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首页> 外文期刊>Marine ecology progress series >Exploring spatio-temporal changes in the demersal and benthopelagic assemblages of the northwestern Ionian Sea (central Mediterranean Sea)
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Exploring spatio-temporal changes in the demersal and benthopelagic assemblages of the northwestern Ionian Sea (central Mediterranean Sea)

机译：探索西北爱奥尼亚海（地中海中部）的海底和海底上层组合的时空变化

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摘要

An exploration of the structure of demersal and benthopelagic assemblages in the north-western Ionian Sea was carried out by means of a set of statistical analyses. Self-organising map (SOM) and clustering methods applied to 183 taxa and their biomass (kg km(-2)) provided the classification of 1288 experimental hauls exploring the bathymetric range 10-800 m from 1995 to 2012. Six clusters were identified according to their similarities in species abundances (biomass), confirming the depth gradient as the main structuring agent. In order to identify key representative species in each cluster, the taxa were ranked by means of an indicator value index (IndVal) and the contribution of species to beta diversity (BD). Furthermore, the clusters were described by means of environmental and fishing characteristics. Particular habitat type, distance to canyon and fishing effort segregated the assemblages on the coastal shelf and slope. Temporal differences were detected in 2 bathyal groups, which were most likely affected by the 1990s environmental change in the deepwater circulation known as the Eastern Mediterranean Transient. The overall total BD in the study area was calculated as 0.79, with a temporal decrease observed at a rate of 0.7% yr(-1). The approaches used are useful to identify and characterize the species aggregations inside complex faunal assemblages, without a priori assumptions about data distribution. These results can be a starting point for defining functional groups for Mediterranean food web modelling approaches, as well as for identifying indicator species to assess the environmental status in the context of the Marine Strategy Framework Directive.
机译：通过一组统计分析，对爱奥尼亚海西北部的海底和上层上层组合的结构进行了探索。自组织图（SOM）和聚类方法应用于183个分类单元及其生物量（kg km（-2）），提供了1288个实验拖运的分类，探索了从1995年到2012年测深范围的10-800 m。由于它们在物种丰度（生物质）方面的相似性，证实了深度梯度是主要的构造剂。为了确定每个集群中的关键代表性物种，通过指标值指数（IndVal）和物种对β多样性的贡献（BD）对分类单元进行排名。此外，通过环境和捕鱼特征描述了这些星团。特定的栖息地类型，到峡谷的距离和捕捞努力将沿海架子和斜坡上的物种隔离开来。在两个深水组中发现了时间差异，这很可能是受1990年代深水循环中称为东地中海过渡带的环境变化的影响。计算得出研究区域的总BD值为0.79，随时间的推移，以0.7％yr（-1）的速度下降。所使用的方法可用于识别和表征复杂动物群内部的物种聚集，而无需事先假设数据分布。这些结果可以为定义地中海食物网建模方法的功能组以及确定指标物种以根据《海洋战略框架指令》评估环境状况提供一个起点。

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