...Later, it was discovered that this was a secretion from a single-celled, planktonic algae called Coccolithophorida, which belongs to the haptophyte family and is a member of a group collectively known as calcareous nannoplankton. There are more than 150 species of extant Coccolithophorida, including Coccolithus pelagicus , and with the exception of a few species, they photosynthesize and reproduce in the photic zone, which occupies the surface layer of about 150 meters of ocean water other than the Arctic and Antarctic Oceans. The density in seawater varies depending on the water area and season, but tens or hundreds of thousands of cells per liter are normal, and there have been records of 13 million cells in the fjords of Oslo. ... *Some of the terminology that mentions "Coccolithus" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…後に,これは石灰質ナンノプランクトンと総称されるグループの一員で,コッコリトフォリーダCoccolithophoridaと呼ばれる,ハプト藻類に属する単細胞の浮遊性藻類の分泌したものであることが判明した。現生のコッコリトフォリーダはCoccolithus pelagicusなど150種以上に達するが,少数種を除き,北極海および南極海以外の大洋水の表層約150mを占める透光帯において光合成を営み,繁殖している。海水中での密度は水域や季節により変化するが,1l当り数万ないし数十万個が普通で,オスロのフィヨルドのように1300万個という記録もある。… ※「Coccolithus」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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