Cyanobacterial occurrence and diversity in seagrass meadows in coastal Tanzania
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.
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Format: | Journal Contribution biblioteca |
Language: | English |
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WIOMSA
2004
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Subjects: | Nutrients, Salinity, Temperature, Sea grass, Bacteria, |
Online Access: | http://hdl.handle.net/1834/1137 |
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dig-aquadocs-1834-11372021-05-19T06:13:59Z Cyanobacterial occurrence and diversity in seagrass meadows in coastal Tanzania Lyimo, T.J. Hamisi, M.I. Muruke, M.H.S. Nutrients Salinity Temperature Sea grass Salinity Temperature Bacteria 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. Published Oscillatoria; Lyngbya; Spirulina; cyanobacteria 2006-02-08T09:48:26Z 2006-02-08T09:48:26Z 2004 Journal Contribution Non-Refereed Article Western Indian Ocean Journal of Marine Science, 3 (2), p. 113–122 0856-860X http://hdl.handle.net/1834/1137 en http://www.wiomsa.org 123320 bytes application/pdf Dar es Salaam, Tanzania WIOMSA |
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Nutrients Salinity Temperature Sea grass Salinity Temperature Bacteria Nutrients Salinity Temperature Sea grass Salinity Temperature Bacteria |
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Nutrients Salinity Temperature Sea grass Salinity Temperature Bacteria Nutrients Salinity Temperature Sea grass Salinity Temperature Bacteria Lyimo, T.J. Hamisi, M.I. Muruke, M.H.S. Cyanobacterial occurrence and diversity in seagrass meadows in coastal Tanzania |
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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. |
format |
Journal Contribution |
topic_facet |
Nutrients Salinity Temperature Sea grass Salinity Temperature Bacteria |
author |
Lyimo, T.J. Hamisi, M.I. Muruke, M.H.S. |
author_facet |
Lyimo, T.J. Hamisi, M.I. Muruke, M.H.S. |
author_sort |
Lyimo, T.J. |
title |
Cyanobacterial occurrence and diversity in seagrass meadows in coastal Tanzania |
title_short |
Cyanobacterial occurrence and diversity in seagrass meadows in coastal Tanzania |
title_full |
Cyanobacterial occurrence and diversity in seagrass meadows in coastal Tanzania |
title_fullStr |
Cyanobacterial occurrence and diversity in seagrass meadows in coastal Tanzania |
title_full_unstemmed |
Cyanobacterial occurrence and diversity in seagrass meadows in coastal Tanzania |
title_sort |
cyanobacterial occurrence and diversity in seagrass meadows in coastal tanzania |
publisher |
WIOMSA |
publishDate |
2004 |
url |
http://hdl.handle.net/1834/1137 |
work_keys_str_mv |
AT lyimotj cyanobacterialoccurrenceanddiversityinseagrassmeadowsincoastaltanzania AT hamisimi cyanobacterialoccurrenceanddiversityinseagrassmeadowsincoastaltanzania AT murukemhs cyanobacterialoccurrenceanddiversityinseagrassmeadowsincoastaltanzania |
_version_ |
1756074944541753344 |