Biology

U.S. Bureau of Reclamation

A new study says endangered razorback suckers upstream of Lake Powell may struggle to migrate up the San Juan River to spawn. The fish are blocked by a waterfall that formed two decades ago when the river changed its course. KNAU’s Melissa Sevigny reports. 


Melissa Sevigny

Some people collect pinyon pine nuts this time of year for a tasty autumn treat. Others sell them for extra income. But Catherine Gehring of Northern Arizona University goes nut-gathering every September for a different reason. She researches ways pinyon pines survive drought—at a time when a hotter, drier climate is predicted to drive the trees out of Arizona entirely. KNAU’s Melissa Sevigny spoke with her in the woodlands east of Flagstaff.

Jut Wynne

A biologist from Flagstaff recently discovered eight new invertebrate species while investigating tropical caves in southeastern China near the Vietnam border. 


USGS

This weekend, managers at Glen Canyon Dam will begin a first-of-its-kind experiment to release water that benefits bugs, which play a vital role in the Colorado River ecosystem. KNAU’s Melissa Sevigny reports.


National Park Service

Scientists have made the first-ever map of how tamarisk beetles have spread into the Grand Canyon from other states. The leaf-eating beetles were introduced to control the invasive trees. But as KNAU’s Melissa Sevigny reports, they weren’t supposed to survive as far south as Arizona.

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