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Phytoplankton biovolume can be measured or calculated through the calculation of similar geometric models. A set of geometric models is suggested for calculating cell biovolume and surface area for 284 phytoplankton genera in China Sea waters. Thirty-one geometric shapes have been assigned to estimate the biovolume and surface area of phytoplankton cells. Reductions of error and microscopic effort are also discussed. The model has been verified by its application in the China Seas regions. The software to make these calculations is available at  http://www.ouc.edu.cn/csmxy/sunjun/biovolume.htm

Geometric models for calculating cell biovolume and surface area for phytoplankton