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Diversity of thraustochytrids from fallen senescent leaves of 11 mangrove trees collected from
Mangrove Resources Development Station 2 Tha Son, Chanthaburi Province were investigated. A total of 123
isolates of thraustochytrids were found which classified into 3 species, namely Aurantiochytrium mangrovei,
Aurantiochytrium limacinum and Aurantiochytrium sp. The frequency of occurrence of these thraustochytrids
were 5 – 40 % and A. mangrovei was the predominant species. This study also found 21 isolates (1 species)of Aplanochytrids (Aplanochytrium sp.) which is close to a group of thraustochytrids and expressed as 5 –
35 % of occurrence. Consider with the species of mangrove trees, the percentage of occurrence were rather
high in leaves of Avicennia alba, Acrostichum aureum and Xylocarpus moluccensis. The highest biomass
was found in Aurantiochytrium sp. BUCHA0101 (18.01 ± 3.36 g/L), whereas A. limacinum, A. mangrovei,
and Aplanochytrium sp. were quit similar amount (15.35 - 16.77 g/L). For fatty acid content analyzed by
Gas Chromatography 6890, docosahexaenoic acid (DHA) was found in a range of 138.82 - 182.08 mg/g dry
wt. (29.69 – 34.99 % of total fatty acids), while docosapentaenoic acid and arachidonic acid were found of
28.99 – 43.63 mg/g dry wt. (6.57 – 8.38 % of total fatty acids) and of 0.38 – 0.46 mg/g dry wt. (0.08 – 0.10 %
of total fatty acids), respectively.
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