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Algal Distribution in Six Thermal Spring Effluents

Russell G. Kullberg
Transactions of the American Microscopical Society
Vol. 90, No. 4 (Oct., 1971), pp. 412-434
Published by: Wiley on behalf of American Microscopical Society
DOI: 10.2307/3225456
Stable URL: http://www.jstor.org/stable/3225456
Page Count: 23
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Algal Distribution in Six Thermal Spring Effluents
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Abstract

The distribution of algae was studied in six thermal springs of western Montana: Alhambra (north), 54.4 C; Alhambra (south) 48.0 C; Boulder, 61.3 C; Jackson, 61.5 C; Lolo, 46.0 C; Pipestone, 59.5 C; and Sleeping Child, 52.0 C. The blue-green algae (Myxophyceae) were the only algae near the sources of the streams. The mean maximum temperature endured by the diatoms (Bacillariophyceae) was 43.2 C; by the green algae (Chlorophyceae), 40.9 C. Presence lists of the algae along a temperature gradient indicate the order in which the algae appeared in the stream as the water cooled. The per cent volumes for the major and intermediate species were plotted along the temperature gradient to show the interactions among the populations of the continuum. The streams containing the greatest variations of habitats resulted in more erratic curves of several modes among the major populations and scattered occurrences among the intermediate species. Variations in types of habitats downstream promoted the relocation of translocated algal masses until overwhelmed by the previously established populations. Five new taxa are described: Chamaesiphon prescotti n. sp.; Pseudanabaena oblonga n. sp.; Synechococcus lividus Copeland var. nanum n. var; Oscillatoria geminata Copeland var. fragilis forma breve n. forma; Oscillatoria geminata Copeland var. tenella forma minor n. forma.

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