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Article: Are autochthonous foods more important than allochthonous resources to benthic consumers in tropical headwater streams?

TitleAre autochthonous foods more important than allochthonous resources to benthic consumers in tropical headwater streams?
Authors
KeywordsEnergy Flow
Fatty Acids
Food Web
Stable Isotopes
Stoichiometry
Trophic Level
Issue Date2009
PublisherNorth American Benthological Society. The Journal's web site is located at http://www.benthos.org
Citation
Journal Of The North American Benthological Society, 2009, v. 28 n. 2, p. 426-439 How to Cite?
AbstractIncreasing evidence suggests that autochthonous foods are the principal basis of consumer production in tropical forest streams, despite the predominance of terrestrial detritus inputs. The relative importance of autochthonous and allochthonous energy for the dominant benthic consumers was investigated in 3 tropical headwater streams with different shading conditions in Hong Kong with a combination of assimilation-based analyses: stoichiometry, C and N stable isotopes, and fatty acid (FA) profiling. The snail Brotia hainanensis (Pachychilidae), shrimps Caridina cantonensis (Atyidae) and Macrobrachium hainanense (Palaemonidae), and their potential basal food sources (leaf litter, fine particulate organic matter [FPOM], periphyton, cyanobacteria, and filamentous algae) were collected in Tai Po Kau Forest Stream (shaded 1), Shing Mun Stream (shaded 2), and Pak Ngau Shek Stream (open) during the 2004 dry season (January and February). All samples were analyzed for C:N ratios, δ13C, and δ15N values. Total FAs were extracted from each sample, and concentrations of 35 important FAs were analyzed by gas chromatography-mass spectrometry (GC-MS). C:N ratios of algal foods were markedly lower than those of terrestrial detritus and similar to those of the test animals at all 3 sites, a result that suggested that autochthonous sources were relatively more nutritious than were allochthonous sources. Autochthonous foods were more 13C and 15N enriched than were allochthonous foods at all sites. The algal sources contributed to 29 to 98% of consumer biomass, generally more than was attributed to the terrestrial sources (2-71%). Consumers also showed distinctive FA profiles indicating consumption of autochthonous foods, especially periphytic diatoms and cyanobacteria, as revealed by the elevated concentrations of FA biomarkers such as palmitoleic (16:l[cis-9]) and eicosapentaenoic acids (20:5[all c/s-5, 8, 11, 14, 17]) in the consumers, periphyton, and cyanobacteria. Our results suggest that autochthonous resources are possibly more important than allochthonous foods to secondary production in tropical headwater streams. © 2009 by The North American Benthological Society.
Persistent Identifierhttp://hdl.handle.net/10722/179119
ISSN
2013 Impact Factor: 2.706
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLau, DCPen_US
dc.contributor.authorLeung, KMYen_US
dc.contributor.authorDudgeon, Den_US
dc.date.accessioned2012-12-19T09:52:07Z-
dc.date.available2012-12-19T09:52:07Z-
dc.date.issued2009en_US
dc.identifier.citationJournal Of The North American Benthological Society, 2009, v. 28 n. 2, p. 426-439en_US
dc.identifier.issn0887-3593en_US
dc.identifier.urihttp://hdl.handle.net/10722/179119-
dc.description.abstractIncreasing evidence suggests that autochthonous foods are the principal basis of consumer production in tropical forest streams, despite the predominance of terrestrial detritus inputs. The relative importance of autochthonous and allochthonous energy for the dominant benthic consumers was investigated in 3 tropical headwater streams with different shading conditions in Hong Kong with a combination of assimilation-based analyses: stoichiometry, C and N stable isotopes, and fatty acid (FA) profiling. The snail Brotia hainanensis (Pachychilidae), shrimps Caridina cantonensis (Atyidae) and Macrobrachium hainanense (Palaemonidae), and their potential basal food sources (leaf litter, fine particulate organic matter [FPOM], periphyton, cyanobacteria, and filamentous algae) were collected in Tai Po Kau Forest Stream (shaded 1), Shing Mun Stream (shaded 2), and Pak Ngau Shek Stream (open) during the 2004 dry season (January and February). All samples were analyzed for C:N ratios, δ13C, and δ15N values. Total FAs were extracted from each sample, and concentrations of 35 important FAs were analyzed by gas chromatography-mass spectrometry (GC-MS). C:N ratios of algal foods were markedly lower than those of terrestrial detritus and similar to those of the test animals at all 3 sites, a result that suggested that autochthonous sources were relatively more nutritious than were allochthonous sources. Autochthonous foods were more 13C and 15N enriched than were allochthonous foods at all sites. The algal sources contributed to 29 to 98% of consumer biomass, generally more than was attributed to the terrestrial sources (2-71%). Consumers also showed distinctive FA profiles indicating consumption of autochthonous foods, especially periphytic diatoms and cyanobacteria, as revealed by the elevated concentrations of FA biomarkers such as palmitoleic (16:l[cis-9]) and eicosapentaenoic acids (20:5[all c/s-5, 8, 11, 14, 17]) in the consumers, periphyton, and cyanobacteria. Our results suggest that autochthonous resources are possibly more important than allochthonous foods to secondary production in tropical headwater streams. © 2009 by The North American Benthological Society.en_US
dc.languageengen_US
dc.publisherNorth American Benthological Society. The Journal's web site is located at http://www.benthos.orgen_US
dc.relation.ispartofJournal of the North American Benthological Societyen_US
dc.subjectEnergy Flowen_US
dc.subjectFatty Acidsen_US
dc.subjectFood Weben_US
dc.subjectStable Isotopesen_US
dc.subjectStoichiometryen_US
dc.subjectTrophic Levelen_US
dc.titleAre autochthonous foods more important than allochthonous resources to benthic consumers in tropical headwater streams?en_US
dc.typeArticleen_US
dc.identifier.emailLeung, KMY: kmyleung@hku.hken_US
dc.identifier.emailDudgeon, D: ddudgeon@hku.hken_US
dc.identifier.authorityLeung, KMY=rp00733en_US
dc.identifier.authorityDudgeon, D=rp00691en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1899/07-079.1en_US
dc.identifier.scopuseid_2-s2.0-62149150049en_US
dc.identifier.hkuros155924-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-62149150049&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume28en_US
dc.identifier.issue2en_US
dc.identifier.spage426en_US
dc.identifier.epage439en_US
dc.identifier.isiWOS:000266645700015-
dc.publisher.placeCanadaen_US
dc.identifier.scopusauthoridLau, DCP=23089080800en_US
dc.identifier.scopusauthoridLeung, KMY=7401860738en_US
dc.identifier.scopusauthoridDudgeon, D=7006559840en_US

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