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Article: Foodweb structure in small streams: Do we need different models for the tropics?

TitleFoodweb structure in small streams: Do we need different models for the tropics?
Authors
KeywordsAutochthonous
Detritus
Gut-content analysis
Hong Kong
Omnivory
Stable-isotope analysis
Issue Date2010
PublisherNorth American Benthological Society. The Journal's web site is located at http://www.benthos.org
Citation
Journal Of The North American Benthological Society, 2010, v. 29 n. 2, p. 395-412 How to Cite?
AbstractPrevailing notions of foodweb structure and trophic relations in fresh waters are based on research undertaken in a limited range of latitudes or habitat types. This limitation had led to the general view that stream food webs are detritus-based with short food chains and simple interactions that often are dominated by a few key species. We used gut-content analyses and stable-isotope signatures to characterize feeding relationships and foodweb attributes of benthic communities in riffles in 2 forest streams in Hong Kong. We compared them with existing data on foodweb structure from pools in 1 of the streams and data from the literature. The 2 approaches to dietary analyses yielded complementary results, providing confidence that trophic relations and foodweb structure were adequately characterized. Food webs in both streams were remarkably similar regardless of habitat (riffle vs pool). Consumers in both streams depended primarily on autochthonous resources, as has been reported from some other tropical streams, and food chains were short although connectance was higher than has been recorded previously for stream food webs. Very few omnivores were found, and omnivory was even rarer than is typical of temperate streams, although it is common in other tropical streams and rivers. No evidence was found for dominance by a few common macroconsumer species, as observed elsewhere in the tropics. The apparently high levels of autochthony in tropical running waters imply that models of ecosystem functioning for northern temperate streams are inadequate for describing tropical systems. However, marked differences in the degree of omnivory and dominance of tropical stream food webs by macroconsumers is evidence that characterization of trophic interactions and stream ecosystem functioning cannot be captured by a simple tropical vs temperate dichotomy. Successful management of these systems will depend upon development of conceptual models that reflect the diversity of food webs within and between regions. © 2010 by The North American Benthological Society.
Persistent Identifierhttp://hdl.handle.net/10722/137055
ISSN
2013 Impact Factor: 2.706
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council of Hong Kong Special Administrative Region, China[HKU] 7509/06M
Funding Information:

We are grateful to Lily C. Y. Ng for technical support, Maria Salas for input into the initial stages of the study, and Michael Chadwick, Nikite Muller, and 2 anonymous referees for comments on the manuscript. The work described in this paper was partially supported by a grant from the Research Grants Council of Hong Kong Special Administrative Region, China (Project No. [HKU] 7509/06M). This paper is dedicated to the late Noel H. B. Hynes, in acknowledgement of his inspirational contributions to stream ecology.

References

 

DC FieldValueLanguage
dc.contributor.authorDudgeon, Den_HK
dc.contributor.authorCheung, FKWen_HK
dc.contributor.authorMantel, SKen_HK
dc.date.accessioned2011-08-04T08:39:17Z-
dc.date.available2011-08-04T08:39:17Z-
dc.date.issued2010en_HK
dc.identifier.citationJournal Of The North American Benthological Society, 2010, v. 29 n. 2, p. 395-412en_HK
dc.identifier.issn0887-3593en_HK
dc.identifier.urihttp://hdl.handle.net/10722/137055-
dc.description.abstractPrevailing notions of foodweb structure and trophic relations in fresh waters are based on research undertaken in a limited range of latitudes or habitat types. This limitation had led to the general view that stream food webs are detritus-based with short food chains and simple interactions that often are dominated by a few key species. We used gut-content analyses and stable-isotope signatures to characterize feeding relationships and foodweb attributes of benthic communities in riffles in 2 forest streams in Hong Kong. We compared them with existing data on foodweb structure from pools in 1 of the streams and data from the literature. The 2 approaches to dietary analyses yielded complementary results, providing confidence that trophic relations and foodweb structure were adequately characterized. Food webs in both streams were remarkably similar regardless of habitat (riffle vs pool). Consumers in both streams depended primarily on autochthonous resources, as has been reported from some other tropical streams, and food chains were short although connectance was higher than has been recorded previously for stream food webs. Very few omnivores were found, and omnivory was even rarer than is typical of temperate streams, although it is common in other tropical streams and rivers. No evidence was found for dominance by a few common macroconsumer species, as observed elsewhere in the tropics. The apparently high levels of autochthony in tropical running waters imply that models of ecosystem functioning for northern temperate streams are inadequate for describing tropical systems. However, marked differences in the degree of omnivory and dominance of tropical stream food webs by macroconsumers is evidence that characterization of trophic interactions and stream ecosystem functioning cannot be captured by a simple tropical vs temperate dichotomy. Successful management of these systems will depend upon development of conceptual models that reflect the diversity of food webs within and between regions. © 2010 by The North American Benthological Society.en_HK
dc.languageeng-
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.subjectAutochthonousen_HK
dc.subjectDetritusen_HK
dc.subjectGut-content analysisen_HK
dc.subjectHong Kongen_HK
dc.subjectOmnivoryen_HK
dc.subjectStable-isotope analysisen_HK
dc.titleFoodweb structure in small streams: Do we need different models for the tropics?en_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0887-3593&volume=29&issue=2&spage=395&epage=412&date=2010&atitle=Foodweb+structure+in+small+streams:+do+we+need+different+models+for+the+tropics?-
dc.identifier.emailDudgeon, D: ddudgeon@hku.hken_HK
dc.identifier.authorityDudgeon, D=rp00691en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1899/09-058.1en_HK
dc.identifier.scopuseid_2-s2.0-77249141747en_HK
dc.identifier.hkuros179046-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77249141747&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume29en_HK
dc.identifier.issue2en_HK
dc.identifier.spage395en_HK
dc.identifier.epage412en_HK
dc.identifier.isiWOS:000277472300002-
dc.publisher.placeCanadaen_HK
dc.identifier.scopusauthoridDudgeon, D=7006559840en_HK
dc.identifier.scopusauthoridCheung, FKW=35572736300en_HK
dc.identifier.scopusauthoridMantel, SK=6603720784en_HK
dc.identifier.citeulike9837455-

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