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We studied how the extensive diversion of Colorado River water, induced by dams and agricultural activities of the last 70 years, affected the growth rates of two abundant bivalve mollusk species (Chione cortezi and Chione fluctifraga) in the northern Gulf of California. Shells alive on the delta today ('Post-dam' shells) grow 5.8-27.9% faster than shells alive prior to the construction of dams ('Pre-dam'...