306 Trichodesmium erythraeum 紅海束毛藻 Phylum: Cyanobacteria 门：藍藻門 Class: Cyanophyceae 纲：藍藻綱 Order: Oscillatoriales 目：顫藻目 Family: Microcoleaceae 科：微孔藻科 Morphology Trichodesmium erythraeum is filamentous alga with straight trichomes parallel or radially arranged fascicles joined by mucilage. Intercalary cells are cylindrical, equal in size, with heights shorter than widths. Terminal cells are relatively smaller than intercalary cells. 形態 紅海束毛藻呈絲狀，藻絲直，由膠質相連平行或輻射排列成束狀結構。藻絲內細胞 圓柱形，大小一致，一般高小於寬，末端細胞較小。 Ecology and distribution Trichodesmium erythraeum is cosmopolitan species in warm tropical and subtropical waters. It is the major and most dominant N2-fixing planktonic organism (diazotroph) in tropical and subtropical seas, playing key roles in global biogeochemical cycles. Trichodesmium erythraeum is bloom forming species and has caused 13 blooms in Hong Kong coastal waters from 1984 to 2023. Trichodesmium erythraeum is capable to produce toxins inluding saxitoxin, and microcystins that might be associated with mortality of fish and shellfish (Negri et al., 2004; Ramos et al., 2005; Narayana et al., 2014) 生態與分佈 紅海束毛藻廣泛分佈於溫帶和熱帶海域。該物種是熱帶、亞熱帶海域最主要最具優 勢的固氮生物，在全球生物地球化學迴圈中起到了關鍵的作用。紅海束毛藻是紅潮
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