Combined effects of pesticides and trematode infections on hourglass tree frog Polypedates cruciger

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cg.contributor.affiliationInternational Water Management Instituteen
cg.contributor.crpWater, Land and Ecosystems
cg.identifier.doihttps://doi.org/10.1007/s10393-016-1103-2en
cg.issn1612-9202en
cg.issn1612-9210en
cg.issue1en
cg.journalEcoHealthen
cg.volume13en
dc.contributor.authorJayawardena, U.A.en
dc.contributor.authorRohr, J.R.en
dc.contributor.authorNavaratne, A.N.en
dc.contributor.authorAmerasinghe, Priyanie H.en
dc.contributor.authorRajakaruna, R.S.en
dc.date.accessioned2017-08-30T05:52:41Zen
dc.date.available2017-08-30T05:52:41Zen
dc.identifier.urihttps://hdl.handle.net/10568/83291
dc.titleCombined effects of pesticides and trematode infections on hourglass tree frog Polypedates crucigeren
dcterms.abstractThe impact of widespread and common environmental factors, such as chemical contaminants, on infectious disease risk in amphibians is particularly important because both chemical contaminants and infectious disease have been implicated in worldwide amphibian declines. Here we report on the lone and combined effects of exposure to parasitic cercariae (larval stage) of the digenetic trematode, Acanthostomum burminis, and four commonly used pesticides (insecticides: chlorpyrifos, dimethoate; herbicides: glyphosate, propanil) at ecologically relevant concentrations on the survival, growth, and development of the common hourglass tree frog, Polypedates cruciger Blyth 1852. There was no evidence of any pesticide-induced mortality on cercariae because all the cercariae successfully penetrated each tadpole host regardless of pesticide treatment. In isolation, both cercarial and pesticide exposure significantly decreased frog survival, development, and growth, and increased developmental malformations, such as scoliosis, kyphosis, and also edema and skin ulcers. The combination of cercariae and pesticides generally posed greater risk to frogs than either factor alone by decreasing survival or growth or increasing time to metamorphosis or malformations. The exception was that lone exposure to chlorpyrifos had higher mortality without than with cercariae. Consistent with mathematical models that suggest that stress should increase the impact of generalist parasites, the weight of the evidence from the field and laboratory suggests that ecologically relevant concentrations of agrochemicals generally increase the threat that trematodes pose to amphibians, highlighting the importance of elucidating interactions between anthropogenic activities and infectious disease in taxa of conservation concern.en
dcterms.accessRightsOpen Access
dcterms.available2016-02-24
dcterms.bibliographicCitationJayawardena, U. A.; Rohr, J. R.; Navaratne, A. N.; Amerasinghe, Priyanie H.; Rajakaruna, R. S. 2016. Combined effects of pesticides and trematode infections on hourglass tree frog Polypedates cruciger. Ecohealth, 13(1):111-22. doi: 10.1007/s10393-016-1103-2en
dcterms.extentp. 111-122en
dcterms.issued2016-03
dcterms.languageen
dcterms.licenseCopyrighted; all rights reserved
dcterms.publisherSpringeren
dcterms.subjectpesticidesen
dcterms.subjecttrematode infectionsen
dcterms.subjectfrogsen
dcterms.subjectglyphosateen
dcterms.subjectchlorpyrifosen
dcterms.subjectdimethoateen
dcterms.subjectmalformationsen
dcterms.subjectpropanilen
dcterms.subjectenvironmental factorsen
dcterms.subjectchemical contaminationen
dcterms.subjectdisease preventionen
dcterms.subjectinfectious diseasesen
dcterms.subjectmathematical modelsen
dcterms.subjectecologyen
dcterms.typeJournal Article

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