Human-caused modification of riverine ecosystems (e.g., construction of mainstem impoundments, diversion and redistribution of water, water pollution, introduction of exotic mollusks) Theme responsible for the imperilment of freshwater mussels in the eastern United States [ THREATENED AND ENDANGERED SPECIES OF MEXICO 0 MCLH 19/09/2016 ]

Over-exploitation of wildlife for commercial purposes, the introduction of harmful exotic (nonnative) organisms Theme , environmental pollution, and the spread of diseases also pose serious threats to our world’s biological heritage. [ WHY SAVE ENDANGERED SPECIES 0 MCLH 19/09/2016 ]

Avoid Introduction of Non-native Plants or Animals Theme Because of similarities in habitat and diet, predatory effects, and habitat modifications, exotic species pose a significant threat to the listed species. [ ENDANGERED AND THREATENED ANIMALS TEXAS 0 MCLH 19/09/2016 ]

Other threats to mussel populations include siltation, the introduction of competing nonnative mussels Theme , stream channelization and dredging, and the impoundment of free-flowing streams and rivers. [ WHY SAVE ENDANGERED SPECIES 0 MCLH 19/09/2016 ]

Contaminants and the potential for introduction of aquatic invasive species (e.g., Zebra and/or Quagga mussels) Theme represent threats to populations of paper pondshell in Canadian River mainstem impoundments [ THREATENED AND ENDANGERED SPECIES OF MEXICO 0 MCLH 19/09/2016 ]

The introduction of non-native predators and competitors Theme also poses a major threat to the karst invertebrates. [ ENDANGERED AND THREATENED ANIMALS TEXAS 0 MCLH 19/09/2016 ]

Additional causes of declines may include deaths caused by people collecting or taking a species, death by pests or predators, natural disasters, introduction of non-native (exotic) species Theme , over harvest, pollution, and pesticides. [ ENDANGERED AND THREATENED SPECIES OF UTAH 0 MCLH 19/09/2016 ]

Although Section 10(j) seems to be the mandatory route for introductions of these 1,360 species Theme , it is not always applied (Doremus 1999). [ ASSISTED COLONIZATION ESA 0 MCLH 19/09/2016 ]

The species is known from adjacent Arizona (Cochise County at San Bernardino NWR), although populations at that site have declined significantly with the introduction of non-native bullfrogs implicated for the decline Theme (Rosen and Schwalbe 1988, Schwalbe and Rosen 1988). [ THREATENED AND ENDANGERED SPECIES OF MEXICO 0 MCLH 19/09/2016 ]

For example, the RGSM was extirpated from the Pecos River in New Mexico and Texas, within 10 years of the introduction and invasion of the congeneric plains minnow (Hybognathus placitus) Theme (Cowley 2006). [ ASSISTED COLONIZATION ESA 0 MCLH 19/09/2016 ]

Introductions of fish and mollusk species from inland rivers, the Gulf Coast Theme , and other sources pose a serious threat to these fishes. [ ENDANGERED AND THREATENED ANIMALS TEXAS 0 MCLH 19/09/2016 ]

Although the primary causes of range-wide declines are attributed to the introduction of non-native species Theme and habitat alteration, additional pressures may be due to intrinsic negative genetic effects. [ THREATENED AND ENDANGERED SPECIES OF MEXICO 0 MCLH 19/09/2016 ]

the contrary nature of “the spirit of Executive Order 11987, which prohibits the introduction of exotic, foreign species Theme into the natural ecosystems of the United States Destination ” (49 FR 33890) [ ASSISTED COLONIZATION ESA 0 MCLH 19/09/2016 ]

Population Theme introductions on the periphery or outside of a species range Destination have lower success rates than when a population is introduced in the core of its historic range (Griffith et al. 1989). [ ASSISTED COLONIZATION ESA 0 MCLH 19/09/2016 ]

The experimental population provision is beneficial for moving endangered species because it encourages the introduction of populations Theme into formerly occupied or new habitat Destination without the full array of legal restrictions that accompany a listed endangered species Method (Doremus 1999; Wolok 2001). [ ASSISTED COLONIZATION ESA 0 MCLH 19/09/2016 ]