...Some species have colonies that can be seen all year round, but in the fall the colony breaks down, leaving behind parts of the stalks that overwinter, and in the spring these bud off and form colonies. Freshwater bryozoans usually produce dormant buds to overwinter, but some, such as Stephanella hina , grow colonies in the winter and then produce dormant buds and disappear in the spring. Dormant buds are produced asexually in the stomach cord that connects the stomach to the body wall, and can withstand dryness and low temperatures; in Stephanella hina, the colony was said to be capable of germination for as long as four and a half years. *Some of the terminology that mentions "Stephanella hina" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…1年中群体が見られる種類もあるが,秋に群体が壊れ,走根の一部が残って越冬し,春になるとそれが個虫を出芽して群体をつくるものもある。淡水産のコケムシでは休芽をつくって冬を越すのがふつうであるが,ヒナコケムシStephanella hinaのように冬に群体が成育し,春になると休芽をつくって群体が消滅するものもある。休芽は胃と体壁とを結ぶ胃緒の中で無性的につくられ,乾燥や低温に耐えることができ,ヒメテンコケムシでは4年半も発芽能力をもっていたといわれる。… ※「Stephanella hina」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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