Amphibians make good environmental indicators because they tend not to move very far during their lifespan. This makes them particularly sensitive to local environmental changes. Amphibians also have delicate skin that is much less protective against chemical stressors than is the tougher skin of other organisms. Because amphibians may be among the first affected by environmental damage, monitoring their populations is important. Amphibian populations are monitored by through frog-calling censuses in the spring, and by sampling for tadpoles, salamanders, newts, and frogs in pools and wetlands along the Great Lakes shorelines.
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