• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Lakes & Reservoirs >Large freshwater lakes in arid Australia: A review of their limnology and threats to their future
【24h】

Large freshwater lakes in arid Australia: A review of their limnology and threats to their future

机译：澳大利亚干旱地区的大型淡水湖泊：湖泊学及其对未来的威胁

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

Large freshwater lakes in Australia’s arid zone are episodic due to highly variable inflows from allogenic rivers. A few receive enough inflow almost yearly to be permanent, despite large losses from high evaporation. Biodiversity is high, with most taxonomic groups represented, and is largely endemic at the continental scale. There is almost no regional endemism, which is at variance with other major aquatic habitat types in Australia. Abundance fluctuates greatly, with invertebrates and fish booming and busting with floodwater input, but birds generally reach greatest numbers later in the cycle as they gather on the more persistent waters. Invertebrate assemblages are influenced by the degree of lake permanence, turbidity and salinity, providing a temporally variable mosiac of environments throughout a lake system and between systems and with time. Unlike other groups, fish are not speciose, but are important predators in most systems with breeding coinciding with flooding. This favours native species against exotics in the Coongie Lakes but, in the Paroo, exotics are common in permanent waters. Waterbirds are the very obvious components in these variable systems, using their resources for feeding and breeding. Most are extremely nomadic to take advantage of the variable habitat. Two of the most important lake systems, the Coongie Lakes on Cooper Creek and the Paroo lakes in the northwestern Murray Darling catchment, are threatened by water abstraction upstream for irrigation, so that important habitat may be lost. In addition, the lakes will become less variable and, so, possibly compromise their character with cascading effects through the ecosystem. Some smaller lakes are adversely impacted by accelerated sedimentation.
机译：由于来自异源河的流入量变化很大，澳大利亚干旱区的大型淡水湖是偶发性的。尽管由于蒸发量大而损失惨重，但仍有少数几乎每年都获得足够的流入量以保持永久性。生物多样性很高，代表了大多数生物分类群，并且在大陆范围内很普遍。几乎没有区域特有的物种，与澳大利亚其他主要的水生生境类型不同。丰度波动很大，无脊椎动物和鱼类随着洪水的涌入而繁荣兴隆，但随着它们聚集在更持久的水域上，鸟类通常在周期的后期达到最大数量。无脊椎动物的组合受湖泊的持久性，浊度和盐度的影响，从而在整个湖泊系统中以及各系统之间以及随时间推移而提供了随时间变化的环境。与其他群体不同，鱼类不是特有的，而是在大多数系统中重要的捕食者，繁殖与洪水相吻合。这有利于本地物种抵御Coongie湖中的外来物种，但在Paroo中，外来物种在永久水域中很常见。水鸟是这些可变系统中非常明显的组成部分，它们利用它们的资源进行饲养和繁殖。大多数人都非常游牧，以利用变化多端的栖息地。最重要的两个湖泊系统是库珀河上的Coongie湖和西北Murray Darling流域的Paroo湖，都受到上游灌溉用水的威胁，因此可能失去重要的栖息地。此外，湖泊将变得不那么易变，因此可能会通过生态系统的级联效应而损害其特性。一些较小的湖泊受到加速沉积的不利影响。

著录项

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