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Combining indicator trends to assess ongoing changes in exploited fish communities: diagnostic of communities off the coasts of France 总被引：1，自引：1，他引：1
Rochet Marie-Joelle; Trenkel Verena; Bellail Robert; Coppin Franck; Le Pape Olivier; Mahe Jean-Claude; Morin Jocelyne; Poulard Jean-Charles; Schlaich Ivan; Souplet Arnauld; Verin Yves; Bertrand Jacques 《ICES Journal of Marine Science》2005,62(8):1647-1664
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Piet G. J.; Quirijns F. J.; Robinson L.; Greenstreet S. P. R. 《ICES Journal of Marine Science》2007,64(1):110-121
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Response of potential fish community indicators to fishing 总被引：3，自引：3，他引：3
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The two sympatric species of Cape hake, Merluccius capensis and M. paradoxus, have been the main targets of bottom-trawl fisheries off Namibia for several decades. The feeding ecology of these hakes has been studied mainly using stomach content analyses and thus there remain some gaps in our knowledge about food assimilated over the longer term. In this study, we used fatty acid (FA) profiles to characterise the dietary relationships of M. capensis and M. paradoxus. Muscle samples from hake (n=110) and their known prey (n=68) were collected during trawl surveys off Namibia during 2011. Significant differences between the neutral FA profiles of the hake populations were detected in December 2011 but not in January 2011, an indication of temporal variations in diet and resource partitioning. Comparisons of the neutral FAs in hake and the total FAs of potential prey showed no clear trophic connections, with the exception of flying squid Todarodes sagittatus, which had FA profiles very similar to those of M. paradoxus in December 2011. Our results highlight the complex and temporally shifting relationships that exist between hake and the large pool of prey available to them, and between the two hake species that overlap in their feeding habits and distribution within the highly productive Benguela Current region. 相似文献
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Indicators as a means of communicating knowledge 总被引：3，自引：1，他引：3
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This paper is an introduction to the special issue on a role of participation in dealing with the interactions between environment and fisheries. In this introduction, we explore the recent discussion on the ecosystem-based approach to fisheries management (EBAFM) and extract important points for implementation of EBAFM from the social science literature on participation and participatory processes in environmental management. The introduction finishes by describing the analytical framework for studying participatory processes. 相似文献
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SP Kirkman L Blamey T Lamont G Bianchi JA Huggett 《African Journal of Marine Science》2016,38(1):7-22
The three countries of the Benguela Current Large Marine Ecosystem (BCLME), namely Angola, Namibia and South Africa, have committed to implementing ecosystem-based management (EBM) including an ecosystem approach to fisheries (EAF) in the region, to put in practice the principles of sustainable development in ocean-related matters. There is also recognition of the need for marine spatial planning (MSP) as a process for informing EBM with regard to the allocation and siting of ocean uses so that ecosystem health is ensured and trade-offs between ecosystem services are appropriately dealt with. Marine spatial planning is both an integrated and an area-based process, and this paper produces a spatial characterisation of the BCLME for achieving a common basis for MSP in the region, focusing on the oceanography, biology and fisheries. Recognising spatial variation in physical driving forces, primary and secondary production, trophic structures and species richness, four different subsystems are characterised: (1) north of the Angola–Benguela Front, (2) from the Angola–Benguela Front to Lüderitz, (3) from Lüderitz to Cape Agulhas, and (4) from Cape Agulhas to Port Alfred on the south-east coast of South Africa. Research and monitoring requirements of relevance for MSP and EBM in the region are identified, focusing on understanding variability and change, including with regard to the boundary areas identified for the system. To this end, 14 cross-shelf monitoring transects are proposed (including seven that are already being monitored) to estimate fluxes of biota, energy and materials within and between the subsystems. The usefulness of models for understanding ecosystem variability and changes is recognised and the need for fine-scale resolution of both sampling and modelling for adequate MSP as input to EBM for the often-conflicting interests of conserving biodiversity, and managing fisheries, recreation, offshore oil and gas exploration and exploitation, offshore mining and shipping routes, is emphasised. 相似文献
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21世纪以来底拖网渔业的快速发展给脆弱海洋生态系统（VME）带来极大威胁,导致公海深海渔业发展不可持续以及海洋生物多样性降低。为更好地实现养护海洋渔业资源和保护海洋生物多样性的目标,同时为我国在保护VME以及管理公海深海渔业方面提供参考,文章分析八大区域渔业管理组织（RFMO）针对VME保护采取的系列措施及其保护VME的可行性,针对存在的问题提出对策建议,并对我国在RFMO中保护VME进行展望。研究结果表明：《公海深海渔业管理国际准则》在RFMO保护VME的实践中发挥重要的指导作用;RFMO采取的措施限制深海渔业活动,但为保护VME和养护海洋渔业资源提供重要基础和保障;未来RFMO应加强信息共享和技术合作,发展VME分布预测技术,同时在保护海洋生物多样性方面积极开展双边和多边合作;我国应进一步研究和实践基于生态系统的渔业管理方法,平衡保护与开发利用的关系,积极参与国际渔业管理和VME保护并促进合作,加强南极海域海洋保护区综合治理。 相似文献
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本文基于生态系统健康的基本逻辑与科学内涵构建评价指标体系,评价 2008-2021 年中国沿海 11 个省、市和自治区的海洋渔业生态系统健康及各要素层水平,借助传统与空间Kernel密度估计方法分析中国海洋渔业生态系统健康水平的分布动态演进和长期转移趋势.研究发现:在动态演化特征方面,中国海洋渔业生态系统健康水平随时间的推移提升效果显著,其内部各地区海洋渔业生态健康水平的绝对差异呈上升趋势,且极化现象存在加剧趋势.从各要素层分布曲线来看,海洋渔业生态系统活力的下滑制约了海洋渔业生态系统健康水平的提升;海洋渔业生态系统弹性的变化拉动了海洋渔业生态系统健康水平的不断攀升.在长期转移趋势方面,不考虑空间因素条件下,沿海各地区海洋渔业生态系统健康水平具有较强的稳定性与连续性,在 3 年的时间跨度内实现跨越式等级跃迁的可能性较小,且存在向低水平和高水平\"俱乐部收敛\"的可能性.考虑空间因素条件下,中国海洋渔业生态系统健康水平在空间动态条件下的演进趋势呈现\"断层\"现象.处于 1.2～1.4 临界级与良好级的相邻地区间存在趋同性,而处于 0.6 以下风险级与1.4以上良好级的地区不易与相邻地区发生空间关联作用. 相似文献
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De Lara Michel; Doyen Luc; Guilbaud Therese; Rochet Marie-Joelle 《ICES Journal of Marine Science》2007,64(4):761-767
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《African Journal of Marine Science》2013,35(2):313-320
The bearded goby Sufflogobius bibarbatus has come to replace sardine Sardinops sagax in the diets of many top predators within the marine environment off Namibia, and it is playing a key role within the region's foodweb. Previously published information on the diet of the bearded goby has been derived from small samples and has been contradictory. We investigated the gut contents of over 3 500 specimens of S. bibarbatus from two separate studies. The results indicate that the species has a fairly generalised diet, feeding mostly on benthic and pelagic animals (phytoplankton was rare), in a way that reflects ontogeny, habitat and likely prey availability. Smaller, more pelagic individuals included a substantial number of pelagic organisms in their diet and the proportion of benthic organisms increased with the size of the goby. Given the importance of this species in recycling benthic carbon through the foodweb of the northern Benguela ecosystem, there is a need to describe and quantify the benthic food environment. 相似文献
