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Article: Experimental dietary manipulations and concurrent use of assimilation-based analyses for elucidation of consumer-resource relationships in tropical streams

TitleExperimental dietary manipulations and concurrent use of assimilation-based analyses for elucidation of consumer-resource relationships in tropical streams
Authors
KeywordsCarbon:nitrogen ratio
Cyanobacteria
Diatoms
Gastropod
Hong Kong
Issue Date2008
PublisherCSIRO Publishing. The Journal's web site is located at http://www.publish.csiro.au/journals/mfr/
Citation
Marine And Freshwater Research, 2008, v. 59 n. 11, p. 963-970 How to Cite?
AbstractThe relative contribution of autochthonous foods to consumer biomass in small tropical streams is unknown, but extrapolation of findings from temperate forest streams, where food webs are based on allochthonous resources, might be misleading. Experimental dietary manipulations were conducted to investigate the food used by the snail Brotia hainanensis (Pachychilidae), a generalist primary consumer common in Hong Kong streams, through the concurrent use of stoichiometry, stable isotope analysis (SIA) and fatty acid (FA) profiling. Juvenile B. hainanensis collected from the field were cultured under laboratory conditions and fed with conditioned leaf litter, periphyton or commercial fish-food flakes for 6 months and then compared with field-collected snails at the end of the trial. The results of the SIA and FA profiling showed that snails depended primarily on algal food. Prolonged feeding with leaf litter put B. hainanensis under elemental constraints and litter-fed snails deviated from strict stoichiometric homeostasis. Periphyton-fed, flake-fed and field-collected snails contained more total lipids and autochthonous FA biomarkers than litter-fed snails. The concurrent application of assimilation-based analyses allowed effective and accurate elucidation of consumer-resource relationships and, in the present study, confirmed the importance of autochthonous energy in a tropical stream food web. This approach will be useful for investigating complex trophic interactions. © CSIRO 2008.
Persistent Identifierhttp://hdl.handle.net/10722/60691
ISSN
2015 Impact Factor: 1.583
2015 SCImago Journal Rankings: 0.821
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council of the Hong Kong Special Administrative Region, China(HKU) 7619/05M
postgraduate studentship award
Funding Information:

We sincerely thank Ms Lily Ng, Ms Jessie Lai and Ms Alice Chan for their technical support on the chemical analyses. The work described in this paper was partially supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. (HKU) 7619/05M) and by a postgraduate studentship awarded to D. C. P. Lau. We thank Dr Timothy Moulton and an anonymous referee for suggestions that helped to improve an earlier version of this manuscript.

References

 

DC FieldValueLanguage
dc.contributor.authorLau, DCPen_HK
dc.contributor.authorLeung, KMYen_HK
dc.contributor.authorDudgeon, Den_HK
dc.date.accessioned2010-05-31T04:16:35Z-
dc.date.available2010-05-31T04:16:35Z-
dc.date.issued2008en_HK
dc.identifier.citationMarine And Freshwater Research, 2008, v. 59 n. 11, p. 963-970en_HK
dc.identifier.issn1323-1650en_HK
dc.identifier.urihttp://hdl.handle.net/10722/60691-
dc.description.abstractThe relative contribution of autochthonous foods to consumer biomass in small tropical streams is unknown, but extrapolation of findings from temperate forest streams, where food webs are based on allochthonous resources, might be misleading. Experimental dietary manipulations were conducted to investigate the food used by the snail Brotia hainanensis (Pachychilidae), a generalist primary consumer common in Hong Kong streams, through the concurrent use of stoichiometry, stable isotope analysis (SIA) and fatty acid (FA) profiling. Juvenile B. hainanensis collected from the field were cultured under laboratory conditions and fed with conditioned leaf litter, periphyton or commercial fish-food flakes for 6 months and then compared with field-collected snails at the end of the trial. The results of the SIA and FA profiling showed that snails depended primarily on algal food. Prolonged feeding with leaf litter put B. hainanensis under elemental constraints and litter-fed snails deviated from strict stoichiometric homeostasis. Periphyton-fed, flake-fed and field-collected snails contained more total lipids and autochthonous FA biomarkers than litter-fed snails. The concurrent application of assimilation-based analyses allowed effective and accurate elucidation of consumer-resource relationships and, in the present study, confirmed the importance of autochthonous energy in a tropical stream food web. This approach will be useful for investigating complex trophic interactions. © CSIRO 2008.en_HK
dc.languageengen_HK
dc.publisherCSIRO Publishing. The Journal's web site is located at http://www.publish.csiro.au/journals/mfr/en_HK
dc.relation.ispartofMarine and Freshwater Researchen_HK
dc.subjectCarbon:nitrogen ratioen_HK
dc.subjectCyanobacteriaen_HK
dc.subjectDiatomsen_HK
dc.subjectGastropoden_HK
dc.subjectHong Kongen_HK
dc.titleExperimental dietary manipulations and concurrent use of assimilation-based analyses for elucidation of consumer-resource relationships in tropical streamsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1323-1650&volume=59&spage=963&epage=970&date=2008&atitle=Experimental+dietary+manipulations+and+concurrent+use+of+assimilation-based+analyses+for+elucidation+of+consumer-resource+relationships+in+tropical+streams+en_HK
dc.identifier.emailLeung, KMY: kmyleung@hku.hken_HK
dc.identifier.emailDudgeon, D: ddudgeon@hku.hken_HK
dc.identifier.authorityLeung, KMY=rp00733en_HK
dc.identifier.authorityDudgeon, D=rp00691en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1071/MF07213en_HK
dc.identifier.scopuseid_2-s2.0-57049159920en_HK
dc.identifier.hkuros154258en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-57049159920&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume59en_HK
dc.identifier.issue11en_HK
dc.identifier.spage963en_HK
dc.identifier.epage970en_HK
dc.identifier.isiWOS:000261175400002-
dc.publisher.placeAustraliaen_HK
dc.identifier.scopusauthoridLau, DCP=23089080800en_HK
dc.identifier.scopusauthoridLeung, KMY=7401860738en_HK
dc.identifier.scopusauthoridDudgeon, D=7006559840en_HK

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