Tucson

Environment

For species dependent on monsoon flooding in desert southwest, mosquitoes unwelcome competition

When the monsoon rains settle over Tucson and the rest of the U.S. southwest, they bring with them enough rain that water-dependent species go into hyperdrive. They must feed, mate, breed and create life in the shadow of a few days or weeks. But with the arrival of West Nile virus, cities are moving to rid the area of water — and breeding grounds for all kinds of animals — faster than ever.

Environment

Looking for Consequences of Shifting Seasons

The shifting of the seasons as the world warms up is putting a new focus on the field of phenology. As The World's Clark Boyd reports, scientists are trying to track winners, losers and ecological relationships that are getting out of whack.

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Invasion of the Invasives

Scientists and volunteers in Arizona's Saguaro National Park are trying to keep the non-native buffelgrass from taking over. The invasive plant spreads like wildfire, and enables wildfires to destroy precious desert habitat.