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首页> 外文期刊>Aquatic Sciences >Seasonal succession of cyanobacterial protease inhibitors and Daphnia magna genotypes in a eutrophic Swedish lake
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Seasonal succession of cyanobacterial protease inhibitors and Daphnia magna genotypes in a eutrophic Swedish lake

机译：富营养化瑞典湖中蓝藻蛋白酶抑制剂和大型蚤的季节性演替

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摘要

Lakes are well known for having a pattern of seasonal succession of phytoplankton and zooplankton. The succession of different taxa of phytoplankton results in a succession of zooplankton taxa, and within the genus Daphnia, into a succession of different genotypes (clones). One cause for this succession of Daphnia clones might be the production of digestive protease inhibitors by cyano-bacteria, which usually bloom in summer. Here we report seasonal changes in the frequency and the abundance of Daphnia magna haplotypes in a eutrophic lake, which developed a chymotrypsin-inhibitor-producing cyanobacterial bloom in May. These seasonal changes were not related to changes of biotic and abiotic lake parameters. However, a very high content of chymotrypsin inhibitors was observed in May (but not in other months). This was assumed to have exerted a strong punctual selection pressure on the Daphnia population and on the direct targets of the protease inhibitors, i.e. the digestive chymotrypsins of Daphnia. Actually, D. magna from before and during the cyanobacterial bloom showed a different protease pattern on activity stained SDS-PAGE in comparison to clones from the month after the bloom. However, no difference in tolerance, measured as IC_(50) values, to inhibition by natural lake seston from May was found between the clones from before and after the bloom. Thus, the hypothesis that a seasonal adaptation of D. magna subpopulations from either April/May or June might have occurred could not be proven. This suggests that the Daphnia population investigated here is locally adapted to cyanobacterial protease inhibitors.
机译：湖泊以浮游植物和浮游植物的季节性演替模式而闻名。浮游植物不同分类单元的演替导致浮游动物分类单元的演替，而在水蚤属中，则导致了一系列不同基因型（克隆）的演替。引起水蚤克隆的原因之一可能是蓝细菌产生的消化蛋白酶抑制剂，蓝细菌通常在夏天开花。在这里，我们报告了富营养化湖泊中水蚤（Daphnia magna）单倍型的频率和数量的季节性变化，该湖泊在5月形成了胰凝乳蛋白酶抑制剂产生的蓝藻花开。这些季节性变化与生物和非生物湖泊参数的变化无关。但是，在5月（但其他月份没有）观察到胰凝乳蛋白酶抑制剂的含量很高。假定这对水蚤种群和蛋白酶抑制剂（即水蚤的消化胰凝乳蛋白酶）的直接靶标施加了较强的准时选择压力。实际上，与开花后一个月的克隆相比，蓝藻开花之前和期间的D. magna在活性染色的SDS-PAGE上显示出不同的蛋白酶模式。但是，在开花前后的克隆之间未发现对5月起天然湖塞斯顿抑制的耐受性（以IC_（50）值衡量）。因此，无法证明可能发生了4月，5月或6月D. magna亚种群的季节性适应的假说。这表明这里研究的水蚤种群在局部适应了蓝细菌蛋白酶抑制剂。

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