Abstract:
:The increased incidence of solar ultraviolet radiation (UV) due to ozone depletion has been affecting both terrestrial and aquatic ecosystems and it may help to explain the enigmatic decline of amphibian populations in specific localities. In this work, influential events concerning the Antarctic ozone hole were identified in a dataset containing 35 years of ozone measurements over southern Brazil. The effects of environmental doses of UVB and UVA radiation were addressed on the morphology and development of Hypsiboas pulchellus tadpole (Anura: Hylidae), as well as on the induction of malformation after the conclusion of metamorphosis. These analyzes were complemented by the detection of micronucleus formation in blood cells. 72 ozone depletion events were identified from 1979 to 2013. Surprisingly, their yearly frequency increased three-fold during the last 17 years. The results clearly show that H. pulchellus tadpole are much more sensitive to UVB than UVA light, which reduces their survival and developmental rates. Additionally, the rates of micronucleus formation by UVB were considerably higher compared to UVA even after the activation of photolyases enzymes by a further photoreactivation treatment. Consequently, a higher occurrence of malformation was observed in UVB-irradiated individuals. These results demonstrate the severe genotoxic impact of UVB radiation on this treefrog species and its importance for further studies aimed to assess the impact of the increased levels of solar UVB radiation on declining species of the Hylidae family.
journal_name
Ecotoxicol Environ Safjournal_title
Ecotoxicology and environmental safetyauthors
Passaglia Schuch A,Dos Santos MB,Mendes Lipinski V,Vaz Peres L,Dos Santos CP,Zanini Cechin S,Jorge Schuch N,Kirsh Pinheiro D,da Silva Loreto ELdoi
10.1016/j.ecoenv.2015.04.029subject
Has Abstractpub_date
2015-08-01 00:00:00pages
190-198eissn
0147-6513issn
1090-2414pii
S0147-6513(15)00186-4journal_volume
118pub_type
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journal_title:Ecotoxicology and environmental safety
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journal_title:Ecotoxicology and environmental safety
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journal_title:Ecotoxicology and environmental safety
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