...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Aquatic Sciences >Long-term stability of cladoceran assemblages in small, shallow, Canadian Shield lakes experiencing marked calcium declines
【24h】

Long-term stability of cladoceran assemblages in small, shallow, Canadian Shield lakes experiencing marked calcium declines

机译：小型，浅水加拿大盾湖中锁骨鱼类组合的长期稳定性出现明显的钙下降

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A greater appreciation of biotic responses to environmental changes is warranted in small, shallow lakes because of the high number of these habitats, and their unique contributions to regional biodiversity. Furthermore, recent water chemistry monitoring data show that shallow lakes in Ontario are sensitive and have responded significantly to environmental stressors such as acid deposition and lake water calcium decline. Here, we use paleoecological techniques to examine cladoceran assemblages in modern and pre-industrial sediments of 30 shallow lakes to determine the key environmental gradients that influence present-day assemblages, and to assess how assemblage structure has changed since pre-industrial times (pre-1850s). Redundancy analysis of present-day cladoceran assemblages and key environmental variables identified lake surface area and Secchi depth as significant predictors of assemblage composition. In our data set, Secchi depth was not correlated to water clarity but rather to macrophyte cover, suggesting that cladoceran assemblages were highly influenced by habitat structure. In contrast to nearby, deeper lakes, where pelagic cladoceran taxa have changed significantly in relative abundance over time, cladoceran assemblages in present-day and pre-industrial sediments of shallow lakes did not differ significantly in composition. While the specific reasons for this muted response are unknown, we hypothesize that: (1) littoral taxa may be less sensitive to low Ca concentrations, or ecological thresholds have not yet been crossed or are lower for littoral taxa; (2) calcium availability may vary spatially within shallow lakes, and this is not captured in a single measure of water chemistry from the centre of the lake; and/or (3) habitat structure is more important than water chemistry as a predictor of assemblage composition in these study lakes, and this has not changed significantly over time.
机译：由于这些生境数量众多，而且它们对区域生物多样性的独特贡献，因此有必要在较小的浅水湖泊中更好地了解生物对环境变化的反应。此外，最近的水化学监测数据表明，安大略省的浅湖非常敏感，并且对环境压力（例如酸沉降和湖水钙下降）有显着响应。在这里，我们使用古生态技术研究了30个浅湖的现代和工业化前沉积物中的角藻类组合，以确定了影响当今组合的关键环境梯度，并评估了自工业化前时代以来组合结构如何变化（ 1850年代）。对当今锁骨珊瑚组合和关键环境变量的冗余分析确定，湖的表面积和塞基深度是组合物组成的重要预测指标。在我们的数据集中，Secchi深度与水的透明度无关，而与大型植物的覆盖率相关，这表明枝角类动物的组合受生境结构的影响很大。与附近较深的湖泊形成鲜明对比的是，中上层克拉德角类群的相对丰度随着时间的推移而发生了显着变化，而如今浅湖中和工业界前沉积物中的克拉德角类群组成在组成上没有显着差异。尽管这种沉默反应的具体原因尚不清楚，但我们假设：（1）沿海分类群可能对低Ca浓度不太敏感，或者尚未超过生态阈值，或者对于沿海分类群而言较低； （2）浅湖中钙的有效性可能在空间上有所变化，而这并不能通过湖中心的水化学方法来获得。和/或（3）在这些研究湖泊中，栖息地结构比水化学更重要，可作为组合物组成的预测指标，并且随着时间的推移，这种变化没有显着变化。

著录项

  • 来源
    《Aquatic Sciences》 |2015年第4期|547-561|共15页
  • 作者

    Mosscrop L. E.; Paterson A. M.; DeSellas A. M.; Kurek J.; Weeber R.; Smol J. P.;

  • 作者单位

    Queens Univ, Dept Biol, Paleoecol Environm Assessment & Res Lab, Kingston, ON K7L 3N6, Canada;

    Dorset Environm Sci Ctr, Ontario Minist Environm & Climate Change, Dorset, ON P0A 1E0, Canada;

    Dorset Environm Sci Ctr, Ontario Minist Environm & Climate Change, Dorset, ON P0A 1E0, Canada;

    Mt Allison Univ, Dept Geog & Environm, Sackville, NB E4L 1A7, Canada;

    Environm Canada, Canadian Wildlife Serv Ontario Reg, Ottawa, ON K1A 0H3, Canada;

    Queens Univ, Dept Biol, Paleoecol Environm Assessment & Res Lab, Kingston, ON K7L 3N6, Canada;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Canadian Shield; Calcium; Cladocera; Paleolimnology; Shallow lakes;

    机译：加拿大盾;钙;克拉德克拉（Cladocera）;古湖泊学;浅水湖泊;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号