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Biological Soil Crusts

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Abstract:: This USGS Canyonlands Research Station site features a series of web pages focusing on biological soil crusts. Biological soil crusts are the community of organisms living at the surface of desert soils. The site provides a menu of links to biological soil crust pages including Crusts 101: an introduction to biological soil crusts, an advanced page with a downloadable 90-page report on soil crusts, a gallery of biological soil crust images and figures, references, the Canyon Country Ecosystems Research Site (CCERS), and other related links.

Subject:: Science and Technology
Grade Level:: Post-secondary
SubTopics:: Soil and Land
Collection:: USGS

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Lichens on chaparral shrubs at Tucker Wildlife Sanctuary in Orange

(Complete Item Description)

Abstract:: The fungi provide the water needed by the unicellular organism for photosynthesis. Lichens also fix nitrogen from the atmosphere into organic forms that can be used by other organisms. Lichens are sensitive indicators of air pollution. Nancy Pelaez

Subject:: Science and Technology
Grade Level:: Primary, Secondary
SubTopics:: Water
Collection:: Video and Image Data Access

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Who Are the Plants?

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Abstract:: This online article, from Biodiversity Counts, offers a brief overview of the plant kingdom. Specifically, it covers: why plants have their own kingdom, Plantae; what separates the kingdom's two very basic categories; the plant kingdom's 10 divisions, including the number of species in each; and why some organisms that seem like plants belong instead to the kingdom Protista or the kingdom Fungi.

Subject:: Science and Technology
Grade Level:: Secondary, Post-secondary
SubTopics:: Plants and Forests
Collection:: American Museum of Natural History

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