PRIMARY PRODUCTION REQUIRED TO SUSTAIN GLOBAL FISHERIES

被引:1318
作者
PAULY, D [1 ]
CHRISTENSEN, V [1 ]
机构
[1] INT CTR LIVING AQUAT RESOURCES MANAGEMENT,MAKATI 0718,PHILIPPINES
关键词
D O I
10.1038/374255a0
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
THE mean of reported annual world fisheries catches for 1988-1991 (94.3 million t) was split into 39 species groups, to which fractional trophic levels, ranging from 1.0 (edible algae) to 4.2 (tunas), were assigned, based on 48 published trophic models, providing a global coverage of six major aquatic ecosystem types. The primary production required to sustain each group of species was then computed based on a mean energy transfer efficiency between trophic levels of 10%, a value that was re-estimated rather than assumed. The primary production required to sustain the reported catches, plus 27 million t of discarded bycatch, amounted to 8.0% of global aquatic primary production, nearly four times the previous estimate. By ecosystem type, the requirements were only 2% for open ocean systems, but ranged from 24 to 35% in fresh water, upwelling and shelf systems, justifying current concerns for sustainability and biodiversity.
引用
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页码:255 / 257
页数:3
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