4ALFORD R A,DIXON P M,PECHMANN J H K.Global amphibian population declines[J].Nature,2001,414:449-500.
5BLAUSTEIN A R,WAKE D B.The puzzle of declining amphibian populations[J].Scientific American,1995,272:52-57.
6BLAUSTEIN A R,ROMANSIC J M,KIESECKER J M,et al.Ultraviolet radiation,toxic chemicals and amphibian population declines[J].Diversity and Distributions,2003(9):123-140.
7ROY J I.Environmental contaminants encyclopedia chromium(in general)entry[EB/OL].National park service,1998.http://www.nature.nps.gov/hazardssafety/toxic/index.cfm.
8LEE H Y,STUEBING R B.Heavy metal contamination in the river toad,Bufo juxtasper (Inger),near a copper mine in East Malaysia[J].Bull Environ Contam Toxicol,1990,45:272-279.
9FORT D J,STOVER E L.Effect of low-level copper and pentachloropheol exposure on various early life stages of Xenopus laevis[C]//Bengtson D,HenshelD.Environ toxicol risk assess:biomarkers and risk assessment:fifth VolA STM STP,American society of testing and materials.USA Philadelphia:PA,1996.
10LOMBARDI J V,PERPETUO T R,FERREIRA C M,et al.Acute toxicity of the fungicide copper oxychloride to tadpoles of the bullfrog Rana catesbeiana[J].Bull Environ Contam Toxicol,2002,69:415-420.
