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Article: Foodweb structure in a tropical Asian forest stream

TitleFoodweb structure in a tropical Asian forest stream
Authors
KeywordsAllochthonous
Autochthonous
China
Connectance
Foodchain length
Gut contents
Stable isotope signatures
Tai Po Kau Forest Stream
Issue Date2004
PublisherNorth American Benthological Society. The Journal's web site is located at http://www.benthos.org
Citation
Journal Of The North American Benthological Society, 2004, v. 23 n. 4, p. 728-755 How to Cite?
AbstractA food web based on the gut contents of consumers (invertebrates and fishes) in pools of Tai Po Kau Forest Stream (TPKFS), Hong Kong (southern China), indicated the importance of periphyton and fine organic particles; coarse particulate organic matter was a less important food source despite its higher relative abundance in this shaded hillstream. Stable isotope analysis of consumer tissues was undertaken to confirm this result. IsoSource software was used to model n-isotope and >n + 1-sources, so that the relative contribution of the potential food sources could be determined. Results of an IsoSource mixed model of δ15N and δ13C stable isotope signatures of primary consumers generally supported evidence from gut content analyses about the importance of autochthonous resources. Inconsistencies between the results of gut content analysis and isotope signatures of consumer tissues occurred in a few cases but could be explained either by small sample size or the wide range of feasible solutions provided by the isotopic mixed model. Both techniques were needed to resolve the trophic position of omnivores. For instance, the gut contents of balitorid loaches indicated that they were primarily herbivorous but their stable isotope signatures revealed a significant dependence on animal food. Considerable overlap in the diets of predatory fishes and invertebrates (odonates, perlid stoneflies, palaemonid shrimps) was confirmed by both gut contents and stable isotope analyses. This finding, along with a lack of intraguild predation, resulted in a short mean and maximum foodchain length, high links per species, and high connectance for the TPKFS food web when compared with literature reports of other stream food webs. Periods of spate-induced disturbance during the wet season and limited algal productivity in TPKFS might also have contributed to the short food chains. Inconsistent levels of resolution for different taxonomic groups within the food web may have generated artefacts of low linkage complexity, high predator-prey ratio, and a small number of basal and intermediate species, a pattern that has been confirmed for stream food webs elsewhere. Our study is the first example of a food web based on complementary analyses of gut contents and stable isotope signatures for any tropical stream. This combined approach is recommended for future studies of food webs, especially in habitats where omnivores are an important component of the community.
Persistent Identifierhttp://hdl.handle.net/10722/73277
ISSN
2013 Impact Factor: 2.706
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorMantel, SKen_HK
dc.contributor.authorSalas, Men_HK
dc.contributor.authorDudgeon, Den_HK
dc.date.accessioned2010-09-06T06:49:47Z-
dc.date.available2010-09-06T06:49:47Z-
dc.date.issued2004en_HK
dc.identifier.citationJournal Of The North American Benthological Society, 2004, v. 23 n. 4, p. 728-755en_HK
dc.identifier.issn0887-3593en_HK
dc.identifier.urihttp://hdl.handle.net/10722/73277-
dc.description.abstractA food web based on the gut contents of consumers (invertebrates and fishes) in pools of Tai Po Kau Forest Stream (TPKFS), Hong Kong (southern China), indicated the importance of periphyton and fine organic particles; coarse particulate organic matter was a less important food source despite its higher relative abundance in this shaded hillstream. Stable isotope analysis of consumer tissues was undertaken to confirm this result. IsoSource software was used to model n-isotope and >n + 1-sources, so that the relative contribution of the potential food sources could be determined. Results of an IsoSource mixed model of δ15N and δ13C stable isotope signatures of primary consumers generally supported evidence from gut content analyses about the importance of autochthonous resources. Inconsistencies between the results of gut content analysis and isotope signatures of consumer tissues occurred in a few cases but could be explained either by small sample size or the wide range of feasible solutions provided by the isotopic mixed model. Both techniques were needed to resolve the trophic position of omnivores. For instance, the gut contents of balitorid loaches indicated that they were primarily herbivorous but their stable isotope signatures revealed a significant dependence on animal food. Considerable overlap in the diets of predatory fishes and invertebrates (odonates, perlid stoneflies, palaemonid shrimps) was confirmed by both gut contents and stable isotope analyses. This finding, along with a lack of intraguild predation, resulted in a short mean and maximum foodchain length, high links per species, and high connectance for the TPKFS food web when compared with literature reports of other stream food webs. Periods of spate-induced disturbance during the wet season and limited algal productivity in TPKFS might also have contributed to the short food chains. Inconsistent levels of resolution for different taxonomic groups within the food web may have generated artefacts of low linkage complexity, high predator-prey ratio, and a small number of basal and intermediate species, a pattern that has been confirmed for stream food webs elsewhere. Our study is the first example of a food web based on complementary analyses of gut contents and stable isotope signatures for any tropical stream. This combined approach is recommended for future studies of food webs, especially in habitats where omnivores are an important component of the community.en_HK
dc.languageengen_HK
dc.publisherNorth American Benthological Society. The Journal's web site is located at http://www.benthos.orgen_HK
dc.relation.ispartofJournal of the North American Benthological Societyen_HK
dc.subjectAllochthonousen_HK
dc.subjectAutochthonousen_HK
dc.subjectChinaen_HK
dc.subjectConnectanceen_HK
dc.subjectFoodchain lengthen_HK
dc.subjectGut contentsen_HK
dc.subjectStable isotope signaturesen_HK
dc.subjectTai Po Kau Forest Streamen_HK
dc.titleFoodweb structure in a tropical Asian forest streamen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0887-3593&volume=23&issue=4&spage=728&epage=755&date=2004&atitle=Foodweb+structure+in+a+tropical+Asian+forest+stream-
dc.identifier.emailDudgeon, D: ddudgeon@hku.hken_HK
dc.identifier.authorityDudgeon, D=rp00691en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1899/0887-3593(2004)023<0728:FSIATA>2.0.CO;2en_HK
dc.identifier.scopuseid_2-s2.0-9644284280en_HK
dc.identifier.hkuros97934en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-9644284280&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume23en_HK
dc.identifier.issue4en_HK
dc.identifier.spage728en_HK
dc.identifier.epage755en_HK
dc.identifier.isiWOS:000225376200006-
dc.publisher.placeCanadaen_HK
dc.identifier.scopusauthoridMantel, SK=6603720784en_HK
dc.identifier.scopusauthoridSalas, M=7201582964en_HK
dc.identifier.scopusauthoridDudgeon, D=7006559840en_HK

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