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of the Sonoran Desert region. The spring flowering of ironwood, and the bat species migration arrivals also become indicators of annual or multi-year climate trends for regions of the Sonoran Desert.

Fauna

Flora

The Lower Colorado River Valley has unique plant communities because it is the most arid part of the desert and it has the highest temperatures, in excess of 120 F during the summer. The low humidity means that most plants must have mechanisms that deal with severe water loss through evaporation. The soils

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