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Lynx kitten from a female in spruce-beetle kill
Spruce-bark beetles impacted about 480,000 acres of spruce-fir forests in southern Colorado and are spreading at the rate of 100,000 acres annually.  A central question is how to salvage for timber production insect-impacted forests in ways consistent with the management and conservation of Canada lynx, a federally-listed species.
Westslope cutthroat trout, native to the Columbia River and upper Missouri River hybridize with introduced rainbow trout and have been extirpated from large portions of their historical range.
Hybridization between westslope cutthroat trout and both rainbow trout and Yellowstone cutthroat trout is a major conservation concern for the species.  A new broad-scale analysis of hybridization patterns found many pure populations of westslope cutthroat trout in headwaters streams.
African lion. Photo: S. Cushman
Populations of large carnivores are declining globally, and in Africa the ranges of lions, leopards, wild dogs and spotted hyenas have contracted dramatically in the past few decades. The goal of this project is to assess current population distribution and connectivity for these species across a vast trans-boundary region of Southern Africa, comprising the Kavango-Zambeizi Trans-Frontier Conservation Area (KAZA), which consists of most of...
landscape shot of beetle killed forest
Forest restoration, resilience, and wildfire are major issues of contemporary forest management. Integral to these issues is the destruction, understanding, and management of mountain pine beetles. This is the story of 115 years of mountain pine beetles, associated organisms and the people that study them in the Black Hills. It reads much like a film-noir. This research informs forest policy and management throughout western North America.  
Florida Everglades. Photo credit: National Park Service.
Low-temperature events (i.e. minimum daily temperatures < 5°C) in subtropical coastal regions can have a strong influence on landscape structure and community composition. In the Everglades region, low-temperature events may become less common, driving shifts in species distributions and carbon (C) dynamics.
A fundamental goal of biogeography is to understand the factors that drive spatial and temporal variability in forest growth across large areas. The Interior West Forest Inventory and Analysis program collected tree-ring data from thousands of plots that can be used to investigate controls on growth variability. Understanding the factors that control growth are important for managing species that could exhibit range shifts in response to climate...
Cross section of a dead Utah juniper.
Annual precision of tree-ring data is often sought for detailed analyses. Important, widespread species such as ponderosa pine and Douglas-fir are often used for tree-ring science. However, there are other low elevation species, oftentimes termed woodland trees that could also be useful, including Utah juniper.
Interior West states showing FIA plots and plots with tree-ring data.
Tree-ring data collected as part of the Forest Inventory and Analysis program in the Interior West is being assembled into a massive dataset with many tens- of thousands of trees. Given the underlying sampling approach to the Forest Inventory and Analysis grid, the tree-ring data collected can be used for many novel research applications.
Stand of aspen in decline
There is considerable interest in the growth and mortality of quaking aspen in the western United States. Looking at the past 10 years of silvicultural treatments to promote aspen regeneration we quantified the factors most influential on subsequent reproduction. Herbivory pressure (domestic and native ungulates) and the presence of advance reproduction best predicted aspen regeneration response.

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