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We investigated the influence of anthropogenic threats and hydrologic alteration on fish assemblages within the Lower Colorado River Basin (LCRB). Life history traits of fish assemblages for individual stream segments were summarized by presence/absence data of current (1980-2006) records. To assess anthropogenic threats, we developed a series of ecological(More)
The National Aeronautics and Space Administration (NASA) is developing an architecture for communication, navigation, and time distribution to support the future human exploration of space. Foreseeable applications span a wide range of demands for time services, including event logging by robotic and human explorers, networking of cooperative elements on a(More)
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