Indicator Species in the Desmid Staurastrum.

摘要

A Staurastrum sp. has been cultured for the first time in uni-algal,bacteria-free culture in a defined,low salts,inorganic medium. Carbon dioxide was found to be a limiting factor for the organism's growth in axenic laboratory culture. Glycyl-glycine (80mg/100ml) was found to be an effective buffer,counteracting the acid pH levels created by carbon dioxide bubbling. The lack of sensitivity of Staurastrum growth rates to small changes in phosphate concentration made this organism a poor indicator of the nutrient condition of natural waters.