Trophic Status and Spatial Variation of Cyanobacterial Diversity in Lunugamwehera Reservoir, Sri Lanka

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dc.contributor.authorGunawardane, M.H.M.A.S.V.
dc.contributor.authorGamage, S.M.K. Widana
dc.contributor.authorWijesooriya, M.M.
dc.contributor.authorRandima, G.W.A.P.
dc.contributor.authorMasakorala, K.
dc.contributor.authorAtapattu, K.S.S.
dc.contributor.authorSanjaya, K.
dc.date.accessioned2021-01-27T04:44:56Z
dc.date.available2021-01-27T04:44:56Z
dc.date.issued2020
dc.description.abstractLunugamwehera is a large man-made reservoir located in the South Eastern dry zone of Sri Lanka. It is the main source of drinking water, irrigation, and fisheries for more than 5000 families in the area. The occurrence of cyanobacterial blooms or high population densities in water bodies results in various environmental and health issues. Population density and composition of cyanobacteria in a waterbody may vary with the trophic status of water. There is a high potential of contaminating the Lunugamwehera reservoir with mineral nutrients that come from agricultural lands. However, considerable attention has not been paid to study trophic status and cyanobacterial diversity of the Lunugamwehera reservoir. Therefore, our objective was to determine the spatial variation of cyanobacterial diversity in the Lunugamwehera reservoir along with trophic status. Sub-surface water samples collected from 28 sampling sites representing the whole waterbody were microscopically examined to identify cyanobacterial species. Total phosphorous concentration, total chlorophyll-a concentration, and Secchi depth were determined to assess trophic status using Carlson Trophic State Index. Also, water quality parameters were measured using a multiparameter water quality meter. Microscopic analysis revealed the presence of only two cyanobacterial species, Microcystis and Oscillatoria implying less cyanobacterial diversity in the reservoir. Microcystis spp. (~3.257 x 107 cells mL-1 ) dominated all sampling sites with significant difference (p<0.05) in cell densities among sites while Oscillatoria spp. (5 - 10 cells mL-1 ) occurred rarely. Apart from cyanobacteria, Pediastrum spp., Tribonema spp. and Nitzschia spp. (1 - 2 cells mL-1 ) were also identified scarcely. Water quality parameters were approximately similar in all sampling sites except increased turbidity near the inlet. According to the Carlson Trophic State Index (37.70), the water body was ‘slightly oligotrophic’. Therefore, the overall results infer the presence of less cyanobacterial diversity and significant spatial variation in Microcystis spp. as the dominant species in the slightly oligotrophic water of the Lunugamwehera reservoir. Keywords: Carlson trophic state index, Cyanobacteria, Oligotrophic, Spatial variationen_US
dc.identifier.isbn9789550481293
dc.identifier.urihttp://www.erepo.lib.uwu.ac.lk/bitstream/handle/123456789/5662/proceeding_oct_08-130.pdf?sequence=1&isAllowed=y
dc.language.isoenen_US
dc.publisherUva Wellassa University of Sri Lankaen_US
dc.relation.ispartofseries;International Research Conference
dc.subjectAgricultureen_US
dc.subjectAquacultureen_US
dc.subjectAquaculture and Fisheriesen_US
dc.titleTrophic Status and Spatial Variation of Cyanobacterial Diversity in Lunugamwehera Reservoir, Sri Lankaen_US
dc.title.alternativeInternational Research Conference 2020en_US
dc.typeOtheren_US
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