首页> 外文学位 >Climate, ecology and productivity of Pacific sardine (Sardinops sagax) and hake (Merluccius productus).
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Climate, ecology and productivity of Pacific sardine (Sardinops sagax) and hake (Merluccius productus).

机译:太平洋沙丁鱼(Sardinops sagax)和无须鳕(Merluccius productus)的气候,生态和生产力。

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摘要

The volatility of pelagic fisheries in the California Current (CC) system has long been a challenge for the west coast fishing community. Over the last century, a number of west coast pelagic stocks have undergone large fluctuations in abundance. Faced with sudden collapses in once thriving fisheries (e.g. Pacific sardine in the late 1940s and Pacific hake in the 1990s), resource managers have struggled to understand the causes behind these fluctuations and develop appropriate responses. The overarching objective of this dissertation is to understand how climate, through its effects on pelagic habitat, influences production variability of sardine and hake in the CC system. I show that climate forcing of the CC system results in dynamic distributions of Pacific sardine and hake populations. I find pelagic habitat for these species to be dynamic, its boundaries changing according to time/space changes of the physical oceanographic variables defining it. By considering the oceanography of pelagic habitats I reveal important links between atmosphere-ocean variability and fishery productivity. A more complete understanding of these links could provide us with tools to better manage the fisheries. The focus of this study on two ecologically and commercially important species will allow for a better understanding of ecosystem variability as a whole, an understanding that will be relevant within the context of the current management structure.
机译:长期以来,加州洋流(CC)系统中远洋渔业的动荡一直是西海岸捕捞社区的挑战。在上个世纪,许多西海岸中上层鱼类的丰度发生了很大的波动。面对曾经繁荣的渔业突然崩溃的情况(例如1940年代后期的太平洋沙丁鱼和1990年代的太平洋无鳕),资源管理者一直在努力了解这些波动背后的原因并制定适当的应对措施。本文的首要目标是了解气候如何通过其对中上层生境的影响来影响CC系统中沙丁鱼和无须鳕的生产变异性。我表明CC系统的气候强迫导致太平洋沙丁鱼和无须鳕种群的动态分布。我发现这些物种的中上层生境是动态的,其边界根据定义它的物理海洋变量的时间/空间变化而变化。通过研究远洋生境的海洋学,我揭示了大气-海洋变化与渔业生产力之间的重要联系。对这些链接的更全面的了解可以为我们提供更好地管理渔业的工具。这项研究的重点是两个具有生态和商业意义的物种,这将使人们更好地了解整个生态系统的可变性,这一理解将与当前的管理结构相关。

著录项

  • 作者

    Agostini, Vera N.;

  • 作者单位

    University of Washington.;

  • 授予单位 University of Washington.;
  • 学科 Agriculture Fisheries and Aquaculture.; Biology Zoology.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 181 p.
  • 总页数 181
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 水产、渔业;动物学;
  • 关键词

  • 入库时间 2022-08-17 11:42:41

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