File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Experimental dietary manipulations for determining the relative importance of allochthonous and autochthonous food resources in tropical streams

TitleExperimental dietary manipulations for determining the relative importance of allochthonous and autochthonous food resources in tropical streams
Authors
KeywordsAllochthonous
Autochthonous
Fatty acids
Stable isotopes
Stoichiometry
Issue Date2008
PublisherBlackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/FWB
Citation
Freshwater Biology, 2008, v. 53 n. 1, p. 139-147 How to Cite?
Abstract1. Autochthonous sources of organic matter appear to make a minor contribution to food webs in temperate forest streams, but their roles in supporting consumer biomass in tropical lotic environments have received little attention. We investigated the importance of autochthonous and allochthonous food sources to Brotia hainanensis (Pachychilidae), a detritivorous and algivorous snail common in Hong Kong hillstreams, using experimental dietary manipulations and assimilation-based analyses, including stoichiometry, carbon (C) and nitrogen (N) stable isotopes and fatty acid (FA) profiles. 2. Juvenile B. hainanensis collected in Pak Ngau Shek Stream were cultured under controlled laboratory conditions and fed for 2 months with either conditioned Liquidambar formosana (Hamamelidaceae) leaf litter or periphyton. Samples of B. hainanensis were also collected from the stream at the end of the experiment for comparison with snails reared in the laboratory. 3. Periphyton and leaf litter exhibited marked differences in C/N ratios, δ13C and δ 15N values and FA profiles. Stable isotope analysis and FA profiling of laboratory-reared and field-collected B. hainanensis both confirmed that snails relied primarily on autochthonous foods, especially periphytic diatoms and cyanobacteria. Stoichiometry results indicated that periphyton was a more nutritious food (with lower C/N ratio) than leaf litter. 4. This is the first study demonstrating that the combined use of stable isotopes and FA profiles is an effective diagnostic tool to trace the basal food sources of consumers in natural stream habitats. Our findings further support the hypothesis that primary production in tropical streams is generally more important to aquatic consumers than inputs of terrestrial detritus. © 2007 The Authors.
Persistent Identifierhttp://hdl.handle.net/10722/89288
ISSN
2015 Impact Factor: 2.933
2015 SCImago Journal Rankings: 1.574
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLau, DCPen_HK
dc.contributor.authorLeung, KMYen_HK
dc.contributor.authorDudgeon, Den_HK
dc.date.accessioned2010-09-06T09:54:58Z-
dc.date.available2010-09-06T09:54:58Z-
dc.date.issued2008en_HK
dc.identifier.citationFreshwater Biology, 2008, v. 53 n. 1, p. 139-147en_HK
dc.identifier.issn0046-5070en_HK
dc.identifier.urihttp://hdl.handle.net/10722/89288-
dc.description.abstract1. Autochthonous sources of organic matter appear to make a minor contribution to food webs in temperate forest streams, but their roles in supporting consumer biomass in tropical lotic environments have received little attention. We investigated the importance of autochthonous and allochthonous food sources to Brotia hainanensis (Pachychilidae), a detritivorous and algivorous snail common in Hong Kong hillstreams, using experimental dietary manipulations and assimilation-based analyses, including stoichiometry, carbon (C) and nitrogen (N) stable isotopes and fatty acid (FA) profiles. 2. Juvenile B. hainanensis collected in Pak Ngau Shek Stream were cultured under controlled laboratory conditions and fed for 2 months with either conditioned Liquidambar formosana (Hamamelidaceae) leaf litter or periphyton. Samples of B. hainanensis were also collected from the stream at the end of the experiment for comparison with snails reared in the laboratory. 3. Periphyton and leaf litter exhibited marked differences in C/N ratios, δ13C and δ 15N values and FA profiles. Stable isotope analysis and FA profiling of laboratory-reared and field-collected B. hainanensis both confirmed that snails relied primarily on autochthonous foods, especially periphytic diatoms and cyanobacteria. Stoichiometry results indicated that periphyton was a more nutritious food (with lower C/N ratio) than leaf litter. 4. This is the first study demonstrating that the combined use of stable isotopes and FA profiles is an effective diagnostic tool to trace the basal food sources of consumers in natural stream habitats. Our findings further support the hypothesis that primary production in tropical streams is generally more important to aquatic consumers than inputs of terrestrial detritus. © 2007 The Authors.en_HK
dc.languageengen_HK
dc.publisherBlackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/FWBen_HK
dc.relation.ispartofFreshwater Biologyen_HK
dc.rightsFreshwater Biology. Copyright © Blackwell Publishing Ltd.en_HK
dc.subjectAllochthonousen_HK
dc.subjectAutochthonousen_HK
dc.subjectFatty acidsen_HK
dc.subjectStable isotopesen_HK
dc.subjectStoichiometryen_HK
dc.titleExperimental dietary manipulations for determining the relative importance of allochthonous and autochthonous food resources in tropical streamsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0046-5070&volume=53&spage=139&epage=147&date=2008&atitle=Experimental+dietary+manipulations+for+determining+the+relative+importance+of+allochthonous+and+autochthonous+food+resources+in+tropical+streamsen_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.doi10.1111/j.1365-2427.2007.01873.xen_HK
dc.identifier.scopuseid_2-s2.0-37149015693en_HK
dc.identifier.hkuros140379en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-37149015693&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume53en_HK
dc.identifier.issue1en_HK
dc.identifier.spage139en_HK
dc.identifier.epage147en_HK
dc.identifier.isiWOS:000251629900011-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridLau, DCP=23089080800en_HK
dc.identifier.scopusauthoridLeung, KMY=7401860738en_HK
dc.identifier.scopusauthoridDudgeon, D=7006559840en_HK
dc.identifier.citeulike2126734-

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats