Phycocyanin as a proxy for algal blooms in surface waters: case study of Ukerewe Island, Tanzania

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dc.contributor.author Mchau, Geofrey J.
dc.contributor.author Makule, Edna E.
dc.contributor.author Machunda, Revocatus L.
dc.contributor.author Gong, Yun Yun
dc.contributor.author Kimanya, Martin
dc.date.accessioned 2020-07-22T10:08:04Z
dc.date.available 2020-07-22T10:08:04Z
dc.date.issued 2019-01-08
dc.identifier.uri https://doi.org/10.2166/wpt.2019.005
dc.identifier.uri https://dspace.nm-aist.ac.tz/handle/123456789/855
dc.description This research article published by IWA Publishing, 2019 en_US
dc.description.abstract Knowledge of the parameters that contribute to water body eutrophication is essential for proper monitoring and management of water quality for human consumption. This study assessed water quality parameters in relation to phycocyanin (PC) as a proxy indicator for harmful algal blooms (HABs). Samples were collected from 23 water sources – lakes, wells, springs and boreholes – in selected villages, for six months. Parameters measured included temperature, pH, redox potential, dissolved oxygen, electrical conductivity, total dissolved solids, nitrate nitrogen, nitrite nitrogen, phosphorus, reactive phosphate and total chlorophyll, which were related to (PC) occurrence. The PC concentration detected in Lake Victoria ranged from 5 to 58.4 μg/l above the WHO alert level and exceeded that in other water sources by almost 30 μg/l (P < 0.001). Univariate relationship between water quality parameters and PC indicates association with temperature, redox potential, total chlorophyll, nitrate nitrogen, nitrite nitrogen, phosphate and reactive phosphorus (P < 0.001). The multivariate model indicates that redox potential, nitrate nitrogen and phosphorus are significant statistically (P < 0.05). A predictive model indicates that nitrate nitrogen and reactive phosphorus contribute significantly to PC occurrence whereby unit (1 mg/l) increases in these parameters increase PC by 9.55 and 4.38 μg/l (P < 0.05) respectively. This study demonstrates that water quality parameters can be used to predict increases in PC and hence as a proxy for HABs. It remains important to be able to classify algal blooms, to understand which species are present and their potential cyanotoxin production. en_US
dc.language.iso en en_US
dc.publisher IWA Publishing en_US
dc.subject Cyanobacteria en_US
dc.subject Phycocyanin en_US
dc.subject Water quality en_US
dc.title Phycocyanin as a proxy for algal blooms in surface waters: case study of Ukerewe Island, Tanzania en_US
dc.type Article en_US

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