Abstract We performed an ostracod taxonomic analysis on samples from a shallow lake (Runtuyoc Lake) in north-western Argentina in order to contribute to the understanding of the evolution of this water body through the last 5000 years. The ostracod assemblages consist of 15 species, two species exclusively from modern samples (Herpetocypris helenae and Chlamydotheca incisa), 8 exclusively from Quaternary samples (Limnocythere jujunensis sp. nov., L. titicaca, L. alexanderi, L. aff. staplini, Cyprideis salebrosa, Penthesilenula incae, Cypridopsis vidua, Sarscypridopsis aculeata) and 5 from both, modern and Quaternary samples (Ilyocypris ramirezi, Potamocypris smaragdina, Heterocypris incongruens, Heterocypris similis, Candona sp.). The lake is located in the Miraflores river course and is characterized nowadays by freshwater conditions, but a saline past is evident as it went through different periods of desiccation. From 5500 to 3000 cal a BP, the lake was absent, probably related to extreme dry conditions. Then, water inputs into the lake produced a saline shallow lake until to reach modern setting as a freshwater body basin. Runtuyoc lake records, supports the regional environmental trending change for the Argentinian northwest, with wetter conditions in the early and late Holocene, and arid for the middle Holocene at least from 5500 to 3000/2500 cal a BP.

中文翻译：

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阿根廷北部 Runtuyoc 湖第四纪非海洋介形动物：新的分类描述和对全新世古环境的影响

摘要 我们对阿根廷西北部一个浅湖（Runtuyoc 湖）的样本进行了介形动物分类分析，以帮助了解过去 5000 年来该水体的演变。介形虫组合由 15 种组成，两种完全来自现代样本（Herpetocypris helenae 和 Chlamydotheca incisa），8 种完全来自第四纪样本（Limnocythere jujunensis sp. nov., L. titicaca, L. alexanderi, L. aff. staplini, Cyprides salebrosa、Penthesilenula incae、Cypridopsis vidua、Sarscypridopsis aculeata）和来自现代和第四纪样品的 5 个（Ilyocypris ramirezi、Potamocypris smaragdina、Heterocypris incongruens、Heterocypris similis、Candona sp.）。该湖位于米拉弗洛雷斯河道，如今的特点是淡水条件，但在经历了不同的干燥时期后，它的咸水过去是显而易见的。从 5500 到 3000 cal a BP，湖不存在，可能与极端干燥的条件有关。然后，进入湖中的水产生了咸水浅湖，直到现代环境成为淡水体盆地。Runtuyoc 湖记录支持阿根廷西北部的区域环境趋势变化，全新世早期和晚期的湿润条件，以及全新世中期的干旱，至少从 5500 到 3000/2500 cal a BP。