• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Estuarine Coastal and Shelf Science >Accuracy of pitfall traps for monitoring populations of the amphipod Orchestia gammarella (Pallas 1766) in saltmarshes
【24h】

Accuracy of pitfall traps for monitoring populations of the amphipod Orchestia gammarella (Pallas 1766) in saltmarshes

机译：盐陷阱中用于监测两栖类Orchestia gammarella（Pallas 1766）种群的陷阱的准确性

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

The intertidal amphipod Orchestia gammarella displays a key role in the functioning of sand and salt marsh habitats, mainly due to its role in decomposition processes and as a main prey item for fish and birds. This study evaluates the accuracy of two sampling methods for estimating population size, biomass and cohort composition. Pitfall trapping, a passive and easily displayed method, was compared with the depletion of quadrats, an active and time-consuming method, considered here as the reference method. Sampling took place in North-West European saltmarshes (Mont Saint-Michel Bay, France) during the summer, 2003 (64 replicates per method). Linear regression revealed that activity-densities (number of individuals per trap) were strongly and positively correlated with densities (number of individuals per quadrat). Dry biomasses obtained from the two sampling methods were also significantly and positively correlated, but with a low coefficient of correlation. Cohort composition differed between the methods, with proportionally less juveniles and more intermediates in pitfall traps. We conclude that pitfall traps can be used for easily monitoring changes in the size, and to a lesser extent for measuring the biomass, of an amphipod population, but not for estimating its cohort composition.
机译：潮间两栖动物Orchestia gammarella在沙和盐沼栖息地的功能中发挥关键作用，这主要是由于其在分解过程中的作用以及作为鱼类和鸟类的主要猎物。这项研究评估了两种估计人口规模，生物量和队列组成的抽样方法的准确性。陷阱陷阱（一种被动且易于显示的方法）与四方类的消耗（一种主动且耗时的方法）进行了比较，在这里被视为参考方法。 2003年夏季，在北欧盐沼（法国圣米歇尔湾）进行了采样（每种方法重复64次）。线性回归显示，活动密度（每个陷阱的个体数）与密度（每个四方体的个体数）成正相关。从两种采样方法获得的干生物量也呈显着正相关，但相关系数较低。两种方法的队列组成有所不同，成年陷阱中的幼虫成比例减少，而中间体更多。我们得出的结论是，陷阱陷阱可用于轻松监控两栖动物种群的大小变化，并在较小程度上用于测量两栖动物种群的生物量，但不能用于估计其队列组成。

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