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Key prey indicates high resilience on marine soft bottom habitats.
Marine Environmental Research ( IF 3.3 ) Pub Date : 2020-04-03 , DOI: 10.1016/j.marenvres.2020.104963
Agnaldo Silva Martins 1 , Manuel Haimovici 2
Affiliation  

The key prey was determined based on the diet and spatial patterns of the Nektonic community in southern Brazil. The proposed tool to discriminate key prey was based on simple probabilistic methods and analytical procedures that integrate freely available software on the web. To avoid using arbitrary criteria in key prey determination it was used an indicator based on an adapted outlier analysis including a run of principal component analysis (PCA) and then the choice of prey that fall out of the 99% concentration ellipse. The results showed three key prey identified at species level: the shrimp Artemesia longinaris in the coastal habitats and euphausid Euphausia similis and anchovy Engraulis anchoita in the continental shelf habitats (warm and cold). The analysis of the diets of the indicator species of three necktonic assemblages showed that all of them had both pelagic and detritus as primary sources of energy. However, in shallow coastal waters prevailed access to benthic food web key prey. In deeper areas, the Warm shelf assemblage accessed more evenly the epifauna, infauna and the pelagic compartments, while the Cold shelf assemblage was more dependent on planktonic production and had a prevalence of pelagic key prey. Is demonstrated the importance of the identification of key prey, since it may indicate greater or lesser stability of predator populations depending on whether they come from compartments with more or less dynamic primary production processes, including climate-related changes that may affect the predator prey interactions. This study confirmed the prediction that demersal nekton has high disturbance recovery capacity, which may mask for decades the growing impact of fishing.



中文翻译:

关键猎物显示出对海洋软底生境的高适应力。

根据巴西南部Nektonic社区的饮食和空间格局确定了主要猎物。拟议的区分主要猎物的工具是基于简单的概率方法和分析程序,这些方法集成了网络上免费提供的软件。为了避免在确定关键猎物时使用任意标准,我们使用了一种指标,该指标基于经过调整的异常值分析,包括一次主成分分析(PCA),然后选择浓度范围为99%椭圆的猎物。结果表明:在物种水平上确定了三个主要的猎物:虾蒿longinaris沿海栖息地和euphausid磷虾线虫和鳀鱼鳀anchoita在大陆架栖息地(温暖和寒冷)。对三种颈项组合指示性食物的饮食分析表明,它们均以浮游和碎屑为主要能量来源。然而,在沿海浅水区,盛行底栖食物网的主要猎物。在更深的地区,暖架组合更均匀地进入表层动物,动物群和中上层隔室,而冷架组合更依赖浮游生物的生产,并且普遍存在中上层主要猎物。已证明识别关键猎物的重要性,因为它可能表明捕食者种群的稳定性或高或低,这取决于它们是否来自具有或多或少动态初级生产过程的区域,包括可能影响捕食者与猎物相互作用的气候相关变化。

更新日期:2020-04-03
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