Determining the role of anthropogenic nutrients in supporting fisheries off the Mediterranean coast of Egypt: an approach using stable isotopes

确定人为营养物质在支持埃及地中海沿岸渔业中的作用:使用稳定同位素的方法

基本信息

  • 批准号:
    0526332
  • 负责人:
  • 金额:
    $ 25.62万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2005
  • 资助国家:
    美国
  • 起止时间:
    2005-09-01 至 2010-01-31
  • 项目状态:
    已结题

项目摘要

Following closure of the Aswan High Dam in 1965 and the elimination of annual flooding of the Nile basin, the Mediterranean Sea fishery off the Egyptian Coast collapsed. Beginning in the mid-1980's, landings began a dramatic recovery and have now reached levels well above those of the pre-dam fishery. Three major hypotheses have been advanced to explain the apparent increase in secondary production on the Egyptian Coast: replacement of the Nile flood nutrients by anthropogenic sources of nitrogen and phosphorous from agricultural drainage and sewage; replacement of Nile nutrients by a change in the large scale circulation of the Eastern Mediterranean waters; and that the apparent increase in production is actually an expansion of fishing effort and improved data collection and statistics. The principal investigator will track stable nitrogen isotopes from alternate nitrogen sources to the formation of particulate organic matter, fish, and prawns in the large Nile delta lagoons and in fisheries landings from the nearshore Egyptian Shelf waters. Sources include nitrogen derived from land drainage, sewage, Nile water, and Mediterranean Shelf water. Historical changes in inorganic nitrogen over the past century will be examined in sediment cores from delta lagoons and from the near shore shelf. Progress reports will be posted regularly in log form on a website created for middle and secondary public school children. Classroom visits to local Rhode Island schools will emphasize comparing human impacts from sewage, fertilizers, and factories in Narragansett Bay to those in Egypt. With the assistance of colleagues in the National Institute of Oceanography and Fisheries, Egypt, information will be translated into Arabic and published in popular Arabic journals such as Environment & Development Monthly and on heavily visited websites such as Islam Online. Funding for this project is provided by the Office of International Science and Engineering and by the Biological Oceanography Program.
1965年阿斯旺大坝关闭,尼罗河流域每年的洪水消失后,埃及海岸的地中海渔业崩溃。从20世纪80年代中期开始,上岸量开始急剧恢复,现在已经达到远高于大坝前渔业的水平。提出了三个主要假设来解释埃及海岸次级生产力的明显增加:来自农业排水和污水的氮和磷的人为来源替代了尼罗河洪水营养物;东地中海沃茨大尺度环流的变化替代了尼罗河营养物;产量的明显增加实际上是捕捞努力量的扩大以及数据收集和统计的改进。首席研究员将跟踪稳定的氮同位素从替代氮源的形成颗粒有机物,鱼,虾在大尼罗河三角洲泻湖和渔业登陆从近岸埃及大陆架沃茨。 氮的来源包括陆地排水、污水、尼罗河水和地中海陆架水。 在过去的世纪无机氮的历史变化将在三角洲泻湖和近海岸架的沉积物芯检查。进度报告将以日志形式定期张贴在为初中和高中公立学校儿童创建的网站上。对当地罗得岛学校的课堂访问将强调比较纳拉甘塞特湾和埃及的污水、化肥和工厂对人类的影响。在埃及国家海洋学和渔业研究所同事的协助下,将把信息翻译成阿拉伯文,并在《环境发展月刊》等阿拉伯文流行刊物和伊斯兰在线等访问量很大的网站上发表。 该项目的资金由国际科学与工程办公室和生物海洋学计划提供。

项目成果

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Scott Nixon其他文献

The H.T. Odum synthesis essay, a new section in estuaries
  • DOI:
    10.1007/bf02732749
  • 发表时间:
    2005-02-01
  • 期刊:
  • 影响因子:
    2.300
  • 作者:
    Carlos M. Duarte;Scott Nixon;Stephen Threlkeld
  • 通讯作者:
    Stephen Threlkeld

Scott Nixon的其他文献

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{{ truncateString('Scott Nixon', 18)}}的其他基金

WORKSHOP: Comparative Ecology of Freshwater and Coastal Marine Ecosystems, Nairobi, Kenya, Sept. 30 - Oct. 4, 1985
研讨会:淡水和沿海海洋生态系统的比较生态学,肯尼亚内罗毕,1985 年 9 月 30 日至 10 月 4 日
  • 批准号:
    8512517
  • 财政年份:
    1985
  • 资助金额:
    $ 25.62万
  • 项目类别:
    Standard Grant
Denitrification and Nitrous Oxide Production in Nearshore Marine Sediments
近岸海洋沉积物中的反硝化和一氧化二氮的产生
  • 批准号:
    7827124
  • 财政年份:
    1979
  • 资助金额:
    $ 25.62万
  • 项目类别:
    Standard Grant
The Importance of Denitrification and Nitrogen Fixation in Near Shore Marine Environments to the Nitrogen Budget of The Ocean
近岸海洋环境中的反硝化和固氮对海洋氮收支的重要性
  • 批准号:
    7622149
  • 财政年份:
    1976
  • 资助金额:
    $ 25.62万
  • 项目类别:
    Continuing Grant

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希尔卡尼亚森林地区(伊朗北部)沿海拔和纵向梯度的长期植被动态以及第四纪晚期气候、海平面变化、火灾和人为影响的作用
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    2008
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