| Abstract: | An increase in ultraviolet-B (UV-B) radiation has
been posited to be a potential factor in the decline of
some amphibian population. This hypothesis has
received support from laboratory and field experiments
showing that current levels of UV-B can
cause embryo mortality in some species, but little
research has addressed whether UV-B is influencing
the distribution of amphibian populations. We
compared patterns of amphibian presence to sitespecific
estimates of UV-B dose at 683 ponds and
lakes in Glacier, Olympic, and Sequoiaa??Kings
Canyon National Parks. All three parks are located
in western North America, a region with a concentration
of documented amphibian declines. Sitespecific
daily UV-B dose was estimated using
modeled and field-collected data to incorporate the
effects of elevation, landscape, and water-column
dissolved organic carbon. Of the eight species we
examined (Ambystoma gracile, Ambystoma macrodactylum,
Bufo boreas, Pseudacris regilla, Rana cascadae,
Rana leuteiventris, Rana muscosa, Taricha granulosa),
two species (T. granulosa and A. macrodactylum) had
quadratic relationships with UV-B that could have
resulted from negative UV-B effects. Both species
were most likely to occur at moderate UV-B levels.
Ambystoma macrodactylum showed this pattern only
in Glacier National Park. Occurrence of
A. macrodactylum increased as UV-B increased in
Olympic National Park despite UV-B levels similar
to those recorded in Glacier. We also found
marginal support for a negative association with
UV-B for P. regilla in one of the two parks where it
occurred. We did not find evidence of a negative
UV-B effect for any other species. Much more work
is still needed to determine whether UV-B, either
alone or in concert with other factors, is causing
widespread population losses in amphibians. |
| Genre: | Article |
| ProdID: | 1016397 |
| Citation Author: | Adams, Michael J.; Hossack, B. R.; Knapp, R. A.; Corn, P. S.; Diamond, S. A.; Trenham, P. C.; Fagre, D. B. |
| Citation Contributing Office: | Forest and Rangeland Ecosystem Science Center |
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| Citation End Page: | 500 |
| Citation Issue: | 5 |
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| Citation Language: | English |
| Citation Larger Work Title: | Ecosystems |
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| Citation Month: | AUG |
| Citation No Pagination: | |
| Citation Number Of Pages: | 13 |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | p. 488-500 |
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| Citation Search Results Text: | Distribution patterns of lentic-breeding amphibians in relation to ultraviolet radiation exposure in western North America; 2005; Article; Journal; Ecosystems; Adams, Michael J.; Hossack, B. R.; Knapp, R. A.; Corn, P. S.; Diamond, S. A.; Trenham, P. C.; Fagre, D. B. |
| Citation Start Page: | 488 |
| Citation Volume: | 8 |
| Citation Year: | 2005 |
| Type: | citation/reference |
| Text: | Distribution patterns of lentic-breeding amphibians in relation to ultraviolet radiation exposure in western North America; 2005; Article; Journal; Ecosystems; Adams, Michael J.; Hossack, B. R.; Knapp, R. A.; Corn, P. S.; Diamond, S. A.; Trenham, P. C.; Fagre, D. B. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sat, 1 Jan 2005 00:00 -0600 |
| Publisher: | |
