AMPHIBIANS Bioindicators and Sentinel organisms of Metal Pollution

AMPHIBIANS Bioindicators and Sentinel organisms of Metal Pollution

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Amphibians are a class of ectothermic, tetrapod vertebrates that include frogs, toads, salamanders, newts and caecilians. The majority of species lay eggs undergo metamorphosis, moving from a larval stage (usually aquatic) through the development of limbs and lungs to become terrestrial adults. Almost all species are dependent on moist conditions, and many require freshwater habitats in which to breed. The greatest diversity occurs in tropical forests, with species richness generally lower in temperate and arid regions. Amphibians are excellent indicators of the quality of the overall environm...