Document Detail


Assessment of the risk of solar ultraviolet radiation to amphibians. II. In situ characterzation of exposure in amphibian habitats.
MedLine Citation:
PMID:  12144259     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Ultraviolet B (UVB) radiation has been hypothesized as a potential cause of amphibian population declines and increased incidence of malformations. Realistic studies documenting UV irradiance or dose have rarely been conducted in wetlands used by amphibians. Our data indicates that 99% of UVB is attenuated in the top 5-20 cm of wetlands in our study region (northern Minnesota and Wisconsin). Furthermore, vegetation and other habitat features have substantial impacts on local UVB irradiance levels and dose. UVB attenuation in the water columns of our wetlands is controlled by the specific absorption of dissolved organic carbon (DOC), and consequently, UVB attenuation is best predicted by simple laboratory absorbance measurements such as bulk water color (absorbance at 440 nm) or wavelength-specific absorbance coefficients. Seasonal data indicate thatthe UVB absorption by early and mid-season DOC is higher than that of late summer and fall DOC, suggesting increased protection from UVB during the potentially sensitive stages of amphibian development. In addition to dissolved components, our model indicates that suspended solids play a small role in UVB attenuation in our wetlands but apparently only at high concentrations. Models predicting UV attenuation in wetlands should be used cautiously and should consider temporal variability, given the volatility and dynamic nature of water column characteristics in wetlands. Organism behavior is a critical but poorly understood phenomenon that must be addressed for development of an accurate UV exposure risk model for amphibians.
Authors:
Gregory S Peterson; Lucinda B Johnson; Richard P Axler; Stephen A Diamond
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Environmental science & technology     Volume:  36     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2002 Jul 
Date Detail:
Created Date:  2002-07-29     Completed Date:  2003-01-22     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2859-65     Citation Subset:  IM    
Affiliation:
U.S. Environmental Protection Agency, National Health and Environmental Effects Research Laboratory, Mid-Continent Ecology Division, Duluth, Minnesota 55804, USA.
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MeSH Terms
Descriptor/Qualifier:
Absorption
Animals
Behavior, Animal*
Environmental Exposure*
Environmental Monitoring
Hindlimb / abnormalities*
Larva / growth & development
Models, Theoretical*
Rana pipiens / abnormalities*
Risk Assessment
Ultraviolet Rays / adverse effects*
Comments/Corrections
Comment In:
Environ Sci Technol. 2002 Jul 1;36(13):264A   [PMID:  12144240 ]
Erratum In:
Environ Sci Technol. 2003 Nov 1;37(21):5080

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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