Abstract
Chaetoceros muelleri Lemm. was isolated from lower Chevelon Creek, Arizona and cultured in a defined medium. Maximum division rates occurred at temperatures between 20 and 30°C with mean doublings per day sharply decreasing above and below this temperature range. No divisions occurred at 40°C. Chaetoceros muelleri showed maximum division rates (>1·5 divisions day-1) in solutions with specific conductance values between 3·0 and 20·0 mmhos cm-1 (2-12·5‰. salinity). Division rates decreased abruptly in media with conductance values 33·0 mmhos cm-1 ( 22‰. salinity). No significant differences in maximum division rates were measured in media dominated by Na+ and Mg++ salts, while division rates were significantly reduced in media dominated by Ca++ and especially K+ salts. Comparisons in distribution and salinity requirements are made ...
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