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| Abstract: | Cover: Climate-change models project warmer air temperatures worldwide (upper left) and decreased summertime precipitation in many regions (upper right), which could result in warmer streams and lower water levels. Such conditions may facilitate the expansion of invasive species, such as this signal crayfish ( Pacifastacus leniusculis ) (photo by Jeremy Monroe, Freshwaters Illustrated). See Special Section, pages 518–592. |
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