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Holocene to Recent Ostracoda of Lake Sevan, Armenia: biodiversity and ecological controls

机译：全新世至亚美尼亚塞凡湖最近的纲目：生物多样性和生态控制

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摘要

The morphology and dynamics of Lake Sevan, Armenia, have abruptly changed on several occasions during the Holocene. Arguably the most significant events took place about 4000 years BP, when a phase of aridity greatly reduced the size of the lake and about 2100BP when the combined effect of an episode of volcanic activity that dammed the single outlet to the basin and the initiation of a wetter climatic phase, culminated in the development of the modern lake. Archaeological evidence indicates the extent of the first event, while the development of aquatic communities and increase in diversity of, for example, ostracods, characterises the second. Recent environmental stress, caused by a significant drop in water level due to human activity has resulted in changes in the ecosystem and food chain, resulting in a decline in ostracod diversity compared to both the earlier Holocene and sub-Recent. The living fauna is characterised by abundant Candona neglecta and Cyprideis torosa, common sexually reproducing Litnnocythere inopinata, and less common Fabaeformiscandona caucasica, Candona candida, Cyclocypris ovum, Cypria ophthalmica and Darwinula stevensoni
机译：在全新世期间，亚美尼亚塞凡湖的形态和动力学已经发生了几次突变。可以说，最重大的事件发生在大约4,000年BP，这是由于干旱阶段极大地减少了湖泊的大小，而大约2100BP则发生在火山活动发作的共同作用下，该事件阻止了该盆地的单个出口并引发了一次大地震。气候湿润的阶段，导致了现代湖泊的发展。考古学证据表明了第一次事件的严重性，而第二个阶段则是水生生物群落的发展和例如兽类的多样性增加。由于人类活动导致水位大幅下降，最近造成的环境压力导致生态系统和食物链的变化，与早期的全新世和近现代的相比，导致了兽类多样性的下降。活着的动物群的特征是丰富的念珠菌和圆环蛾，有性繁殖Litnnocythere inopinata，而少见的Fabaeformiscandona caucasica，Candona candida，Cyclocypris ovum，Cypria ophthalmica和Darwinula stevensoni

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