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0SS 0SS 0SS agencies Albuquerque artesian springs Balmorhea area Balmorhea State Recreation Brune Chihuahuan Desert CM CM CM Comanche Springs pupfish Copeia Cyprinodon elegans Cyprinodon species Cyprinodontidae Dexter National Fish downstream earthen canal ecological endangered species Fish and Wildlife flooding of irrigation flows from Phantom Gambusia nobilis Giffin Springs habitat loss head of Phantom Hubbs hybrid hydrology introduced species—Hubbs 1981 irrigation canals irrigation ditches irrigation system Joe Kingston Lake Balmorhea landowners major threats management plan Mexico o0goi0g occurs Parks and Wildlife Pecos County Pecos River Phantom Lake Canal Phantom Lake Spring Power Resources Service present propaga-1 pupfish habitat pupfish population Pupfish Recovery Plan Recreation Area Reeves County Water refugium canal San Solomon Springs Solomon and Giffin springs near Balmorhea Springs Pupfish Recovery stenothermal spring outflows Texas Parks threatened status Toyah Creek type locality U.S. Fish upstream variegatus Water and Power water from Phantom Wildlife Department Wildlife Service