Lacustrine sedimentary records and the proxies contained within them are valuable archives of past climate. However, the resolution of these records is frequently coarse or contains a high degree of uncertainty, making it difficult to resolve how climatic variability impacts the ecosystems on which humans depend. The goal of this study is to couple recent sediment cores sampled at centimeter-scale resolution with paleo- and historical information about lake levels to document how changes in the paleoenvironment impact the paleoecology of a rift basin lake. We present multiproxy data from three short cores collected from Ferguson's Gulf (FG), a shallow embayment connected to the western shore of Lake Turkana, Kenya. Five distinct biozones were interpreted on the basis of ostracods and geochemistry (δ18O, δ13C, and major elements), spanning the Little Ice Age (LIA) to the modern. Overall, ostracod total abundance and assemblage diversity decreased up-core, with the largest total abundance and genera diversity occurring during the LIA. This fits with regional datasets that indicate the Eastern Branch of the East African Rift System was wetter during the LIA than it is today. This also suggests that human impact in and around Lake Turkana has weakened the resiliency of the ecosystems in FG.

中文翻译：

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基于沉积学和介形虫组合的小冰期到肯尼亚图尔卡纳湖弗格森湾的现代湖平面波动

湖泊沉积记录和其中包含的代理是过去气候的宝贵档案。然而，这些记录的分辨率通常很粗糙或包含高度的不确定性，因此很难解决气候变化如何影响人类赖以生存的生态系统。本研究的目的是将最近以厘米级分辨率采样的沉积物岩心与有关湖泊水位的古和历史信息相结合，以记录古环境的变化如何影响裂谷盆地湖泊的古生态。我们展示了从弗格森湾 (FG) 收集的三个短岩心的多代理数据，这是一个与肯尼亚图尔卡纳湖西岸相连的浅海湾。根据介形虫和地球化学（δ18O, δ13C 和主要元素），跨越小冰河时代 (LIA) 到现代。总体而言，介形类总丰度和组合多样性在核上下降，其中最大的总丰度和属多样性发生在 LIA 期间。这与表明东非裂谷系统东部分支在 LIA 期间比现在更潮湿的区域数据集相吻合。这也表明，图尔卡纳湖及其周边地区的人类影响削弱了 FG 生态系统的弹性。