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Primary production and respiration of the phyto plankton in the blue nile and white nile at khartoum sudan


, : Primary production and respiration of the phyto plankton in the blue nile and white nile at khartoum sudan. Hydrobiologia 110: 57-60

Phytoplankton production and respiration in the Blue Nile and White Nile at Khartoum were measured during the period Nov. 1969-Jan. 1971 using the light and dark bottle technique. Maximum rates of production coincided with periods of maximum phytoplankton densities. In the Blue Nile gross production varied between 0.00 gCm-3 d[day]-1 during the flood season and 2.19 gCm-3d-1 (0.49 mgO2l-1h-1) during Nov. 1969. In the White Nile the range was from 0.41 gCm-3d-1 (0.09 mgO2l-1h-1) in May to 3.74 gCm-3d-1 (0.83 mgO2l-1h-1) in Nov. The maximum rates of respiration in the Blue Nile and White Nile were 0.10 and 0.63 mgO2l-1h-1, respectively. The ratios net:gross production were generally higher in the White Nile than in the Blue Nile.

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