Biodiversity Graduate Student Research Enhancement Grants

Despite underpinning many of the fitness outcomes observed within ecology, fundamental information on food preferences, resultant fitness benefits, and the distribution of those key foods is lacking for many wildlife species of concern. A more complete understanding of interactions between these factors is needed to address wildlife population declines and habitat management, especially in the face of rapid environmental change. Sagebrush songbirds, which include the Brewer’s sparrow (Spizella breweri), sagebrush sparrow (Artemiziospiza tridentata), and sage thrasher (Oreoscoptes montanus), nest within increasingly altered sagebrush habitat and are Species of Greatest Conservation Need in Wyoming. Juvenile stages are defined by high rates of mortality and can function as a bottleneck within songbird populations, which reinforces the importance of examining factors influencing juvenile survival. Nestling morphological traits carryover to influence survival once birds leave their nests and are likely influenced by the food types, rates, and amounts fed to nestlings. Therefore, diet might be a missing link driving trait development and subsequent fitness outcomes in our focal species.

Soil quality is of great importance for ground nesting bees to establish nests and overwinter successfully. Prior research has shown that soil compaction can reduce the diversity of bees capable of creating nests. Some research has connected cattle stocking density in pastures to changes in the bee community, in part due to their trampling of the soil. Combine this with the fact that cattle change vegetation density and floral diversity, and it is easy to see how large grazing animals are ecosystem engineers for bees. No studies, however, have extended this concept to other large ungulates, like elk. At Fossil Butte National Monument, the West Green River elk herd migrates through the park annually. A previous study found that during hunting season, elk congregate in the park to avoid surrounding land where hunting is permitted. This creates the unique opportunity to investigate how the increased trampling and grazing activity of elk in the park affects nesting resources, floral resources, and overall bee diversity compared to reduced elk activity on surrounding land. In doing so, we will expand our knowledge of the ecology of ground nesting bees while providing valuable insights to park management at Fossil Butte National Monument.

Understanding the patterns and processes that underly the creation and maintenance of species diversity is one of the most important questions in evolutionary biology. Knowledge of these patterns and processes are necessary for predicting evolutionary and ecological consequences of changes in species’ distribution and local extirpation. In plants, hybridization, subsequent introgression, and polyploidy are essential processes that can aid in either the creation or breakdown of species boundaries. Arctic and alpine willows (Salix sp.) are known for frequent natural hybridization and polyploidy, making them an excellent system for studying the effects of these processes on species diversity. Using a combination of genomic, morphological, and environmental data from populations of sympatric Salix species across their ranges, it is possible to identify the roles that hybridization and polyploidy play in the maintenance or breakdown of species boundaries in taxonomically complex groups.

My research project is a comprehensive floristic inventory of the Bighorn Mountains in north-central Wyoming. The primary goal is to document the plant diversity, distribution, and ecological patterns across the range, with a particular focus on alpine and subalpine ecosystems. This work contributes to the Rocky Mountain Herbarium by providing high-quality voucher specimens and associated data and supports broader regional and continental-scale studies like the GLORIA Initiative. Through detailed field surveys, I aim to better understand species composition, biogeographic patterns, and floristic affinities.

Breeding bird populations are declining across North America, and among them, western forest birds are experiencing some of the most rapid and widespread losses. The underlying causes of western forest bird declines remain understudied and thus poorly understood. Without insight into what is driving these losses, wildlife stewards are limited in their abilities to develop targeted conservation strategies. Through my Ph.D. research, I aim to test alternative hypotheses and disentangle the mechanisms underlying widespread declines in forest bird populations across the inter-mountain west, including some of the most iconic and ecologically rich landscapes in the United States, such as the Greater Yellowstone Ecosystem. I leverage the unique strengths of large-scale, long-term bird monitoring datasets to assess how environmental changes like forest loss, shifting climate patterns, and altered disturbance regimes are affecting birds at multiple taxonomic levels. The specific goals of my work are to identify primary mechanisms associated with declines, evaluate how these patterns vary spatially, and determine which species may be facing increased threats.

Freshwater mussels are cryptic yet critical components of aquatic ecosystems. They provide habitat structure to other plants and invertebrates, serve as prey for fish, mammals, and birds, and improve water quality through filtration. The White heelsplitter is a mussel native to the Belle Fourche River in Wyoming, including within Devils Tower National Monument. The last assessment of this mussel population was conducted in 2014, which is a length of time almost as long as their lifespan of 12 years. The goal of my project is to resurvey this population 11 years later and update the population status in Devils Tower. Some of the questions we are asking are whether the population has grown or declined since 2014, what is the age structure of the population, and if we can compare modern mussel growth to shells we have in the archaeology record. Our findings will help provide information to managers to conserve White heelsplitters in the state.

As a result of climate induced glacial recession, glacial-fed alpine lakes are increasing globally. Alpine lakes are often nutrient limited and have low primary productivity due to short ice-free seasons, however increased glacial sediment input could increase lake nutrient concentrations with unknown repercussions for native zooplankton communities. This research aims to understand how glacial recession and changes to snow phenology will alter alpine lake ecology by describing the limnology and zooplankton ecology of glacial and non-glacial lakes in the Wind River and Teton Ranges. This work addresses our need to better understand how climate change is impacting vital high elevation pristine ecosystems.

By identifying shifts in bat populations and changes in insect prey composition, my research will provide critical insights into the ecological impacts of WNS in western South Dakota, as well as broader trends in WNS ecology and bat populations across the western USA. This will enable land managers to develop effective, data-driven conservation strategies, supporting a management approach that targets prey species and their habitats at the lower trophic levels, and enhancing ecosystem and bat health in the region.