The Diet of the Mud Clam Geloina Coaxans (Mollusca, Bivalvia) as Indicated by Fatty Acid Markers in a Subtropical Mangrove Forest of Okinawa, Japan

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dc.contributor.authorBachok, Zainudin
dc.contributor.authorMfilinge, Prosper L.
dc.contributor.authorTsuchiya, Makoto
dc.date.accessioned2016-07-08T12:29:05Z
dc.date.available2016-07-08T12:29:05Z
dc.date.issued2003
dc.description.abstractFatty acid compositions in the tissues of the clam Geloina coaxans collected from Oura mangal, Okinawa, Japan, during the cold and warm seasons (January and July 2001, respectively) were compared with those in suspended materials (SM) in order to assess the clams' diet. In both seasons, the suspended mangrove detritus at the sediment–water interface was high as indicated by the mean percentage of even-numbered long-chain fatty acids in SM (12.8–18.4%). The contribution of this marker in the clam tissues, especially during the cold season (3.9%), indicates the consumption of mangrove detritus in considerable amounts by the clams. The occurrence of the fatty acids 16:1ω7, 18:1ω9, 18:2ω6 and 18:3ω3 in SM was most likely due to the mangrove detritus sources, whereas in the SM they together constituted 12.9% and 23.9% of total fatty acid contents during the cold and warm seasons, respectively. As a result, their contribution in the clam tissues was high in the cold (15.4%) and warm seasons (19.0%). These results indicate that mangrove detritus play a significant role in the clams' diet. The mean percentages of bacterial markers (odd-numbered branched fatty acids and vaccenic acid, 18:1ω7) in the SM and tissues during both seasons ranged from 8.1% to 9.5%. This indicates that the clam diet is also dependent on the attached bacteria on the partially decomposed leaf detritus suspended at the sediment–water interface. The relative contribution by microalgae markers (18:4ω3, 20:5ω3 and 22:6ω3) in clam tissues ranged from 4.3% to 7.6%, suggesting considerable microalgae sources in the diets.en_US
dc.identifier.citationBachok, Z., Mfilinge, P.L. and Tsuchiya, M., 2003. The diet of the mud clam Geloina coaxans (Mollusca, Bivalvia) as indicated by fatty acid markers in a subtropical mangrove forest of Okinawa, Japan. Journal of Experimental Marine Biology and Ecology, 292(2), pp.187-197.en_US
dc.identifier.doi10.1016/S0022-0981(03)00160-6
dc.identifier.urihttp://hdl.handle.net/20.500.11810/2924
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.subjectBivalveen_US
dc.subjectDieten_US
dc.subjectFatty acid markersen_US
dc.subjectGeloina coaxansen_US
dc.subjectMangroveen_US
dc.titleThe Diet of the Mud Clam Geloina Coaxans (Mollusca, Bivalvia) as Indicated by Fatty Acid Markers in a Subtropical Mangrove Forest of Okinawa, Japanen_US
dc.typeJournal Article, Peer Revieweden_US
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