Ecology/paleontology. Colorado River clams provide benchmark.
Conservationists have long contended, largely in impressionistic terms, that 70 years of American dam building and water diversion have destroyed the biological richness of the Colorado River delta, a key nursery of marine life at the end of the Southwest's great watercourse. Now researchers have confirmed those suspicions, using an important ecological player--clams--as a quantitative marker.
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D000818:Animals; D049872:Bivalvia; D003247:Conservation of Natural Resources; D017753:Ecosystem; D005618:Fresh Water; D010163:Paleontology; D015206:Southwestern United States