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Article: Evidence of rapid shifts in the trophic base of lotic predators using experimental dietary manipulations and assimilation-based analyses

TitleEvidence of rapid shifts in the trophic base of lotic predators using experimental dietary manipulations and assimilation-based analyses
Authors
Issue Date2009
PublisherSpringer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00442/index.htm
Citation
Oecologia, 2009, v. 159 n. 4, p. 767-776 How to Cite?
AbstractAssimilation-based techniques such as stoichiometric analysis, bulk tissue stable isotope analysis (SIA), fatty acid (FA) profiling and compound-specific SIA of FAs can be used to resolve ambiguities in consumer-resource relationships, but comparisons of their effectiveness are lacking. Feeding trials and concurrent application of these techniques were used to investigate the trophic base of two shrimps from Hong Kong streams: the atyid Caridina cantonensis, which is a primary consumer, and predatory Macrobrachium hainanense (Palaemonidae). Leaf litter and periphyton were fed to C. cantonensis (CC-LF and CC-PF, respectively) reared in the laboratory for 2 months, when C. cantonensis, that had fed on a mixed diet (CC-WC), were collected from the field. Atyids from each group (CC-LF, CC-PF and CC-WC) were fed to M. hainanense (MH-L, MH-P and MH-W, respectively) during a further 2-month trial, at the end of which M. hainanense were also collected from the field (MH-R). FA biomarkers present in CC-WC and CC-PF indicated that C. cantonensis depended primarily on autochthonous foods, and FA profiles of CC-WC were distinct from those of CC-LF. Differences in C/N ratios and isotope signatures of leaf litter and periphyton were not reflected in tissues of atyids or palaemonid predators. FA profiles of M. hainanense groups were similar, but FA stable C isotope ratio (δ13C) signatures of MH-R and MH-W were distinct from those of MH-L and leaf litter. FA δ13C signatures of MH-R were similar to those of MH-P and MH-W, indicating that autochthonous resources constituted the trophic base of production for this predator. This is the first study using compound-specific SIA to study stream food chains. Compound-specific SIA and FA profiling allowed accurate elucidation of consumer-resource relationships that were not revealed by stoichiometry or bulk tissue SIA. Compound-specific SIA was particularly sensitive for detecting rapid shifts in the predator trophic base. This tool will have wide applicability for investigating food webs in a range of ecosystems. © 2008 Springer-Verlag.
Persistent Identifierhttp://hdl.handle.net/10722/60640
ISSN
2015 Impact Factor: 2.902
2015 SCImago Journal Rankings: 1.985
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLau, DCPen_HK
dc.contributor.authorLeung, KMYen_HK
dc.contributor.authorDudgeon, Den_HK
dc.date.accessioned2010-05-31T04:15:39Z-
dc.date.available2010-05-31T04:15:39Z-
dc.date.issued2009en_HK
dc.identifier.citationOecologia, 2009, v. 159 n. 4, p. 767-776en_HK
dc.identifier.issn0029-8549en_HK
dc.identifier.urihttp://hdl.handle.net/10722/60640-
dc.description.abstractAssimilation-based techniques such as stoichiometric analysis, bulk tissue stable isotope analysis (SIA), fatty acid (FA) profiling and compound-specific SIA of FAs can be used to resolve ambiguities in consumer-resource relationships, but comparisons of their effectiveness are lacking. Feeding trials and concurrent application of these techniques were used to investigate the trophic base of two shrimps from Hong Kong streams: the atyid Caridina cantonensis, which is a primary consumer, and predatory Macrobrachium hainanense (Palaemonidae). Leaf litter and periphyton were fed to C. cantonensis (CC-LF and CC-PF, respectively) reared in the laboratory for 2 months, when C. cantonensis, that had fed on a mixed diet (CC-WC), were collected from the field. Atyids from each group (CC-LF, CC-PF and CC-WC) were fed to M. hainanense (MH-L, MH-P and MH-W, respectively) during a further 2-month trial, at the end of which M. hainanense were also collected from the field (MH-R). FA biomarkers present in CC-WC and CC-PF indicated that C. cantonensis depended primarily on autochthonous foods, and FA profiles of CC-WC were distinct from those of CC-LF. Differences in C/N ratios and isotope signatures of leaf litter and periphyton were not reflected in tissues of atyids or palaemonid predators. FA profiles of M. hainanense groups were similar, but FA stable C isotope ratio (δ13C) signatures of MH-R and MH-W were distinct from those of MH-L and leaf litter. FA δ13C signatures of MH-R were similar to those of MH-P and MH-W, indicating that autochthonous resources constituted the trophic base of production for this predator. This is the first study using compound-specific SIA to study stream food chains. Compound-specific SIA and FA profiling allowed accurate elucidation of consumer-resource relationships that were not revealed by stoichiometry or bulk tissue SIA. Compound-specific SIA was particularly sensitive for detecting rapid shifts in the predator trophic base. This tool will have wide applicability for investigating food webs in a range of ecosystems. © 2008 Springer-Verlag.en_HK
dc.languageengen_HK
dc.publisherSpringer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00442/index.htmen_HK
dc.relation.ispartofOecologiaen_HK
dc.subject.meshAnalysis of Varianceen_HK
dc.subject.meshAnimal Nutritional Physiological Phenomena - physiologyen_HK
dc.subject.meshAnimalsen_HK
dc.subject.meshCarbon Isotopes - analysisen_HK
dc.subject.meshChromatography, Gasen_HK
dc.subject.meshDecapoda (Crustacea) - physiologyen_HK
dc.subject.meshFatty Acids - analysisen_HK
dc.subject.meshFeeding Behavior - physiologyen_HK
dc.subject.meshFood Chainen_HK
dc.subject.meshHong Kongen_HK
dc.subject.meshMethyl Ethers - analysisen_HK
dc.subject.meshNitrogen - analysisen_HK
dc.titleEvidence of rapid shifts in the trophic base of lotic predators using experimental dietary manipulations and assimilation-based analysesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0029-8549&volume=159&spage=767&epage=776&date=2009&atitle=Evidence+of+rapid+shifts+in+the+trophic+base+of+lotic+predators+using+experimental+dietary+manipulations+and+assimilation-based+analysesen_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.doi10.1007/s00442-008-1262-0en_HK
dc.identifier.pmid19132399-
dc.identifier.scopuseid_2-s2.0-62149135886en_HK
dc.identifier.hkuros155373en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-62149135886&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume159en_HK
dc.identifier.issue4en_HK
dc.identifier.spage767en_HK
dc.identifier.epage776en_HK
dc.identifier.isiWOS:000264103800009-
dc.publisher.placeGermanyen_HK
dc.identifier.scopusauthoridLau, DCP=23089080800en_HK
dc.identifier.scopusauthoridLeung, KMY=7401860738en_HK
dc.identifier.scopusauthoridDudgeon, D=7006559840en_HK
dc.identifier.citeulike3897057-

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