脂肪酸标志物在海洋生态系统营养关系研究中的应用   总被引：2，自引：0，他引：2       下载免费PDF全文

许强  杨红生 《海洋学报》2011,33(1):1-6

脂肪酸在食物链传递过程中相对保守,可以作为标志物示踪研究海洋生物间的营养关系.脂肪酸标志物属于营养学标志物的一种,是海洋生态系统营养关系研究中很有发展前景的分析方法之一.总结概括了目前国际上应用较广泛的脂肪酸标志及脂肪酸标志体系的建立过程、近年来脂肪酸标志物在海洋生态系统营养关系研究中的应用领域,展望了脂肪酸标志法的应...  相似文献   

罗平生物群     

《云南地质》2014,(4):F0002-F0002

罗平生物群是目前已知多样性最为丰富的中生代海生化石库之一,代表二叠纪末生物大绝灭后早三叠世海洋生态系统的全面复苏。  相似文献   

珊瑚礁白化与生态平衡     

杨欣冉  孟沛柔  张慧 《地球》2022,(1):50-55

珊瑚礁是全球最大的生态系统之一,它一方面维持自身动态平衡,一方面调节海洋环境和保护海岸环境。通过生物作用维护二氧化碳(CO²)和钙(Ca)的收支平衡,同时也调节海洋种群食物链的平衡。海洋中的珊瑚礁生态系统有着媲美陆地热带雨林的生物多样性,对维持海洋生态系统的平衡起到至关重要的作用。  相似文献   

消失的“顶级捕食者”     

《海洋世界》2008,(7):8-8

地中海是47种鲨鱼的栖息地。然而，最近的一项研究报告显示，在过去的200年中．地中海的部分鲨鱼种群已被完全摧毁；其中的5种鲨鱼的种群数甚至下降了97％。这项研究报告的第一作者，加拿大戴尔豪斯大学的弗朗切斯科·费雷蒂表示，顶级捕食者的消失将极大地影响地中海的整个海洋生态系统。更加麻烦的是。研究中发现种群中缺少育龄雌鲨鱼，这意味着即使采用新的保护措施也很难挽回颈势。  相似文献   

外来生物入侵致海洋生态系统危机     

相明 《海洋世界》2010,(12):10-10

<正>海洋外来生物入侵可以理解为非源产地物种由于人为或自然因素从原分布海域引入到新的海域,在当地的自然或半自然海洋生态系统中具备了自我再生能力,并对当地的海洋生态系统造成一定危害的现象。  相似文献   

Spatio-temporal variability of chlorophyll a and its responses to sea surface temperature, winds and height anomaly in the western South China Sea   总被引：2，自引：1，他引：1  

GAO Shan  WANG Hui  LIU Guimei  LI Hai 《海洋学报(英文版)》2013,32(1):48-58

To understand the response of marine ecosystem to environmental factors, the oceanographic (physical and biochemical) data are analyzed to examine the spatio-temporal distributions of chlorophyll a (Chl a) associated with surface temperature, winds and height anomaly for long periods (1997-2008) in the western South China Sea (SCS). The results indicate that seasonal and spatial distributions of Chl a are primarily influenced by monsoon winds and hydrography. A preliminary Empirical Orthogonal Function (EOF) analysis of remotely sensed data is used to assess basic characteristics of the response process of Chl a to physical changes, which reveals interannual variability of anomalous low Chl a values corresponding to strong El Ni o (1997-1998), high values corresponding to strong La Ni a (1999-2000), low Chl a corresponding to moderate El Ni o (2001-2003), upward Chl a after warm event in 2005 off the east coast of Vietnam. The variability of Chl a in nearshore and the Mekong River Estuary (MER) waters also suggests its response to these warm or cold processes. Considering the evidence for covariabilities between Chl a and sea surface temperature, winds, height anomaly (upwelling or downwelling), cold waters input and strong winds mixing may play important roles in the spatial and temporal variability of high Chl a. Such research activities could be very important to gain a mechanistic understanding of ecosystem responses to the climate change in the SCS.  相似文献   

典型海洋生态系统生态修复成效评估研究进展与展望     

吴霖  欧阳玉蓉  吴耀建  蔡灵  戴娟娟 《海洋通报》2021,40(6):601-608,682

近年来,海洋生态系统生态修复成效评估研究日益受到关注.本文梳理了国内外在红树林、珊瑚礁、海草床、盐沼湿地等四类典型海洋生态系统生态修复成效评估指标和评估方法方面的研究进展.结果 表明,典型海洋生态系统在进行生态修复成效评估时,基于修复目标和修复方法,评估指标选取虽各有侧重,但主要包括生物和生境状况两个方面.多数生态修复项目的 监测、评估都是在短期内进行的,缺乏长期、连续性监测,社会和经济相关指标的研究还相对较为缺乏.成效评估方法目前没有比较清晰、全面的分类.实际应用的评估方法较为单一,对海洋生态系统服务价值揭示不够全面.建议未来应立足生态系统过程,加强各典型海洋生态系统生态修复中长期成效评估,开展基于生态修复方式的成效评估,以及社会经济文化效益评估等方面的研究.本文通过对成效评估指标和方法的梳理,以期更好地为典型海洋生态系统生态修复成效评估的理论和实践研究提供参考.  相似文献   

海洋生态系统管理:概念、政策与面临的问题          下载免费PDF全文

王晓静 《海洋开发与管理》2014,31(7):30-34

海洋生态系统管理是一种新型的海洋管理模式,它不同于传统的单一部门管理,以海洋生态系统的整体恢复作为调控和管理的目标,综合考虑影响海洋生态系统的一切因素,能够更有效地解决目前海洋环境和海洋资源所面临的诸多问题。该管理模式代表了现代海洋管理的发展方向,其理念在一系列重要的国际性和地区性法规以及国家法律中得以体现。文章分析了海洋生态系统管理的含义、政策及实施,并且讨论了在其实施的过程中所面临的问题。  相似文献   

Nutrient and eutrophication characteristics of the Dongshan Bay,South China   总被引：1，自引：0，他引：1  

陈宝红  暨卫东  周开文  贺青  傅婷婷 《中国海洋湖沼学报》2014,32(4):886-898

We recorded NO 3-N, NO 2-N, NH 4-N, PO 4-P, SiO 3-Si, salinity, and temperature data at 10 stations in the Dongshan Bay in May, June, July, August, October, and November 2008, analyzing nutrient and eutrophication characteristics. The mean concentration of dissolved inorganic nitrogen(DIN) was 0.30–0.40 mg/dm 3; generally, NO 3-N was the main form in most areas. The mean concentrations of PO 4-P and SiO 3-Si were 0.040–0.060 mg/dm 3 and 1.00–1.50 mg/dm 3, respectively. We proved that the majority of the SiO 3-Si in the Dongshan Bay came from the Zhangjiang River, with some coming from the Bachimen Strait. DIN originated from both the Zhangjiang River and the Bachimen Strait. Most PO 4-P originated from the Bachimen Strait, and some came from the Zhangjiang River. We found that P was an overall limiting factor to the phytoplankton community in most of the Dongshan Bay, and that Si and N were in surplus. However, near the Bachimen Strait Si became a limiting factor, especially for diatoms, while P and N were in comparative surplus. We used a potential eutrophication assessment method to analyze eutrophication, and showed that the most serious eutrophication occurred near the Zhangjiang River estuary and near the Bachimen Strait. In 2008, DIN levels were four times higher than that in 1988; PO 4-P levels were threefold higher, while SiO 3-Si was approximately double. Dissolved nutrients increased between 1988 and 2008. DIN increased at the greatest rate comparing to PO 4-P and SiO 3-Si, thus the N/P and N/Si mol ratios increased. Further studies on the effects of high DIN concentrations on the phytoplankton communities and marine ecosystems of the Dongshan Bay are needed.  相似文献   

“海洋之肾”面临枯竭危机     

刘树江 《地球》2013,(4):39-43

正湿地是分布于陆生生态系统和水生生态系统之间具有独特水文、土壤、植被与生物特征的生态系统,湿地在调节气候、涵养水源、蓄洪防旱、控制土壤侵蚀、促淤造陆、净化环境、维持生物多样性和生态平衡等方面均具有十分重要的作用。湿地具有多种类型,按照地貌类型和湿地形成过程  相似文献