Date of Award

Spring 2024

Project Type

Thesis

Program or Major

Natural Resources and Environmental Studies

Degree Name

Master of Science

First Advisor

Rebecca Rowe

Second Advisor

Ryan Stephens

Third Advisor

Erik Hobbie

Abstract

Within arctic ecosystems, small mammals (voles and lemmings) influence plantcommunity composition, soil nutrient availability, and carbon cycling through foraging and the deposition of waste. Yet, little is known about rodent diet specifically and how it may vary annually and seasonally. Here, we characterize the composition and stability in tundra vole (Microtus oeconomus) diet in northern Alaska using stable isotope analysis of fecal and hair samples collected over a seven-year period. Results from Bayesian stable isotope mixing models from both fecal and hair sample data show that tundra voles in northern Alaska predominately feed on rhizomatous sedges, Eriophorum vaginatum and Carex bigelowii, throughout the summer season. However, the plant part consumed shifts from rhizomes in early summer to tillers and buds in late summer after green-up. We found strong overlap in diet composition among years and an increase in tundra vole dietary niche breadth with population abundance. By studying diet, we can gain a better understanding of plant-animal interactions in the Alaskan tundra and how these interactions may shift under climate change or other disturbances.

Download

Share

COinS