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Nitrogenase activity in the papyrus swamps of Lake Naivasha, Kenya
Mwaura, F.B.; Widdowson, D. (1992). Nitrogenase activity in the papyrus swamps of Lake Naivasha, Kenya, in: Mavuti, K.M. et al. (Ed.) (1993). Recent Advances in Hydrobiology and Fisheries in Eastern Africa: Proceedings of the 1st Symposium of Hydrobiological Society of East Africa, on State of Knowledge and Recent Research Advances in Freshwater and Marine Biology in Eastern Africa, held in Nairobi, Kenya, 13-16 December 1988. pp. 23-30
In: Mavuti, K.M.; Jaccarini, V.; Martens, E.E. (Ed.) (1993). Recent Advances in Hydrobiology and Fisheries in Eastern Africa: Proceedings of the 1st Symposium of Hydrobiological Society of East Africa, on State of Knowledge and Recent Research Advances in Freshwater and Marine Biology in Eastern Africa, held in Nairobi, Kenya, 13-16 December 1988. Kluwer Academic: Dordrecht. IX, 110 pp., more
In: Hydrobiologia. Springer: The Hague. ISSN 0018-8158, more
Peer reviewed article  

Available in  Authors 
Document type: Conference paper

Keyword
    Fresh water

Authors  Top 
  • Mwaura, F.B.
  • Widdowson, D.

Abstract
    Nitrogenase activity (acetylene reduction activity) was found to occur universally in the Cyperus papyrus swamp in Lake Naivasha. Low rates of acetylene reduction activity (0.9-104.9 mnol C2H4 g d.wt. roots-1 h-1) were associated with excised roots of C. papyrus but higher rates of activity (89.0- 280.4 mnol C2H4 g d.wt. roots-1 h-1) were associated with intact root systems of the plant. It was estimated that nitrogen fixation associated with young roots alone could supply about 26% of the nitrogen requirernents of growing papyrus plants. Acetylene reduction activity in the lake bottom sediments was generally low and associated with adjacent papyrus stands. Plate counts of putative aerobic and facultatively anaerobic N2-fixing bacteria associated with papyrus roots showed the presence of high numbers of diazotrophs (5.4 x 106 CFU g d.wt. roots-1). Fewer numbers of N2-fixing bacteria were detected in the sediments (1.9 X 10³-3.2 X 104 CFU g d.wt. sediment-1).

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