4Alford RA,Dixon PM,Pechmann JHK.Global amphibian population declines[J].Nature,2001,414:449-500.
5Blaustein AR,Wake DB.The puzzle of declining amphibian populations[J].Scientific American,1995,272:52-57.
6Blaustein AR,Romansic JM,Kiesecker JM,et al.Ultraviolet radiation,toxic chemicals and amphibian population declines[J].Diversity and Distributions,2003,9:123-140.
8Khangarot BS,Ray PK.Sensitivity of toad tadpoles,Bufo melamostictus(Schneider),to heavy metals[J].Bulletin of Environmental Contamination and Toxicology,1987,38(3):523-527.
9Khangarot BS,Sehgal A,Bhasin MK.Man and biosphere-studies on the Sikkin Himalayas.Part5:Acute toxicity of selected heavy metals on the tadpoles of Rana hexadactyla[J].Acta Hydrochim Hydrobiol,1985,13(2):259-263.
10Bundy KJ,Berzins D,Millet L.Heavy metal speciation and uptake in crayfish and tadpoles[J].Joint Conference on the Environment,1996,5(1):41-55.