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首页> 外文期刊>Belgian Journal of Zoology >Autecology of the extant ostracod fauna of Lake Ohrid and adjacent waters - A key to paleoenvironmental reconstruction
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Autecology of the extant ostracod fauna of Lake Ohrid and adjacent waters - A key to paleoenvironmental reconstruction

机译：奥赫里德湖及邻近水域现存的兽类动物的自相生态学-古环境重建的关键

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摘要

Understanding the ecology of bioindicators such as ostracods is essential in order to reconstruct past environmental and climate change from analysis of fossil assemblages preserved in lake sediment cores. Knowledge of the ecology of ancient Lake Ohrid's ostracod fauna is very limited and open to debate. In advance of the Ohrid ICDP-Drilling project, which has potential to generate high-resolution long-term paleoenvironmental data of global importance in paleoclimate research, we sampled Lake Ohrid and a wide range of habitat types in its surroundings to assess 1) the composition of ostracod assemblages in lakes, springs, streams, and shortlived seasonal water bodies, 2) the geographical distribution of ostracods, and 3) the ecological characteristics of individual ostracod species. In total, 40 species were collected alive, and seven species were preserved as valves and empty carapaces. Of the 40 ostracod species, twelve were endemic to Lake Ohrid. The most common genus in the lake was Candona, represented by 13 living species, followed by Paralimnocythere, represented by fve living species. The most frequent species was Cypria obliqua. species with distinct distributions included Heterocypris incongruens, Candonopsis kingsleii, and Cypria lacustris. The most common species in shallow, fooded areas was H. incongruens, and the most prominent species in ditches was C. kingsleii. C. lacustris was widely distributed in channels, springs, lakes, and rivers. statistical analyses were performed on a "Lake Ohrid" dataset, comprising the subset of samples from Lake Ohrid alone, and an "entire" dataset comprising all samples collected. The unweighted pair group mean average (UPGMA) clustering was mainly controlled by species-specifc depth preferences. Canonical Correspondence Analysis (CCA) with forward selection identifed water depth, water temperature, and pH as variables that best explained the ostracod distribution in Lake Ohrid. The lack of signifcance of conductivity and dissolved oxygen in CCA of Ohrid data highlight the uniformity across the lake of the well-mixed waters. In the entire area, CCA revealed that ostracod distribution was best explained by water depth, salinity, conductivity, pH, and dissolved oxygen. salinity was probably selected by CCA due to the presence of Eucypris virens and Bradleystrandesia reticulata in short-lived seasonal water bodies. Water depth is an important, although indirect, infuence on ostracod species distribution, which is probably associated with other factors such as sediment texture and food supply. some species appeared to be indicators for multiple environmental variables, such as lake level and water temperature.
机译：为了通过分析沉积在湖泊沉积物核心中的化石组合物来重建过去的环境和气候变化，了解生物指示剂（例如线虫）的生态至关重要。关于奥赫里德湖古代兽类动物区系生态学的知识非常有限，尚有争议。在进行奥赫里德ICDP钻探项目之前，该项目有可能生成在古气候研究中具有全球重要性的高分辨率长期古环境数据，我们对奥赫里德湖及其周围的各种生境类型进行了采样，以评估1）组成湖泊，泉水，溪流和短命的季节性水体中的成虫组合; 2）成虫的地理分布; 3）个别成虫物种的生态特征。总共活着收集了40种，其中7种被保存为瓣膜和空的甲壳。在40种兽脚类中，有12种是奥赫里德湖特有的。湖中最常见的属是Candona，以13种生物为代表，其次是Paralimnocythere，以5种生物为代表。最常见的物种是斜Cy。具有明显分布的物种包括Heterocypris incongruens，Candonopsis kingsleii和Cypria lacustris。在浅水食物区最常见的物种是H. incongruens，在沟渠中最突出的物种是金氏梭菌。 C. lacustris广泛分布于渠道，温泉，湖泊和河流。对“奥赫里德湖”数据集（包括仅来自奥赫里德湖的样本子集）和“整个”数据集（包括收集的所有样本）进行统计分析。未加权对组平均均值（UPGMA）聚类主要受物种特定深度偏好的控制。具有正向选择的规范对应分析（CCA）将水深，水温和pH值确定为最能解释奥赫里德湖中成龙分布的变量。 Ohrid数据的CCA中缺乏电导率和溶解氧的显着性，这突显了整个混水湖的均匀性。在整个地区，CCA揭示了通过水深，盐度，电导率，pH值和溶解氧可以最好地解释类固醇的分布。 CCA可能选择了盐度，这是因为在短命的季节性水体中存在着金丝藻和网纹布拉德斯网。水深对成虫种类的分布有重要的影响，尽管是间接的，这可能与其他因素有关，如沉积物质地和食物供应。一些物种似乎是多种环境变量的指标，例如湖泊水位和水温。

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