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dc.contributor.authorBlanchette, Melanie L
dc.contributor.authorDavis, Aaron M
dc.contributor.authorJardine, Timothy D
dc.contributor.authorPearson, Richard G
dc.date.accessioned2017-05-03T13:17:03Z
dc.date.available2017-05-03T13:17:03Z
dc.date.issued2014
dc.identifier.issn2161-9549
dc.identifier.doi10.1086/674632
dc.identifier.urihttp://hdl.handle.net/10072/67460
dc.description.abstractWe analyzed basal sources, trophic levels, and connectance in dry-season food webs on 4 rivers in the upper Burdekin catchment in the dry tropics of northeastern Australia. The region is characterized by episodic summer rainfall, and most of the annual river flow occurs in a short period. In the dry season, rivers typically contract into a series of water holes of varying permanence and hydrologic connectivity. We used stable-isotope and stomach-content analyses to identify trophic levels of macroinvertebrates and fish, and we used a mixing model (SIAR) to identify foodweb basal sources at each site. We found substantial variability among sites in basal-source contributions, trophic position of individual taxa, and foodweb structure, and sites from the same river often were as different as sites from different rivers. Important basal sources at different sites included allochthonous tree litter, autochthonous algae and macrophytes, and Fe-fixing bacteria. Many relationships between consumers and basal sources were not resolved in the mixing model, mainly because of extensive omnivory or isotopic overlap among sources. Nevertheless, our results show high variability of dry-tropics river communities that extends beyond previously described macroinvertebrate assemblages to the broader food web. However, the main components of the upper trophic levels were similar across sites, such that different lower trophic levels supported similar assemblages of top consumers. These tropical rivers were defined by omnivory and ecological opportunism, which may be adaptations to seasonal hydrological variability.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.format.extent1045439 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglish
dc.language.isoeng
dc.publisherNorth American Benthological Society
dc.publisher.placeUnited States
dc.relation.ispartofstudentpublicationN
dc.relation.ispartofpagefrom142
dc.relation.ispartofpageto158
dc.relation.ispartofissue1
dc.relation.ispartofjournalFreshwater Science
dc.relation.ispartofvolume33
dc.rights.retentionY
dc.subject.fieldofresearchEcosystem Function
dc.subject.fieldofresearchEcology
dc.subject.fieldofresearchOther Biological Sciences
dc.subject.fieldofresearchcode050102
dc.subject.fieldofresearchcode0602
dc.subject.fieldofresearchcode0699
dc.titleOmnivory and opportunism characterize food webs in a large dry-tropics river system
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.rights.copyright© 2014 North American Benthological Society. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
gro.hasfulltextFull Text
gro.griffith.authorJardine, Timothy


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