摘要
根据联合国粮农组织提供的1950-2012年东南大西洋渔获量连续统计数据,结合Fishbase提供的相关渔获物的营养级（TL）,探讨了63年间东南大西洋渔获量平均营养级（MTL）的变化情况,以此来判断东南大西洋渔业资源状况。研究认为,MTL变动大致可分三个阶段：（1）1950-1963年,MTL呈现下降趋势,降低至历史最低点的2.80;（2）1963-1972年,MTL呈现急剧上升趋势,增至第一个高峰值3.49;（3）1972-2012年大部分年份（85.4%）MTL都在3.30-3.50之间波动,其中1996年达到历史最高点的3.60。东南大西洋渔获物Fi B指数总体上呈现先升高后降低的趋势。1950-1963年,Fi B小幅波动增长;1963-1972年,Fi B呈现急剧上升趋势;1972-2012年,Fi B呈现平稳下降趋势。研究认为,东南大西洋海洋生态系统未被破坏,渔业资源处于未充分开发状态,仍然有较好的开发和利用潜力。
The changes on the mean trophic level（ MTL） of catches in the Southeast Atlantic were analyzed based on fishery catches and landings data from Food and Agriculture Organization of the United Nations（ FAO） during 1950- 2012 and trophic level（ TL） of related catches provided by Fishbase,and the state of fishery resources in the Southeast Atlantic was further estimated. It was found that the mean trophic level of catches could be divided into three stages：（ 1） from 1950 to 1963,MTL decreased to the minimum value of2. 80;（ 2） from 1963 to 1972,MTL increased sharply to the one peak value of 3. 49;（ 3） from 1972 to2012,most of MTL（ 85. 4%） fluctuated between 3. 30 and 3. 50,and the maximum value 3. 6 appeared in1996. The Fi B index first increased and then decreased in overall. From 1950 to 1963,the Fi B index increased gradually and then increased sharply from 1963 to 1912,and finally declined gradually from 1912 to2012. It suggested that fisheries in the Southeast Atlantic did not follow the phenomenon of ‘fishing down marine food webs＇. The increase in mean trophic level indicated that the structure and function of the marine ecosystem in the Southeast Atlantic had not been destroyed, and the fishery resources had not been overfished.
出处
《海洋渔业》
CSCD
北大核心
2015年第3期197-207,共11页
Marine Fisheries
基金
国家自然科学基金(NFSC41306127
NSFC41276156)
上海市自然科学基金(13ZR1419700)
上海市教委创新项目(13YZ091)
教育部博士点基金(20133104120001)
大洋渔业可持续开发教育部重点实验室开放基金(S30702)
