Graduate Thesis Or Dissertation
 

Benthic algal communities of the Metolius River

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  • Samples of benthic algae were collected from the Metolius River of central Oregon at two-week intervals between April 15, 1967 and March 9, 1968. Species of filamentous algae and diatoms present were recorded for every sampling station on each sampling date. Permanent mounts of diatom frustules were prepared. This sampling revealed a community dominated by species of Cladophora, Achnanthes, and Spirogyra to be present throughout much of the study area on a year-round basis. Although seasonal distributions were evident for some species, the majority of species were perennial. In view of the fact that the physical and chemical characteristics of the Metolius River remained constant over the year, such seasonal periodicity as was observed may be attributed to changes in available solar radiation. The described community was distributed throughout the study area with the exception of the headwaters and the sampling station immediately downstream. Species of diatoms were dominant at these two sites, with filamentous forms not well established. Species of filamentous algae were found regularly at downstream sampling sites where current velocity was somewhat reduced. This Cladophora - Achnanthes - Spirogyra community was similar in species composition to other previously described Cladophora communities, and appears to be characteristic of a cold mountain stream which is free of organic pollution.
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