Pinyon-juniper woodlands host unique wildlife and wildlife habitat, as well as areas for hiking and outdoor recreation. They are also part of a web of healthy ecosystems that, together, help to balance water availability, storage and runoff; and prevent erosion. A new study published in Global Ecology and Biogeography and led by University of Nevada, Reno researcher Robert Shriver sheds new light on what is happening in pinyon-juniper woodlands across the West. The research is unique, in that it looks at both tree mortality, as well as recruitment, or new seedlings and saplings, to calculate a "net effect." And, the news isn't necessarily good, particularly in warmer, drier locations.