Why is the Mohave tui chub facing extinction anyway?

Exactly why the Mohave tui chub is facing extinction is unknown, however some contributing causes have been suggested. They range from natural cyclic long-term and climate change across the Mojave to the multiple impacts of human habitation in and along the Mojave River’s Watershed. In recent history, however, it is believed that human impacts (the introduction of non-native plants, amphibians, and fish to the watershed coupled with the exploitation of groundwater reserves) have had the greatest impact when coupled with the natural cycles of flooding and drought across the watershed.

At present there are added concerns about weather or not the existing gene pool within the current refugia populations is rich/broad/diverse enough support a population that can adapt to changing condition that might exist across the watershed.