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I know there are a lot of different species of algae and that each one has different environmental tolerances. I've seen data on different species:

  • brown alga Sargassum echinocarpum J. Agardh - grows well at 35°
  • Dictyopteris australis - grows poorly above 28°
  • halophilic blue-green algae A. fertilissima - temperatures of 47° stimulates germination

What's the highest temperature that growing algae or its spores can survive at? In other words, what temperature would guarantee that no algae could grow afterwards unless reintroduced?

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Based on the habitat of Algaes, a classification called "Thermophytes" can bear high temperature. The Thermophyte algaes use to grow around hot springs and can live around 70°C.

Please find below the reference for all classifications and more details.

http://www.yourarticlelibrary.com/biology/8-types-of-algae-classified-according-to-their-habitats/7098/

http://www.biologydiscussion.com/essay/essay-on-algae/20891

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