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Rosentreter, Roger

Biological soil crusts and their recovery from long-term livestock impacts were studied in three sagebrush communities in east-central Idaho. In 1996, biological crust and vascular plant cover were measured outside and inside of livestock exclosures in Wyoming big sagebrush (Artemisia tridentata ssp. wyomingensis), mountain big sagebrush (Artemisia tridentata ssp. vaseyana), and low sagebrush (Artemisia arbuscula) communities. The Wyoming big sagebrush exclosure had the greatest cover of biological crust relative to the vascular plant canopy. Biological crust cover was double inside the Wyoming and mountain big sagebrush exclosures compared to the areas outside, indicating substantial recovery since release from...
Aspen are thought to be declining in this region due to a combination of fire suppression, grazing and wildlife management practices, and potentially cool/wet climates of the past century which favor advancing conifer succession. Many scientists are concerned that aspen?s related species may also be losing habitat, thereby threatening the long-term local and regional viability of this important community. To date, few studies have specifically examined the role of aspen?s epiphytic lichen community. This paper presents basic community research describing the application of Indicator Species Analysis for lichens growing on aspen stems in the central Rocky Mountains of North American. Results show unique lichen assemblages...
Vagrant lichen taxa are presently recognized in several genera. Xanthoparmelia contains the largest number of vagrant taxa and is the most widely distributed geographically, with vagrant taxa represented in several habitats in North America and other continents. Aspicilia has the second largest number of vagrant taxa worldwide, including A. fruticulosa (Eversm.) Flagey, reported new for North America from Idaho, Montana, Oregon, Utah, and Wyoming. Habitat supporting vagrant lichens is typically windswept, semi-arid, and sparsely vegetated. In some areas attached, erratic, and vagrant taxa of Rhizoplaca occur sympatrically. Environmentally modified erratic forms of attached taxa of Dermatocarpon, Lecanora, and Umbilicaria...
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