Fig. 2

Growth of Hyophila involute in different calcium environments. A the growth state of Hyophila involuta before treatment with Ca²⁺ solution, (B) the growth state of Hyophila involuta after 2 months of culture with Ca²⁺ solution. ①:Ca²⁺ concentration is 0 mmol/L, ②:Ca²⁺ concentration is 50 mmol/L, ③:Ca²⁺ concentration is 100 mmol/L, ④:Ca²⁺ concentration is 200 mmol/L, ⑤:Ca²⁺ concentration is 400 mmol/L, ⑥:Ca²⁺ concentration is 800 mmol/L