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Browsing Department of Biosystems Technology by Author

Browsing Department of Biosystems Technology by Author "Samayawardhena, L.A."

Now showing items 1-9 of 9

Abundance and distribution of Calanoid copepods(Acartia species & Phyllodiaptomus annae) in Malala lagoon, Bundala National Park- Sri Lanka are partly water quality dependent: effects of sand bar opening on copepod dynamics

Lasanthi, A.H.P.; Chandana, E.P.S.; Ravindra, W.; De S, N.J. Amarasinghe; Peiris, L.D.C.; Samayawardhena, L.A. (2001)

Zooplanktons are considered as an important component of ecosystem functioning and they are abundant in tropicalwaters. Nevertheless more studies are necessary to establish ecosystem-habitat species relationships of ...
Analysis of Socio-Ecological Factors Affecting Bundala National Park

Chandana, E.P.S.; Dewasurendra, R.; Dharmadasa, L.; Priyangani, P.M.C.; De Silva, P.M.C.; Ravindra, R.; Lasanthi, P.; De S, Amarasinghe N. J.; Peiris, L.D.C.; Samayawardhena, L.A. (Sri Lanka Association for the Advancement of Science, Colombo, 2001-11-26)

Bundala National Park (BNP) is the only Ramsar wetland in Sri Lank4 which is reputed for its rich biological diversity of avifauna. The objective of this study was to investigate the socioecological influence of people ...
Chronic Exposure to Paraquat Alters Spermatogenesis and Nuclear DNA Integrity of Epididymal Sperm in Mice

Deepananda, K.H.M.A.; De Silva, W.A.J.P.; Chandana, E.P.S.; Priyanka, S.B.T.; Weerasinghe, S.S.S.; Pitadeniya, G.S.; Peiris, L.D.C.; Samayawardhena, L.A.; Dharmasiri, H.W (The Institute of Biology, Colombo, 2000)

Experimental evidence suggests that unintentional exposure to environmental chemicals may alter reproductive capability of males. The aim of the present study was to investigate effects of low concentrations of Paraquat ...
Damages of Paraquat Exposure to Male Reproductive System and Affect on Spermatogenesis in Rats and Mice

Deepanada, K.H.M.A.; De Silva, W.A.J.P.; Chandana, E.P.S.; Priyanka, S.B.T.; Weerasinghe, S.S.S.; Dharmasiri, H.W.; Samayawardhena, L.A. (Sri Lanka Association for the Advancement of Science, Colombo, 2001-11-26)

Paraquat is one of the most widely used herbicidal chemicals in the world. Even the lowest doses of Paraquat is reported to cause measurable adverse effects on growth, survival and reproduction. Target organ exposure ...
Detailed Morphology, with Reference to Abundance, of Acartia Species in Malala Lagoon in Bundala National Park

Lasanthi, A.H.P.; Chandana, E.P.S.; Siriwardana, V.P.K.; Weerasinghe, I.M.J.; Senaratna, R.J.P.S.; Athukorale, R.; Piyadarshani, R. K.G.; De S, Amarasinghe N.J.; Peiris, L.D.C.; Samayawardhena, L.A. (Institute of Biology, Colombo, 2001)

Freshwater Calanoid copepods are a group of free-living fresh water crustaceans. They are planktonic and limnetic and they occur in habitats varying from freshwater to seawater. We investigated detailed morphology of ...
Effects of Acute Exposure to Paraquat on Sperm Structure and Function in Rats

Samayawardhena, L.A.; Deepananda, K.H.M.A.; De Silva, W.A.J.P.; Chandana, E.P.S.; Priyanka, S.B.T.; Weerasinghe, S.S.S.; Pitadeniya, G.S.; Peiris, L.D.C. (The Institute of Biology, Colombo, 2000)

Paraquat, a broad-spectrum plant killer is widely used in Sri Lanka despite its harmful effects on living organisms. The aim of the present study was to investigate effects of Paraquat on epididymal sperm structure and ...
Factors affecting the avi-faunal distribution in the three lagoons (Malala, Embillakala and Bundala Lewaya) of Bundala National Park (A Ramsar Wetland) in Sri Lanka

Chandana, E.P.S.; Amarasinghe, N. J. de S.; Samayawardhena, L.A. (University of Ruhuna, Matara, Sri Lanka, 2008-09)

Bundala National Park, covering an area of 6216 ha, is located about 250 Km Southeast of Colombo, in the Hambantota District. The shallow brackish water lagoons located within the park - Koholankala (390 ha), Malala (650 ...
An Investigation of the Effects of Low Concentrations of Chlorpyrifos on Epididymal Sperm Mutation in Rats

De Silva, W.A.J.P.; Deepananda, K.H.M.A.; Chandana, E.P.S.; Peiris, L.D.C.; Samayawardhena, L.A. (Sri Lanka Association for the Advancement of Science, Colombo, 2001-11-26)

The present study investigated effects of extremely low concentrations of Chlorpyrifos (Pyrimec) to reproductive structure and function of male rats. First, a group o f animals (4 groups; n=10) were given oral dose of ...
Physico-chemical and biological environment of Malala lagoon at Bundala National park under overwhelming fresh water influence

Chandana, E.P.S.; Ravindra, R.; Lasanthi, P.; De S, Amarasinghe N. J.; Peiris, L.D.C.; Samayawardhena, L.A. (Sri Lanka Association for the Advancement of Science, Colombo, 2001-11-26)

Bundala National Park situated in Southern Sri Lanka is the only Ramsar wetland system in the country. Malala lagoon, the largest water body in Bundala National Park is a very productive ecosystem that is demarcated by ...

Browsing Department of Biosystems Technology by Author "Samayawardhena, L.A."

Browsing Department of Biosystems Technology by Author "Samayawardhena, L.A."

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