Professor Spotlight: Melinda Laituri
Laituri was recently appointed as a Jefferson Science Fellow where she will serve a year in Washington, D.C. working with the State Department and U.S. Agency for International Development on water-related issues. She is also Director of CSU's Geospatial Centroid.
Conservationists Crying Wolf? New Study Shows Yellowstone’s Ecosystem Dynamics More Complex than Trophic Cascade
The research is the first to show that reductions in elk numbers following the reintroduction of wolves are proportionate to increases in willow height along streams in Yellowstone. While that could lead to the simple conclusion that wolves improved the ecosystem, their central finding was that the relationship between elk and willow health was also dependent on geography, climate, and water supply for the willows.
“The effects of modifying a food web can’t be predicted by only studying one thing in isolation. No single force explains the patterns of plant establishment and growth in Yellowstone over the past 3 decades,” said CSU Professor Thompson Hobbs, who is also a research scientist at CSU’s Natural Resource Ecology Laboratory and co-author on the paper. “It has been popular and convenient to tell the romantic tale that wolves have restored Yellowstone. But our findings prove that it is not that simple.”
ESS Scientists Discover Climate Change Alters Survival Strategies of Soil Bacteria
Climate forecasters predict that the timing and magnitude of rainfall events will intensify and become more varied in future decades, resulting in longer droughts but bigger downpours. This weather whiplash can wreak havoc on ecosystems and disrupt sensitive organisms such as microscopic soil bacteria that play in ecosystem health, soil fertility and in nutrient cycling. As many as 10,000 species of bacteria can live in a hand full of soil, and each has a different and important role to play within the community. But, little is known about their ability to tolerate or respond to changes in precipitation patterns – until now.
“These soil microbial communities impact ecosystem health, plant communities, carbon emissions, agriculture and much more,” said Sarah Evans, a CSU doctoral graduate and the paper’s lead author. “So, it is important to know how these microorganisms are going to respond to changes in precipitation patterns.”
Evans and CSU Ecosystem Science and Sustainability Professor Matthew Wallenstein examined whether bacterial communities can adapt to long-term changes in their climate, and the survival strategies that allow certain species to thrive under these new conditions. The team collected soil samples from the Rainfall Manipulation Plot Study in the US tallgrass prairie, where intensified precipitation patterns have been simulated for over a decade, as well as samples of soils receiving natural rainfall. The research team conducted a series drying and rewetting pulses on the different soils, and analyzed bacterial communities using a DNA approach.