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Synopsis: One of the most important trends in biodiversity is the increase in the number of species as the land area increases. Botanists call this trend the species-area relationship, and it is one of the most dependable rules in biology. Many human activities on the landscape, influence species directly by disrupting their habitat, by removing other organisms upon which they may depend, or by injuring or killing them. Less direct, but in many cases equally as disruptive to the native species of an area, is the introduction of exotic species. In this study, data from published studies on flora over the last two centuries was used to produce contour maps of flora size and percentage of exotic species in North America...
Categories: Publication;
Types: Citation,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Land use configuration,
Landscape fragmentation,
North America,
biodiversity,
flora,
Symphyotrichum expansum (Puepp ex Spreng.) Nesom is reported new to Utah from the Escalante River drainage. A major range extension is reported for Aralia racemosa L. in the Escalante drainage, and additional populations are reported of the rare species Imperata brevifolia Vasey in Utah, including the 1st record for the Grand Staircase--Escalante National Monument. Heterotheca grandiflora Nutt. is reported new to north central Arizona. New locations and notes on an additional 22 rare species in Glen Canyon National Recreation Area are listed. Published in Western North American Naturalist, volume 65, issue 1, on pages 103 - 111, in 2005.
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Arizona,
Glen Canyon National Recreation Area,
Utah,
Western North American Naturalist,
dispersal,
A total of 243 new species records, 60 new generic records, and 11 new family records were documented for Canyon de Chelly National Monument, bringing the known flora of the Monument to 771 species. This work is part of an inventory carried out throughout the National Park Service as part of the Natural Resource Challenge, a legislative and administrative mandate. Four species are on or proposed for the Navajo Nation Endangered Species List. Additions to the flora include Carex specuicola, a Listed Threatened species, and Zigadenus vaginatus, both on the Navajo Endangered Species List. Astragalus chuskanus, Cirsium chellyense, Lupinus caudatus subsp. cutleri, and a white-flowered form of Mertensia oblongifolia are...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Arizona,
Canyon de Chelly,
Journal of the Torrey Botanical Society,
Torrey Botanical Society,
biological inventory,
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