This study was part of a broad effort to understand the role of native ungulates in the dynamics of old-growth forests in Olympic National Park, Washington. The authors examined the structure and patch dynamics of understory vegetation in an old-growth Sitka spruce (Picea sitchensis)-western hemlock (Tsuga heterophylla) forest. Grass dominated patches disappeared following 8 years of protection from ungulate herbivory. Ungulates maintained a reduced standing crop, increased forb species richness, and determined the distribution, morphology, and reproductive performance of several shrub species. The authors note there is clearly a dynamic relationship between patch type, tree fall, and ungulate herbivory in these old-growth forests. The results show that ungulate herbivory is a driving force shaping vegetation patterns in coastal coniferous forests.
Citations and enhanced abstracts for journals articles and documents focused on rangeland ecology and management. RSIS is a collaboration between Montana State University, University of Idaho, and University of Wyoming.