Cladocera and Anostraca from the Interior Plateau of British Columbia, Canada, as paleolimnological indicators of salinity and lake level
Cladocera and Anostraca from the Interior Plateau of British Columbia, Canada, as paleolimnological indicators of salinity and lake level
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DOI：
10.1023/a:1003542709450
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发表时间：
1999-01-01
期刊：
影响因子：
2.6
通讯作者：
Smol, JP
中科院分区：
文献类型：
--
作者：
Bos, DG;Cumming, BF;Smol, JP
从不列颠哥伦比亚省内陆高原南部33个闭盆型湖泊的表层沉积物中鉴定出枝角类和管角类物种组合，以探索它们作为湖水盐度和离子组成定量指标的有效性。选择这些湖泊是为了最大限度地提高湖水盐度浓度(通过高盐度的淡水)和卤水成分(以硫酸盐和碳酸盐为主的体系)的范围。脊椎动物和枝角类的分布与湖水盐度、离子组成和湖泊深度密切相关。基于这些强大的联系，利用加权平均技术，开发了重要的预测模型，以基于表层沉积物中的悬钩虫和枝角类的物种组成来推断湖水盐度。此外，开发了基于浮游/滨海枝角类比率的模型来推断湖泊深度，这种模型优于以前使用的技术。鉴于脊椎动物和枝角类的物种组成可以用来推断盐度和湖泊水位的变化，而且它们的遗骸可以从沉积剖面中识别出来，因此利用它们的组合作为过去气候条件的古湖相指示有相当大的潜力。
Cladoceran and anostracan species assemblages were identified from the surface sediments of 33 closed-basin lakes from the southern Interior Plateau of B.C. in order to explore their effectiveness as quantitative indicators of lakewater salinity and ionic composition. These lakes were chosen to maximize the range of lakewater salinity concentrations (freshwater through hypersaline) as well as brine composition (sulphate and carbonate dominated systems). The distribution of the anostracans and cladocerans were strongly correlated with lakewater salinity, ionic composition and lake depth. Based on these strong relationships significant predictive models were developed, using weighted-averaging techniques, to infer lakewater salinity based on the species composition of anostracans and cladocerans in surface sediments. Furthermore, models were developed to infer lake depth that are superior to previously used techniques based on the ratio of planktonic/littoral Cladocera. Given that the species composition of anostracans and cladocerans can be used to infer changes in salinity and lake level, and that their remains can be identified from sedimentary profiles, there is considerable potential in using their assemblages as paleolimnological indicators of past climatic conditions.