...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Deep-Sea Research >Surface oceanographic fronts influencing deep-sea biological activity: Using fish stable isotopes as ecological tracers
【24h】

Surface oceanographic fronts influencing deep-sea biological activity: Using fish stable isotopes as ecological tracers

机译：影响深海生物活动的海洋表面前沿：使用鱼类稳定同位素作为生态示踪剂

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

Ecotones can be described as transition zones between neighbouring ecological systems that can be shaped by environmental gradients over a range of space and time scales. In the marine environment, the detection of ecotones is complex given the highly dynamic nature of marine systems and the paucity of empirical data over ocean-basin scales. One approach to overcome these limitations is to use stable isotopes from animal tissues since they can track spatial oceanographic variability across marine systems and, in turn, can be used as ecological tracers. Here, we analysed stable isotopes of deep-sea fishes to assess the presence of ecological discontinuities across the western Mediterranean. We were specifically interested in exploring the connection between deep-sea biological activity and particular oceanographic features (i.e., surface fronts) occurring in the pelagic domain. We collected samples for three different abundant deep-sea species in May 2004 from an experimental oceanographic trawling cruise (MEDITS): the Mictophydae jewel lanternfish Lampanyctus crocodilus and two species of the Gadidae family, the silvery pout Gadiculus argenteus and the blue whiting Micromesistius poutassou. The experimental survey occurred along the Iberian continental shelf and the upper and middle slopes, from the Strait of Gibraltar in the SW to the Cape Creus in the NE. The three deep-sea species were highly abundant throughout the study area and they showed geographic variation in their isotopic values, with decreasing values from north to south disrupted by an important change point around the Vera Gulf. Isotopic latitudinal gradients were explained by pelagic oceanographic conditions along the study area and confirm the existence of an ecotone at the Vera Gulf. This area could be considered as an oceanographic boundary where waters of Atlantic origin meet Mediterranean surface waters forming important frontal structures such as the Almeria-Oran front. In fact, our results relate geographical variation in stable isotopes of deep-sea fishes to regional changes in surface oceanography, highlighting the importance of mesoscale oceanographic features.
机译：过渡带可以描述为相邻生态系统之间的过渡区，过渡区可以通过一定范围的时空范围内的环境梯度来形成。在海洋环境中，鉴于海洋系统的高度动态性以及海洋盆地尺度上的经验数据匮乏，生态过渡带的检测非常复杂。克服这些局限性的一种方法是使用动物组织中的稳定同位素，因为它们可以跟踪整个海洋系统的空间海洋变异性，进而可以用作生态示踪剂。在这里，我们分析了深海鱼类的稳定同位素，以评估整个地中海西部生态不连续性的存在。我们特别感兴趣的是探索深海生物活动与中上层海域发生的特定海洋学特征（即地表锋）之间的联系。我们于2004年5月从一个实验性海洋拖网渔船（MEDITS）上收集了三种不同的丰富深海物种的样品：捕蝇科的宝石灯笼鱼蓝灯鳄和and科的两种，即银out鱼银and和蓝鳕鱼（Micromesistius poutassou）。实验调查沿伊比利亚大陆架和上，中斜坡发生，从西南部的直布罗陀海峡到东北部的克雷乌斯角。这三种深海物种在整个研究区域内都非常丰富，它们的同位素值显示出地理差异，北至南的降低值受到维拉湾周围的重要变化点的干扰。沿研究区域的远洋海洋条件解释了同位素纬度梯度，并证实了维拉湾存在过渡带。该区域可被视为海洋边界，大西洋起源的水与地中海地表水汇合，形成重要的额叶结构，例如阿尔梅里亚-奥兰锋。实际上，我们的结果将深海鱼类稳定同位素的地理变化与地表海洋学的区域变化联系在一起，突出了中尺度海洋学特征的重要性。

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