SEASONAL CYCLE OF THE PHYTOPLANKTON IN THE COASTAL WATERS OF GHANA

被引:7
作者
ANANG, ER
机构
[1] Fisheries Research Unit, Tema
关键词
phosphate nitrate; phytoplankton; salinity; Seasonal cycle; silicate; temperature;
D O I
10.1007/BF00012560
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
Seasonal changes in the phytoplankton at four depths off Tema, Ghana were investigated between September 1973 and November 1974. The physico-chemical factors show that there are two marine seasons, the season of major upwelling (July-October), characterized by low water temperatures (< 25°C), high salinity (> 35‰) and high nutrient levels, and a non-upwelling period (November-June) when water temperatures are higher and salinity and nutrients are lower. The latter marine season is broken by a small, unpredictable upwelling (December-January). Phytoplankton cell counts are high (> 1000 × 103 cells/1) during the major upwelling period and can be very low (< 2 × 103 cells/1) during the non-upwelling period. Dinoflagellates form the main components of the phytoplankton population during the nonupwelling period and diatoms form the dominant components at other times. There is a close relationship between the physicochemical factors and the phytoplankton population especially during the major upwelling period. For example there is a good correspondence between the peaks in phytoplankton numbers and low levels of nutrients such as silicate, nitrate and phosphate with the reverse taking place at other times. © 1979 Dr. W. Junk b. v. Publishers.
引用
收藏
页码:33 / 46
页数:14
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