The influence of physical-chemical variables on the spatial and seasonal variation of Chlorophyll-a in coastal waters of Unguja, Zanzibar, Tanzania
| dc.creator | Peter, Nyamisi | |
| dc.creator | Semba, Masumbuko | |
| dc.creator | Lugomela, Charles | |
| dc.creator | Kyewalyanga, Margareth S. | |
| dc.date | 2021-05-24T14:20:05Z | |
| dc.date | 2021-05-24T14:20:05Z | |
| dc.date | 2018-12-11 | |
| dc.date.accessioned | 2022-10-25T09:24:51Z | |
| dc.date.available | 2022-10-25T09:24:51Z | |
| dc.description | This research article published by African Journals Online | |
| dc.description | Chlorophyll-a (Chl-a) concentrations were measured at four sites around Unguja, Zanzibar during the northeast (NE) and southeast (SE) monsoon seasons. Data for Chl-a, nitrate, phosphate, ammonia, dissolved oxygen, sea sur-face temperature, pH and salinity were collected once a month from March 2008 to March 2009. The SE monsoon had insignificantly higher Chl-a compared to the NE monsoon season when Chl-a for Bawe, Chumbe, Pongwe and Mnemba were combined (W = 234, p = 0.93). The drivers of high Chl-a during the SE monsoon were ammonia and nitrate. Results from individual sites showed that Pongwe and Mnemba had higher median Chl-a during the SE- than the NE monsoon season. Temperature, dissolved oxygen and ammonia were the major factors that influenced high Chl-a at these sites. In contrast, Chumbe and Bawe had higher median Chl-a during the NE- than the SE mon-soon season. The major factors influencing high Chl-a in the NE at Chumbe and Bawe were high levels of nutrients, mainly from sewage effluent and various human activities around the coast in Zanzibar town. The interaction of Chl-a between monsoon seasons (NE and SE) and sites (Bawe, Chumbe, Pongwe and Mnemba) was insignificant (F(1,3) = 1.3144, p = 0.2949). The principal component analysis revealed that different physical and chemical environmental variables affect Chl-a concentration over time and location | |
| dc.format | application/pdf | |
| dc.identifier | https://doi.org/10.4314/wiojms.v17i2.3 | |
| dc.identifier | https://dspace.nm-aist.ac.tz/handle/20.500.12479/1188 | |
| dc.identifier.uri | http://hdl.handle.net/123456789/95827 | |
| dc.language | en | |
| dc.publisher | African Journals Online | |
| dc.subject | Chlorophyll-a | |
| dc.subject | Monsoon seasons | |
| dc.subject | Physical-chemical variables | |
| dc.title | The influence of physical-chemical variables on the spatial and seasonal variation of Chlorophyll-a in coastal waters of Unguja, Zanzibar, Tanzania | |
| dc.type | Article |