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Article: Spatial, seasonal, and ontogenetic variations in the significance of detrital pathways and terrestrial carbon for a benthic shark, Chiloscyllium plagiosum (Hemiscylliidae), in a tropical estuary

TitleSpatial, seasonal, and ontogenetic variations in the significance of detrital pathways and terrestrial carbon for a benthic shark, Chiloscyllium plagiosum (Hemiscylliidae), in a tropical estuary
Authors
Issue Date2011
PublisherAmerican Society of Limnology and Oceanography, Inc. The Journal's web site is located at http://aslo.org/lo/
Citation
Limnology And Oceanography, 2011, v. 56 n. 3, p. 1035-1053 How to Cite?
AbstractUsing a combination of stable isotope analyses (SIA), fatty acid profiling (FAP), and FA-specific SIA, we investigated the relative importance of terrestrial- and marine-derived carbon, and spatial (inshore vs. offshore), seasonal (wet vs. dry season), and ontogenetic variations, in the relative contribution of detrital pathways to the white-spotted bamboo shark, Chiloscyllium plagiosum in the Pearl River estuary. SIA and FAP suggested the sharks acquired carbon from both marine- and terrestrial-derived detritus via consumption of polychaetes and small crustaceans, with carbon from terrestrial sources being more important to juveniles (25-50 cm long) at inshore locations. Juveniles generally had significantly higher levels of diatom FA, bacterial FA, and long-chaincarbon- saturated FA biomarkers than adults (> 65 cm), especially during the wet season, suggesting that they relied on primary consumers which assimilated a mixture of autotrophic and detrital carbon sources. Levels of zooplankton and animal-derived FA biomarkers generally increased with shark size, indicating an ontogenetic dietary shift. Utilizing the results of FA-specific SIA (i.e., δ 13C values of individual bacterial FA of detritus) from four sources (i.e., terrestrial plant litter, macroalgae, phytoplankton, and sediments), Bayesian mixing models revealed juveniles in the inner estuary assimilated significantly higher amounts of terrestrial carbon (37-45%) than adults (22-37%) or sharks in the outer estuary (1-36%). The combined use of multiple dietary tracers effectively revealed the interaction of various detrital pathways to marine predators in the Pearl River estuary, and highlighted the importance of terrestrial-marine linkages for interpretation of energy flow in coastal ecosystems. © 2011, by the American Society of Limnology and Oceanography, Inc.
Persistent Identifierhttp://hdl.handle.net/10722/133728
ISSN
2015 Impact Factor: 3.66
2015 SCImago Journal Rankings: 2.485
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council of Hong Kong SAR, ChinaHKU 778207M
HKU200807176173
Funding Information:

We thank our colleagues at The Swire Institute of Marine Science and School of Biological Sciences, The University of Hong Kong (HKU) for their help with laboratory and fieldwork, especially Cecily Law and Jessie Lai. We acknowledge two anonymous reviewers for their helpful comments. This study was supported by a Competitive Earmarked Research Grant (project HKU 778207M) from the Research Grants Council of Hong Kong SAR, China and a Small Project Grant (project 200807176173) from HKU.

References
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DC FieldValueLanguage
dc.contributor.authorWai, TCen_HK
dc.contributor.authorLeung, KMYen_HK
dc.contributor.authorSin, SYTen_HK
dc.contributor.authorCornish, Aen_HK
dc.contributor.authorDudgeon, Den_HK
dc.contributor.authorWilliams, GAen_HK
dc.date.accessioned2011-05-24T02:16:58Z-
dc.date.available2011-05-24T02:16:58Z-
dc.date.issued2011en_HK
dc.identifier.citationLimnology And Oceanography, 2011, v. 56 n. 3, p. 1035-1053en_HK
dc.identifier.issn0024-3590en_HK
dc.identifier.urihttp://hdl.handle.net/10722/133728-
dc.description.abstractUsing a combination of stable isotope analyses (SIA), fatty acid profiling (FAP), and FA-specific SIA, we investigated the relative importance of terrestrial- and marine-derived carbon, and spatial (inshore vs. offshore), seasonal (wet vs. dry season), and ontogenetic variations, in the relative contribution of detrital pathways to the white-spotted bamboo shark, Chiloscyllium plagiosum in the Pearl River estuary. SIA and FAP suggested the sharks acquired carbon from both marine- and terrestrial-derived detritus via consumption of polychaetes and small crustaceans, with carbon from terrestrial sources being more important to juveniles (25-50 cm long) at inshore locations. Juveniles generally had significantly higher levels of diatom FA, bacterial FA, and long-chaincarbon- saturated FA biomarkers than adults (> 65 cm), especially during the wet season, suggesting that they relied on primary consumers which assimilated a mixture of autotrophic and detrital carbon sources. Levels of zooplankton and animal-derived FA biomarkers generally increased with shark size, indicating an ontogenetic dietary shift. Utilizing the results of FA-specific SIA (i.e., δ 13C values of individual bacterial FA of detritus) from four sources (i.e., terrestrial plant litter, macroalgae, phytoplankton, and sediments), Bayesian mixing models revealed juveniles in the inner estuary assimilated significantly higher amounts of terrestrial carbon (37-45%) than adults (22-37%) or sharks in the outer estuary (1-36%). The combined use of multiple dietary tracers effectively revealed the interaction of various detrital pathways to marine predators in the Pearl River estuary, and highlighted the importance of terrestrial-marine linkages for interpretation of energy flow in coastal ecosystems. © 2011, by the American Society of Limnology and Oceanography, Inc.en_HK
dc.languageengen_US
dc.publisherAmerican Society of Limnology and Oceanography, Inc. The Journal's web site is located at http://aslo.org/lo/en_HK
dc.relation.ispartofLimnology and Oceanographyen_HK
dc.titleSpatial, seasonal, and ontogenetic variations in the significance of detrital pathways and terrestrial carbon for a benthic shark, Chiloscyllium plagiosum (Hemiscylliidae), in a tropical estuaryen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0024-3590&volume=56&issue=3&spage=1035&epage=1053&date=2011&atitle=Spatial,+seasonal,+and+ontogenetic+variations+in+the+significance+of+detrital+pathways+and+terrestrial+carbon+for+a+benthic+shark,+Chiloscyllium+plagiosum+(Hemiscylliidae),+in+a+tropical+estuary-
dc.identifier.emailWai, TC: waitc@hkucc.hku.hken_HK
dc.identifier.emailLeung, KMY: kmyleung@hku.hken_HK
dc.identifier.emailDudgeon, D: ddudgeon@hku.hken_HK
dc.identifier.emailWilliams, GA: hrsbwga@hkucc.hku.hken_HK
dc.identifier.authorityWai, TC=rp00797en_HK
dc.identifier.authorityLeung, KMY=rp00733en_HK
dc.identifier.authorityDudgeon, D=rp00691en_HK
dc.identifier.authorityWilliams, GA=rp00804en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.4319/lo.2011.56.3.1035en_HK
dc.identifier.scopuseid_2-s2.0-79956366886en_HK
dc.identifier.hkuros185166en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79956366886&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume56en_HK
dc.identifier.issue3en_HK
dc.identifier.spage1035en_HK
dc.identifier.epage1053en_HK
dc.identifier.isiWOS:000290678100022-
dc.publisher.placeUnited Statesen_HK
dc.relation.projectTrophic links between terrestrial and marine ecosystems: the source and fate of detrital materials driving intertidal and subtidal communities-
dc.identifier.scopusauthoridWai, TC=15039017100en_HK
dc.identifier.scopusauthoridLeung, KMY=7401860738en_HK
dc.identifier.scopusauthoridSin, SYT=54080253400en_HK
dc.identifier.scopusauthoridCornish, A=7006637048en_HK
dc.identifier.scopusauthoridDudgeon, D=7006559840en_HK
dc.identifier.scopusauthoridWilliams, GA=7406082821en_HK

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