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Article: The source and fate of organic matter and the significance of detrital pathways in a tropical coastal ecosystem

TitleThe source and fate of organic matter and the significance of detrital pathways in a tropical coastal ecosystem
Authors
Issue Date2008
PublisherAmerican Society of Limnology and Oceanography, Inc. The Journal's web site is located at http://aslo.org/lo/
Citation
Limnology And Oceanography, 2008, v. 53 n. 4, p. 1479-1492 How to Cite?
AbstractStable isotope analysis (SIA) and fatty acid profiling were used to elucidate the supply and fate of energy in a tropical coastal ecosystem in Hong Kong, southern China. To investigate seasonal changes in source supply on the diets of different trophic guilds, measurements were taken in three rocky bays before and after the onset of the summer monsoon, when supply of both marine macroalgal and streamborne terrestrial detritus increases. Particulate organic matter, comprising a mixture of marine and terrestrial sources, was the ultimate food source (>60%) for suspension feeders, which were the major prey items of a predatory gastropod (Thais). Increased levels of bacterial fatty acid biomarkers (BaFA) were recorded after the onset of the summer monsoon, indicating amplified dependence on detrital materials in both primary and secondary consumers. The considerable increase in the detritus fraction of sedimentary organic matter at the onset of the summer monsoon was reflected by enhanced levels of BaFA, possibly due to the degeneration of macroalgae. Significant contributions of this marine algal detritus to deposit feeders (Holothuria, 36%) and of terrestrial detritus to an echinoid grazer (Salmacis, 14%) were revealed by SIA mixing models as well as elevated BaFA concentrations. These results indicate a higher dependence on heterotrophic food chains based on decomposing marine algae and terrestrial detritus after the onset of the summer monsoon. Such seasonal variation in the importance of detrital energy sources is, therefore, likely to be important to coastal ecosystem functioning in the monsoonal tropics. © 2008, by the American Society of Limnology and Oceanography, Inc.
Persistent Identifierhttp://hdl.handle.net/10722/89248
ISSN
2015 Impact Factor: 3.66
2015 SCImago Journal Rankings: 2.485
References

 

DC FieldValueLanguage
dc.contributor.authorWai, TCen_HK
dc.contributor.authorNg, JSSen_HK
dc.contributor.authorLeung, KMYen_HK
dc.contributor.authorDudgeon, Den_HK
dc.contributor.authorWilliams, GAen_HK
dc.date.accessioned2010-09-06T09:54:26Z-
dc.date.available2010-09-06T09:54:26Z-
dc.date.issued2008en_HK
dc.identifier.citationLimnology And Oceanography, 2008, v. 53 n. 4, p. 1479-1492en_HK
dc.identifier.issn0024-3590en_HK
dc.identifier.urihttp://hdl.handle.net/10722/89248-
dc.description.abstractStable isotope analysis (SIA) and fatty acid profiling were used to elucidate the supply and fate of energy in a tropical coastal ecosystem in Hong Kong, southern China. To investigate seasonal changes in source supply on the diets of different trophic guilds, measurements were taken in three rocky bays before and after the onset of the summer monsoon, when supply of both marine macroalgal and streamborne terrestrial detritus increases. Particulate organic matter, comprising a mixture of marine and terrestrial sources, was the ultimate food source (>60%) for suspension feeders, which were the major prey items of a predatory gastropod (Thais). Increased levels of bacterial fatty acid biomarkers (BaFA) were recorded after the onset of the summer monsoon, indicating amplified dependence on detrital materials in both primary and secondary consumers. The considerable increase in the detritus fraction of sedimentary organic matter at the onset of the summer monsoon was reflected by enhanced levels of BaFA, possibly due to the degeneration of macroalgae. Significant contributions of this marine algal detritus to deposit feeders (Holothuria, 36%) and of terrestrial detritus to an echinoid grazer (Salmacis, 14%) were revealed by SIA mixing models as well as elevated BaFA concentrations. These results indicate a higher dependence on heterotrophic food chains based on decomposing marine algae and terrestrial detritus after the onset of the summer monsoon. Such seasonal variation in the importance of detrital energy sources is, therefore, likely to be important to coastal ecosystem functioning in the monsoonal tropics. © 2008, by the American Society of Limnology and Oceanography, Inc.en_HK
dc.languageengen_HK
dc.publisherAmerican Society of Limnology and Oceanography, Inc. The Journal's web site is located at http://aslo.org/lo/en_HK
dc.relation.ispartofLimnology and Oceanographyen_HK
dc.titleThe source and fate of organic matter and the significance of detrital pathways in a tropical coastal ecosystemen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0024-3590&volume=53&spage=1479&epage=1492&date=2008&atitle=The+source+and+fate+of+organic+matter+and+the+significance+of+detrital+pathways+in+a+tropical+coastal+ecosystemen_HK
dc.identifier.emailWai, TC: waitc@hkucc.hku.hken_HK
dc.identifier.emailLeung, KMY: kmyleung@hku.hken_HK
dc.identifier.emailDudgeon, D: ddudgeon@hku.hken_HK
dc.identifier.emailWilliams, GA: hrsbwga@hkucc.hku.hken_HK
dc.identifier.authorityWai, TC=rp00797en_HK
dc.identifier.authorityLeung, KMY=rp00733en_HK
dc.identifier.authorityDudgeon, D=rp00691en_HK
dc.identifier.authorityWilliams, GA=rp00804en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-47349126795en_HK
dc.identifier.hkuros145429en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-47349126795&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume53en_HK
dc.identifier.issue4en_HK
dc.identifier.spage1479en_HK
dc.identifier.epage1492en_HK
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridWai, TC=15039017100en_HK
dc.identifier.scopusauthoridNg, JSS=14833146600en_HK
dc.identifier.scopusauthoridLeung, KMY=7401860738en_HK
dc.identifier.scopusauthoridDudgeon, D=7006559840en_HK
dc.identifier.scopusauthoridWilliams, GA=7406082821en_HK

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