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Productivity and biomass assessments for supporting management of the Agulhas Current and Somali Current Large Marine Ecosystems

机译：生产力和生物量评估，以支持Agulhas Current和Somali Current大型海洋生态系统的管理

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The Canary Current Large Marine Ecosystem (CCLME) is a Global Environmental Facility(GEF) Project, situated in the Atlantic Ocean on the North West coast of Africa. It has seven countries with a population estimate of 64.5 million and a coastline of more than 5400 km with a sea area of 2 million km2 within their Exclusive Economic Zones (EEZ). This area is one of the richest productive marine ecosystems in the world and its coastal and oceanic waters are rich in biodiversity and hosts approximately 12,500 species dominated by crustaceans, mollusks and fish. The total annual value of the ecosystem services provided by the CCLME is estimated to be around U$11.7 billion. The interaction between the CCLME and seasonal change in the ocean-atmospheric dynamics drives the productivity which has a mean annual value for chlorophyll of 1.31 mg chl a/ m~3 and 372 gCm~2yr~(-1) for primary productivity, based on SeaWiFS satellite data. This productivity supports abundant fish stocks with catches up to 3 million tonnes per annum being landed from the region. Fish population are dominated by the small pelagics especially sardine(Sardina pilchardus), sardinellas (Sardinella sp.) and horse mackerels (Trachurus sp). Satellite derived measurements from 1997 to 2012 reveal a downward trend in primary production and this decline is accompanied by a net warming of the system and a decrease in the upwelling. The declining trends and variability in biomass of some main target commercial fish species observed during these last year was accompanied by significant fishing pressure together with fluctuations in environmental factors which may have been a key drivers of change. Future studies on the ocean dynamics of the CCLME system, its impact on resources, environmental interactions and climate change will have to be closely monitored to ensure effective transboundary management.
机译：加那利当前大型海洋生态系统（CCLME）是一个全球环境基金（GEF）项目，位于非洲西北海岸的大西洋中。它有七个国家，其人口估计为6450万，其专属经济区（EEZ）内的海岸线超过5400公里，海域面积为200万平方公里。该地区是世界上生产力最高的海洋生态系统之一，其沿海和海洋水域具有丰富的生物多样性，并拥有约12500种以甲壳类，软体动物和鱼类为主的物种。 CCLME提供的生态系统服务的年总价值估计约为117亿美元。 CCLME和海洋-大气动力学的季节性变化之间的相互作用驱动生产力，基于初级生产力，叶绿素的年平均值为1.31 mg chl a / m〜3，而372 gCm〜2yr〜（-1）为基础。 SeaWiFS卫星数据。这种生产力支持了该地区丰富的鱼类资源，每年捕获量达300万吨。鱼类种群以小中上层鱼类为主，特别是沙丁鱼（Sardina pilchardus），沙丁鱼（Sardinella sp。）和鲭鱼（Trachurus sp）。从1997年到2012年的卫星测量结果显示，初级生产呈下降趋势，而这种下降伴随着系统的净变暖和上升流的减少。去年观察到的一些主要目标商业鱼类的生物量下降趋势和生物多样性的变化，伴随着巨大的捕捞压力以及环境因素的波动，这可能是变化的主要驱动力。必须密切监测有关CCLME系统海洋动力学，其对资源，环境相互作用和气候变化的未来研究，以确保有效的跨界管理。

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