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Digitale Medien

The controlled assembly of microcosmic communities: the selective extinction hypothesis (1986)

Dickerson, J. E. ; Robinson, J. V.

Springer

Oecologia 71 (1986), S. 12-17

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ISSN: 1432-1939

Schlagwort(e): MacArthur ; Wilson ; Equilibrium model ; Community assembly ; Extinction ; Colonization

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Summary Forty communities were assembled through the controlled inoculation of algae, protozoans and a rotifer according to either of 2 distinct introduction schedules. These introduction schedules were constructed such that species reinvaded on average either every 6 or 8 w. Ten of the 20 beakers experiencing each invasion schedule contained 300 ml of media; the remaining beakers in each invasion category contained 100 ml of media. Species richness consistently increased throughout the initial 4 w and 7 w of the experiment for the low and high invasion rate beakers, respectively. The numbers of species in the low rate beakers were uncorrelated with time during the last half of the experiment; however, species richness gradually declined during this period in the high rate beakers. The extinction rate is shown to be disproportionately higher for large organisms in the small microcosms. Such “selective extinction” is consistent with the MacArthur-Wilson equilibrium model.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00377313

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Digitale Medien

Bacterial adsorption to smooth surfaces: Rate, extent, and spatial pattern (1985)

Nelson, C. H. ; Robinson, J. A. ; Characklis, W. G.

New York, NY [u.a.] : Wiley-Blackwell

Biotechnology and Bioengineering 27 (1985), S. 1662-1667

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Details

ISSN: 0006-3592

Schlagwort(e): Chemistry ; Biochemistry and Biotechnology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Notizen: The influence of bulk-water bacterial cell concentration and specific growth rate history on bacterial adsorption rates to surfaces was investigated using response surface analysis. A pure culture of Pseudomonas sp. 224S was grown in a chemostat and pumped into a continuous flow reactor where the bacteria were exposed to clean, glass surfaces under turbulent flow conditions for a period of six hours. Adsorption rate decreased approximately linearly with increasing specific growth rate history. Glass surfaces became saturated with 224S at ca. 0.1% coverage and the resulting spatial pattern of the adsorbed cells deviated from random in the direction of uniformity.

Zusätzliches Material: 4 Ill.