ESTIMATES OF STANDING STOCK, PRODUCTION AND CONSUMPTION OF MESOZOOPLANKTON AND MACROZOOPLANKTON IN THE BENGUELA ECOSYSTEM

被引:36
作者
HUTCHINGS, L
PILLAR, SC
VERHEYE, HM
机构
[1] Sea Fisheries Research Institute, Rogge Bay, 8012
来源
SOUTH AFRICAN JOURNAL OF MARINE SCIENCE-SUID-AFRIKAANSE TYDSKRIF VIR SEEWETENSKAP | 1991年 / 11卷
关键词
D O I
10.2989/025776191784287628
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
Attempts are made to consolidate current information on estimates of standing stock, production and consumption of meso- and macrozooplankton from the shelf region of the west and south coasts of southern Africa for inclusion in a network analysis of carbon flow in the Benguela system. The meso- and macrozooplankton communities consist chiefly of copepods and euphausiids respectively. Although geographic and seasonal differences in standing stock are reasonably well described for the inner shelf (<200 m), knowledge of production and rate processes affecting standing stock is limited, and extrapolation to the whole shelf area (<500 m) provides only a crude appraisal of the real situation. Despite the uncertainties, direct measurements have improved on estimates previously inferred. It seems likely that grazing by meso- and macrozooplankton plays a minor role in phytoplankton losses in the Benguela system. However, it would appear that predation by macrozooplankton, particularly under swarming conditions, has an appreciable impact on mesozooplankton biomass.
引用
收藏
页码:499 / 512
页数:14
相关论文
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