• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Do piscivorous fish have cascading impacts on lower trophic levels in coral reef environment: Comparisons of food web interactions in back reef and fore reef environments.
【24h】

Do piscivorous fish have cascading impacts on lower trophic levels in coral reef environment: Comparisons of food web interactions in back reef and fore reef environments.

机译：食鱼鱼类是否对珊瑚礁环境中的较低营养水平具有连锁影响：在后礁和前礁环境中食物网相互作用的比较。

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

Many studies show that the removal of large predators can have strong and cascading impacts in simple food webs. In contrast, few studies have found these same impacts in species-rich food webs following similar removals of large predators. Why this is so remains uncertain, but we predict that this discrepancy is due more to extremely patchy distributions of large predators than to an overall absence of strong top down effects on lower order consumers in diverse systems. To test this prediction, we compared the impacts of variation in piscivore density and species assemblage on the composition, density and feeding rates of invertivores between two back reefs (piscivore-poor settings) and fore reefs (piscivore-rich settings) in the Florida Keys. Visual census methods were used to document piscivore impacts on invertivore density and composition. Underwater video recordings, in addition to two forms of tethering experiments, were used to document impacts of larger predators on invertivore predation rates. The results showed that when piscivores are abundant they significantly impact small invertivore abundance and overall invertivore feeding rates. Our findings also illustrate that the intensity of trophic cascades can vary greatly over very small spatial scales.
机译：许多研究表明，清除大型捕食者会对简单食物网产生强大而连锁的影响。相比之下，很少有研究发现类似的清除大型捕食者后在物种丰富的食物网中也有同样的影响。为何如此仍不确定，但我们预测，这种差异更多是由于大型捕食者的分布极为零散，而不是由于总体上对各种系统中的低阶消费者没有强大的自上而下的影响。为了检验这一预测，我们比较了佛罗里达键区两个食礁（食肉动物贫瘠的环境）和前礁（食肉动物丰富的环境）之间食肉动物密度和物种组成的变化对食肉动物的组成，密度和摄食率的影响。 。视觉普查方法用于记录食肉动物对食肉动物密度和组成的影响。除了两种形式的系留实验外，水下录像还用于记录大型捕食者对食肉动物捕食率的影响。结果表明，当食肉动物丰富时，它们会显着影响小的食肉动物的丰度和总体食肉动物的进食速度。我们的发现还表明，营养级联的强度可以在很小的空间尺度上变化很大。

著录项

  • 作者

    Puntila, Riikka.;

  • 作者单位

    University of South Alabama.;

  • 授予单位 University of South Alabama.;
  • 学科 Biology Ecology.;Agriculture Fisheries and Aquaculture.
  • 学位 M.S.
  • 年度 2010
  • 页码 57 p.
  • 总页数 57
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 药物化学;
  • 关键词

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