...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Aquatic Living Resources >Point, alpha and beta diversity of carnivorous fish along a depth gradient
【24h】

Point, alpha and beta diversity of carnivorous fish along a depth gradient

机译：食肉鱼沿深度梯度的点，α和β多样性

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 catch from bottom longline stations sampled from a series of research cruises around Lanzarote and Fuerteventura (Canary Islands, NE Atlantic) was analysed in terms of fish distribution, density and diversity. The distribution of the number of species and individuals caught per station appeared to fit well the Poisson and Exponential distribution function, respectively. In particular, the parameter of the Poisson's distribution appeared to provide an index of the point (at station scale) diversity, and its confidence interval, allowing for statistical comparisons. The relationships between point diversity, the alpha diversity (in the depth strata) and the beta diversity (along the depth gradient) were investigated. Around the islands, the density and the point diversity of the predator fish declined with depth down to about 800 m and then increased in the deeper stratum. The alpha diversity was the lowest in the deeper stratum but the taxonomic distinctness was similar to that of shallower strata. The beta diversity showed some faunal breaks along the depth gradient. The carnivorous fish fauna can be understood as comprised of three major assemblages: shelf, upper slope and mid-slope that are different both in terms of species composition and point, alpha and beta diversities. The relevance of this simple method for ecological studies of fish assemblage in the context of non-trawlable grounds is discussed, in particular for the slope and other areas of established or developing deep-water fisheries.
机译：从围绕鱼类的分布，密度和多样性的兰萨罗特岛和富埃特文图拉岛（加那利群岛，东北大西洋）进行的一系列研究航行中取样的底延绳钓站的渔获量进行了分析。每个站捕获的物种和个体的数量分布似乎分别与泊松分布和指数分布函数拟合得很好。特别是，泊松分布的参数似乎提供了点（在站点尺度上）多样性及其置信区间的索引，从而可以进行统计比较。研究了点分集，α分集（在深度层次中）和β分集（沿深度梯度）之间的关系。在岛屿周围，捕食性鱼类的密度和点多样性随着深度下降至约800 m而下降，然后在更深的地层中增加。 α多样性在较深层中最低，但分类学上的区别与较浅层相似。 β多样性显示沿深度梯度有一些动物区系断裂。食肉鱼类动物区系可以理解为由三个主要组合组成：架子，上坡和中坡，它们在物种组成和点，α和β多样性方面都不同。讨论了这种简单方法在不可拖网的背景下对鱼类种群生态学研究的相关性，特别是对于已建立或正在发展的深水渔业的坡度和其他区域。

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