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By Ronald M. Atlas (auth.), K. C. Marshall (eds.)

ISBN-10: 1468489895

ISBN-13: 9781468489897

ISBN-10: 1468489917

ISBN-13: 9781468489910

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Algal populations recolonized cleared surfaces either through vegetative regrowth of surviving individuals or by recruitment from spores. Boulders that are experimentally cleared are colonized within the first month by a mat of the green alga Ulva. In the fall and winter of the first year after clearing, several species of perennial red algae colonize the surface. If there is no intervening disturbance, Gelidium canaliculata gradually dominates the community, holding 60-90% of the cover after 2-3 years.

The results suggest a nonequilibrium view of community structure and disturbances that open space for the maintenance of diversity in most communities of sessile organisms. Grimes et al. (1980) compared epiphytic diatom assemblages on living and dead stems of the common grass Phragmites australis. Diatoms epiphytic on P. australis were collected from a single clone at the southern end of Provo Bay, Utah Lake, Utah. Diatom populations of both living and dead stem sections were analyzed. The species diversity in each sample was high, indicating that the stems provided a relatively stable habitat for diatom epiphytes.

Factor analysis has been used by Sundman (1970, 1973) to describe soil microbial populations, by Vaatanen (1980) to Table II. , a lack of nutritional diversity; (Ne ) nutritional versatility for utilization of carbohydrates; (Na) nutritional versatility for utilization of alcohols; (Nea ) nutritional versatility for utilization of carboxylic acids; (Naa ) nutritional versatility for utilization of amino acids; (Nh ) nutritional versatility for utilization of hydrocarbons. bOligotrophs were isolated on a low-nutrient medium, copiotrophs on a peptone-based medium.

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Advances in Microbial Ecology by Ronald M. Atlas (auth.), K. C. Marshall (eds.)

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