The Relationship to the Temperature to Phycoperiphytic Standing Crop and Diversity
VandenBosch, Kathryn A.
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Physiochemical data indicate that Castor Creek receives seepage in the region of its headwaters from an adjacent thermal canal. This study was undertaken to determine the impact of this thermal seepage. on the phycoperhhytic community in the creek. The algae were sampled by placing glass slides in the creek as a. artificial substrate for growth for four weeks during winter. Slides were analyzed for concentration of chlorophylls and carotenoids and for ash weight as estimates of standing crop. The generic composition of the algae on the slides was determined. Community diversity was measured by the Shannon-Weaver diversity index and the Renee's series method. Results from Castor Creek were contrasted with data obtained from another thermal system and two natural systems. Castor Creek showed a shift in the algal flora represented on the slides from a blue-green and green filamentous community at the headwaters to a diatom dominated community downstream. Peaks in the two estimates of standing crop coincided with the peak for percentage of filamentous algae and the peak for percentage of diatoms. Diversity and evenness remained relatively constant throughout Castor Creek with the exception of a decline· in the parameters at the last site. This indicates that the elevated water temperatures in Castor Creek may, not serve as a thermal stress since diversity and evenness are not depressed in the upper portion of the creek. Results Show that temperature was highly correlated with alkelinity, hardness and dissolved oxygen and thus, differences in phycoperiphytic diversity. and· standing crop cannot be ascribed to temperature alone in this study.