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.
This seven-page guide can be used to identify freshwater microorganisms. Categories include microscopic autotrophic organisms (i.e. algae), heterotrophic protozoa, other freshwater plankton (Animalia, Monera, etc), and arthropods. The guide is in the form of a table, with columns for name, picture, characteristic, and taxonomy.
For many students, light-driven electron-transport can be abstract and with little utility. To provide additional ways of visualizing this process, this series of exercises is designed (1) to show that the light-reactions of photosynthesis are proportional to light intensity and can be monitored in isolated chloroplast-particles, (2) to demonstrate that chlorophyll, in solution, traps and re-emits light by fluorescence, and (3) to observe increases in chlorophyll fluorescence in intact green-algae when cultures are treated with herbicides that block electron transport. These exercises were adapted from Laboratory Exercises in Plant Physiology by D. E. Balint and E. A. Funkhouser (Ginn Press, 1993).
In performing this exercise students will become familiar with forming, analyzing, proposing, and testing hypotheses and will begin thinking about how ecological principles operate in real systems.
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