Your search found 5 records
1 Finlayson, Max; Lowry, J.; Bellio, Maria Grazia; Nou, S.; Pidgeon, R.; Walden, D.; Humphrey, C.; Fox, G. 2006. Biodiversity of the wetlands of the Kakadu Region, northern Australia. Aquatic Sciences, 68:374-399.
Wetlands ; Biodiversity ; Vegetation ; Climate ; Hydrology ; Invertebrates ; Fish ; Amphibians ; Reptiles ; Waterfowl ; Mammals / Australia / Kakadu Region
(Location: IWMI-HQ Call no: IWMI 333.95288 G922 FIN Record No: H039732)
2 Rajakaruna, R. S.; Jayawardena, U. A.; Piyatissa, P. M. J. R.; Navaratne, A.; Amerasinghe, Priyanie. 2007. Trematode infections, biocides and amphibian deformities: evidence from an amphibian hotspot. [Abstract only]. Abstract of a paper presented at a Joint Meeting of Ichthiologists and Herpetologists, St. Louis MO, USA, 2007. 1p.
(Location: IWMI HQ Call no: IWMI 597.8 G000 RAJ Record No: H040820)
3 Rajakaruna, R. S.; Piyatissa, P. M. J. R.; Jayawardena, U. A.; Navaratne, A. N.; Amerasinghe, Priyanie H. 2008. Trematode infection induced malformations in the common hourglass treefrogs. Journal of Zoology, 275:89-95.
(Location: IWMI HQ Call no: e-copy only Record No: H042478)
(0.57 MB)
Reports on malformations in amphibians due to trematode infections prompted this study on an endemic frog species in Sri Lanka. The effect of an infection with a monostome-type cercaria is reported here. Ten days post-hatch, tadpoles (Gosner stage 27) of the common hourglass treefrog Polypedates cruciger (Anura: Ranidae), were exposed to a monostome-type cercaria, in a dose-dependent manner, under laboratory conditions. Malformations, survival and growth of the tadpoles were monitored for four treatments having different doses of cercariae (control=0, low=16, intermediate=32 and high=48). The severity and the number of malformations varied depending on the dose of the infection. A higher percentage (90%) of malformations was observed at higher doses of cercariae. Overall, malformations in the limbs, spine and skin pigmentation were common after parasite exposure. Survival declined with increasing doses of parasite infections, declining to 88% in the high treatment group, although not statistically significant. The growth rates of tadpoles as measured by weight and snout to vent length showed that exposed individuals were significantly smaller and had higher variance in growth compared with that of the controls. Thus, this trematode infection significantly affected the growth and induced severe malformations in P. cruciger, under laboratory conditions. Such malformed tadpoles and adults may face high predation under natural conditions. Here, we present the first empirical evidence of the effect of a trematode infection on the development of malformations, growth and survivorship in an endemic amphibian species in Sri Lanka.
4 Jayawardena, U. A.; Rajakaruna, R. S.; Navaratne, A. N.; Amerasinghe, Priyanie H. 2010. Toxicity of agrochemicals to common hourglass tree frog (Polypedates cruciger) in acute and chronic exposure. International Journal of Agriculture and Biology, 12(5): 641-648.
(Location: IWMI HQ Call no: e-copy only Record No: H043540)
http://www.fspublishers.org/ijab/past-issues/IJABVOL_12_NO_5/1.pdf
https://vlibrary.iwmi.org/pdf/H043540.pdf
https://vlibrary.iwmi.org/pdf/H043540.pdf
(0.15 MB)
Direct effect of four common agricultural pesticides viz., chlorpyrifos, dimethoate, glyphosate and propanil, on the survival, growth and development of malformations in common hourglass tree frog, Polypedates cruciger (Anura: Ranidae) was studied under laboratory conditions in acute and chronic exposure. Acute exposure to high concentrations was carried out to determine the LC50. The 48 h LC50 of the pesticides were within the Pesticide Area Network specified limits, except for propanil. The percentage survival of the tadpoles under chronic exposure to ecologically relevant doses was lower (glyphosate 75%, dimethoate 77.5%, chlorpyrifos 80% & propanil 85%) than the control group (95.5%) and was significantly affected by the concentrations. Exposed tadpoles took more time to metamorphose and were significantly smaller in size than the control tadpoles. They also developed malformations at high frequencies (glyphosate = 69%, dimethoate = 64%, chlorpyrifos = 60%, propanil = 45%). Malformations were mainly kyphosis (hunched back), scoliosis (curvature), skin ulcers and edema. However, severe limb malformations were not observed in the study. Chlorpyrifos had a profound effect even at very low concentrations (0.05 ppm). This study provides the first empirical evidence of a comparative study on the effect of pesticides on an endemic amphibian species in Sri Lanka and underscores the importance of investigation the level of agricultural pesticides in freshwater ecosystems and their effect on non-target organisms.
5 Samarakoon, J.; van Zon, H. (Eds.) 1991. Environmental profile of Muthurajawela and Negombo lagoon. Colombo, Sri Lanka: Greater Colombo Economic Commission (GCEC); Arnhem, Netherlands: Euroconsult. 173p.
Environmental protection ; Water management ; Hydrology ; Climatic data ; Drainage systems ; Swamps ; Natural resources ; Ecosystems ; Vegetation ; Aquatic plants ; Mangroves ; Marshes ; Lagoons ; Mammals ; Birds ; Reptiles ; Amphibians ; Fishes ; Invertebrates ; Geology ; Soils ; Socioeconomic environment ; Sustainable development ; Public health ; Infrastructure ; Industrialization ; Corporate culture ; Urbanization ; Land use ; Agricultural development ; Fisheries ; Aquaculture ; Legal aspects / Sri Lanka / Negombo Lagoon / Muthurajawela
(Location: IWMI HQ Call no: e-copy SF Record No: H047341)
(0.27 MB)
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