Search

The historical role of fire in sagebrush (Artemisia tridentata) landscapes remains poorly understood, yet is important to inform management and conservation of obligate species such as the threatened Gunnison Sage‐grouse (GUSG; Centrocercus minimus). We reconstructed fire histories from tree‐ring fire scars at sagebrush–forest ecotones (10 sites, 111 trees) to better understand the role of fire in sagebrush landscapes of the Upper Gunnison Basin (UGB), Colorado, and how fire may have changed following Euro‐American settlement. We assessed likely influences of historical fire by surveying plant composition and structure at 100 sagebrush sites with and without recent (2001–2020) fires. Tree‐ring fire scars revealed a history of repeated low‐severity fire at sagebrush–forest ecotones until 1892, followed by over a century without fire. Between 1684 and 1892, the mean fire interval (MFI) among sites averaged 49.6 years (ranging from 18.2 to 119 years). Fire over this period occurred synchronously at two or more sites on average every 23.6 years, potentially indicative of spread between sites. Most (70%) of the historical fires burned in the early growing season, consistent with times of strong wind. Recent burns exhibited reductions in sagebrush cover (5% vs. 25% in unburned sites) and concomitant increases in herbaceous cover (55% vs. 40%). These differences declined over time but persisted for at least two decades. Burned sites were dominated by native perennial grasses, forbs, and resprouting shrub species. Historically, such openings may have served as seasonal GUSG habitat. Our results indicate that parts of the UGB sagebrush landscapes were characterized historically by frequent fire and dynamic vegetation mosaics that included open, grassy patches. These findings support the use of prescribed fire to restore and maintain this ecological process and vegetation heterogeneity. However, the contemporary context for fire has changed and now includes substantially reduced, Endangered Species Act (ESA)‐listed GUSG populations, increased risk of non‐native plant invasion, and climate warming. These circumstances highlight new risks, information needs, and opportunities for key knowledge co‐production via management–research partnerships. [ABSTRACT FROM AUTHOR]

Behavioral analysis of sage grouse, Centrocercus urophasianus, from Gunnison CO, indicates phenotype differences in the Gunnison population, suggesting a variation in the expression of secondary sexual traits. Male secondary sexual characteristics and strut displays, which show special visual and acoustical properties, typify the Gunnison sage grouse population. Species which show strong sexual selection indicate rapid inter-populational variations in male traits and female preferences.

JESSICA R. YOUNG [1,7] CLAIT E. BRAUN [2,6] SARA J. OYLER-McCANCE [3,4] JERRY W. HUPP [5] TOM W. QUINN [4] ABSTRACT-The Gunnison Sage-Grouse (Centrocercus minimus) is described as a new [...]

Mackenzie, Aulay, Andy S. Ball, and Sonia R. Virdee. 1998. Instant Notes Series. Springer-Verlag, New York. vii + 321 pp. $24.95, ISBN: 0-387-91561-3. An increasingly challenging task faced by undergraduates [...]

Recently, considerable attention has been focused on sexual selection in lekking species. In this book, Johnsgard reviews current and historical studies of the role of sexual selection in the evolution [...]