| Abstract: | Several species of frogs and toads are in serious decline in the Sierra Nevada Mountains of California. These species include the threatened red-legged frog ( Rana aurora ), foothill yellow-legged frog ( R. boylii ), mountain yellow-legged frog ( R. muscosa ), Cascades frog ( Rana cascadae ), western toad ( Bufo boreas ) and Yosemite toad ( B. canorus ). For many of these species current distributions are down to 10% of historical ranges. Several factors including introduced predators, habitat loss, and ultraviolet radiation have been suggested as causes of these declines. Another probable cause is air-borne pesticides from the Central Valley of California. The Central Valley, especially the San Joaquin Valley, is a major agricultural region where millions of pounds of active ingredient pesticides are applied each year (http://www.cdpr.ca.gov/dprdatabase.htm). Prevailing westerly winds from the Pacific Coast transport these pesticides into the into the Sierras. |
| Genre: | Article |
| ProdID: | 5224596 |
| Citation Author: | Sparling, D.W.; Fellers, G.; McConnell, L. |
| Citation Contributing Office: | Patuxent Wildlife Research Center |
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| Citation End Page: | 201 |
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| Citation Language: | English |
| Citation Larger Work Title: | Scientific World Journal |
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| Citation Number Of Pages: | 2 |
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| Citation Phsyical Description: | 200-201 |
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| Citation Publisher: | Hindawi Publishing |
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| Citation Search Results Text: | Pesticides are involved with population declines of amphibians in the California Sierra Nevadas; 2001; Article; Journal; Scientific World Journal; Sparling, D.W.; Fellers, G.; McConnell, L. |
| Citation Start Page: | 200 |
| Citation Volume: | 1 |
| Citation Year: | 2001 |
| Type: | citation/reference |
| Text: | Pesticides are involved with population declines of amphibians in the California Sierra Nevadas; 2001; Article; Journal; Scientific World Journal; Sparling, D.W.; Fellers, G.; McConnell, L. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1100/tsw.2001.36 |
| Date Other: | Wed, 16 Jun 2010 00:00 -0500 |
| Publisher: | Hindawi Publishing |
