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Please use this identifier to cite or link to this item: http://hdl.handle.net/1834/1137

Title: Cyanobacterial occurrence and diversity in seagrass meadows in coastal Tanzania
Authors: Lyimo, T.J.
Hamisi, M.I.
Muruke, M.H.S.
ASFA Terms: Sea grass
Issue Date: 2004
Publisher: WIOMSA
Citation: Western Indian Ocean Journal of Marine Science, 3 (2), p. 113–122
Abstract: We report on the occurrence and diversity of cyanobacteria in intertidal seagrass meadows at Ocean Road and Mjimwema, Dar es Salaam, Tanzania. Nutrients, temperature and salinity were measured as comparative environmental factors. A total of 19 different cyanobacteria taxa were encountered, out of which eight were found exclusively in Mjimwema, four exclusively in Ocean Road and seven were common to both sites. Oscillatoria, Lyngbya and Spirulina were the dominant cyanobacterial genera. Cyanobacterial coverage was higher in Mjimwema (31–100%) than in Ocean Road (0–60%). The levels of nutrients in tidal pool waters at Ocean Road ranged from 0.45–1.03 ìmol NO3 -N/l, 0.19–0.27 ìmol NO2 -N/l and 0.03–0.09 ìmol PO4 -P/l. At Mjimwema the nutrient concentration ranges were 0.14–0.93 ìmol NO3 -N/l, 0.20–0.30 ìmol NO2 -N/l and 0.01-0.07 ìmol PO4 -P/l . The nutrient levels were significantly higher at Ocean Road than at Mjimwema (P = 0.001 for nitrate and P = 0.025 for phosphate). There was no significant difference in nitrite levels between the study sites (P = 0.83). The low cyanobacterial diversity and coverage in Ocean Road is related to the high levels of nutrients and physical disturbance from sewage discharge and the harbour in the area.
URI: http://hdl.handle.net/1834/1137
Related document: http://www.wiomsa.org
ISSN: 0856-860X
Appears in Collections:Western Indian Ocean Journal of Marine Science - Archive

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