Extremely psychrophilic microalgae isolated from the Antarctic ocean

• Main Authors: Hidetoshi Okuyama, Kazuhiro Kogame, Makoto Mizuno, Wataru Kobayashi, Hajime Kanazawa, Shuji Ohtani, Kentaro Watanabe, Hiroshi Kanda
• Format: Report
• Language: English
• Published: Department of Biology,Faculty of Science, Hokkaido University/ Department of Biology,Faculty of Science, Hokkaido University/ Department of Bioproduction,Faculty of Bioindustry, Tokyo University of Agriculture/Department of Biology,Faculty of Science, Hokkaido University/Department of Biology,Faculty of Science, Hokkaido University/National Institute of Polar Research/National Institute of Polar Research/National Institute of Polar Research 1992
• Subjects: Antarctic; Antarctic Ocean; The Antarctic; Antarc*; Polar Biology; Proceedings of the NIPR Symposium on Polar Biology
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=5148; http://id.nii.ac.jp/1291/00005148/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=5148&item_no=1&attribute_id=18&file_no=1

Two psychrophilic strains of unicellular algae were isolated from seawater samples collected in the Antarctic Ocean. The one (strain A) was a species of Cymbella (Bacillariophyceae) and the other (strain B) was a species that belonged to the class Prymnesiophyceae (a prymnesiophyte). Optimum temperatures for growth of both the algae were between 2.5℃ and 5℃. Upper limit temperatures for growth of strain A (Cymbella sp.) and strain B were between 12.5℃ and 15℃ and between 7.5℃ and 10℃, respectively. We suggest that these algae should be categorized into extremely psychrophilic algae from their significantly lower cardinal temperatures for growth.