Phytoplankton Species in Hong Kong Coastal Waters

330 Chlamydomonas 衣藻 Phylum: Chlorophyta 门:綠藻門 Class: Chlorophyceae 纲:綠藻綱 Order: Chlamydomonadales 目:衣藻目 Family: Chlamydomonadaceae 科:衣藻科 Morphology Cells are solitary, motile, and varied from spherical, elliptical, oval, to broad spindleshaped. Two flagella with equal length arise apically. Chloroplasts are large, cup or bowlshaped, H-shaped or star-like. Cells will be immotile in unfavorable living conditions and embedded by thick mucilage sheath after serveral divisions. Cells with flagella will get out of sheath in good living conditions. According to AlgaeBase, there are 544 species in genus Chlamydomonas which are difficult to identify based on light microscopic observation. Most of Chlamydomonas species are terrestrial and only limited number of Chlamydomonas species are marine. 形態 細胞獨立生活,可以遊動,一般球形,橢圓形,卵形或寬紡錘形等。細胞前端有兩 條等長的鞭毛。色素體較大,杯狀,杯狀, “H”形或星狀等。具澱粉核。當生活條 件不利的時候細胞停止遊動,並多次分裂形成厚的膠質鞘包裹的臨時群體。生存條 件好轉後細胞產生鞭毛破鞘而出。基於AlgaeBase,衣藻屬目前有544個物種,僅 基於光學顯微鏡很難鑒定。絕大多數衣藻為陸生,海洋衣藻數量較少。 Ecology and distribution Marine Chlamydomonas species are mainly found in estuarine and coastal waters based on limited studies.

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