, when salinity was reduced and the concentration of chlorophyll-α was higher, we recorded the highest diversity, due mainly by less tolerance species. Later, as salinity increased, the macrophyta Ruppia cirrhosa developed and covered 90% of the surface of the lake, the concentration of chlorophyll-α decreased and the water transparency increased. The zooplankton richness decreased and the community was integrated only by halotolerant species. In the first two months, there was an increased replacement of species, indicated by the high value of Whittaker's beta diversity index (0.63), the density was high, with a predominance of microzooplankton, so the registered biomass was relatively reduced. Then, abundance decreased markedly, and was mostly dominated by macrozooplankton, so the biomass increased. When salinity exceeded 11 g L-1, there was a predominance of the halophilic cladoceran Daphnia menucoensis, a species of ecological importance because it's high grazing pressure on phytoplankton. In this study, in addition to the modulating effect of salinity on the richness, abundance and zooplankton biomass, it was verified that the diversity present in the egg bank of temporary saline lakes is higher than that recorded in the water column at any time during hydrophases.
机译：临时水体可以在不同时期保持活跃。但是，它们是适应这些特殊条件的物种的水库（作为“卵库”）。在阿根廷中部，有许多临时湖泊，直到最近才开始对其进行研究。这项工作的目的是描述从填充临时盐湖开始的11个月期间浮游动物以及环境中浮游动物的多样性，丰度和生物量的连续变化，并检验以下假设： ）盐度对丰富度和丰度有负面影响，但对生物量却有正面影响，并且ii）由于加水期产生的环境条件变化，不同时间段的卵库中会出现不同的物种。最初，当盐度降低且叶绿素-α浓度较高时，我们记录了最高的多样性，这主要是由于耐受性较低的物种所致。后来，随着盐度的增加，大型植物罗非鱼（Ruppi cirrhosa）发育并覆盖了湖面的90％，叶绿素-α的浓度降低，水的透明度增加。浮游动物的丰富度下降了，而该群落仅由耐盐类物种整合。在最初的两个月中，物种的替换增加了，这由惠特克的β多样性指数（0.63）的高值表明，密度很高，以微浮游动物为主，因此注册生物量相对减少。然后，丰度显着下降，并且主要由大型浮游动物主导，因此生物量增加。当盐度超过11 g L-1时，嗜盐的枝角Da Daphnia menucoensis占主导地位，这是一种具有生态重要性的物种，因为它对浮游植物的放牧压力很高。在这项研究中，除了盐度对丰富度，丰度和浮游生物量的调节作用外，还证实了临时盐湖卵库中存在的多样性高于水相在任何时候的水柱中记录的多样性。 。

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