ORBi: Bisi Tatiana - Trophic relationships and mercury biomagnification in Brazilian tropical coastal food webs

Reference : Trophic relationships and mercury biomagnification in Brazilian tropical coastal food webs


	Document type :	Scientific journals : Article
	Discipline(s) :	Life sciences : Aquatic sciences & oceanology Life sciences : Environmental sciences & ecology Life sciences : Zoology
	To cite this reference:	http://hdl.handle.net/2268/106004

Title :	Trophic relationships and mercury biomagnification in Brazilian tropical coastal food webs
Language :	English
Author, co-author :	Bisi, Tatiana [University of Rio de Janeiro State (UERJ) > School of Oceanography, > Aquatic Mammal and Bioindicator Laboratory (MAQUA), > Dr >]
	Lepoint, Gilles [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Océanologie]
	de Freitas Azevedo [University of Rio de Janeiro State (UERJ) > School of Oceanography > Aquatic Mammal and Bioindicator Laboratory (MAQUA) > >]
	Dorneles, Paulo Renato [University of Rio de Janeiro State (UERJ) > School of Oceanography > Aquatic Mammal and Bioindicator Laboratory (MAQUA) > >]
	Flach, Leonardo [Projeto Boto cinza > > > >]
	Das, Krishna [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Océanologie]
	Malm, Olaf [Federal University of Rio de Janeiro (UFRJ) > Biophysics Institute > Radioisotope Laboratory > Prof >]
	Lailson-Brito", José [University of Rio de Janeiro State (UERJ) > School of Oceanography > Aquatic Mammal and Bioindicator Laboratory (MAQUA) > >]
Publication date :	2012
Journal title :	Ecological Indicators
Publisher :	Elsevier Science
Volume :	18
Issue/season :	0
Pages :	291 - 302
Audience :	International
ISSN :	1470-160X
City :	Amsterdam
Country :	The Netherlands
Keywords :	[en] Tropical ecosystems ; Food web ; Stable isotope ; Heavy metal ; Bioaccumulation ; Guiana dolphin
Abstract :	[en] The present study investigated trophic relationships and mercury flow through food webs of three tropical coastal ecosystems: Guanabara, Sepetiba and Ilha Grande bays. The investigation was carried out through carbon and nitrogen stable isotopes (δ13C, δ15N) and total mercury (THg) determination in muscle from 35 species, including crustacean, cephalopod, fish and dolphin species. Detritivorous species showed the lowest average δ15N values in all bays. These species were 13C enriched in Sepetiba and Ilha Grande bays, suggesting the presence of 13C enriched macroalgae in their diet. The highest mean δ15N values were found in fish and benthic invertebrate feeders, as well as in species presenting demerso-pelagic feeding habit. The carbon and nitrogen isotopic findings showed different trophic relationship in food webs from Sepetiba, Guanabara and Ilha Grande bays. Guanabara Bay showed to be depleted in δ15N compared to both Sepetiba and Ilha Grande bays. The latter finding suggests substantial contribution of atmospheric nitrogen fixation by cyanobacteria. A positive linear relationship was found between log THg concentrations and δ15N values for Guanabara and Ilha Grande bays, but not for Sepetiba Bay. Our findings showed trophic magnification factors (TMF) above 1, demonstrating that THg is being biomagnified up the food chains in Rio de Janeiro bays. Highlights ► The δ13C and δ15N findings showed different trophic relationship in food webs from Rio de Janeiro bays. ► Guanabara Bay showed depleted δ15N values compared to Sepetiba and Ilha Grande bays. ► Ilha Grande Bay showed significant depleted δ13C values. ► Our findings indicate THg biomagnifications up food webs in Rio de Janeiro bays. ► Ilha Grande Bay food web showed the highest trophic magnification factor.
Research units :	Centre Interfacultaire de Recherches en Océanologie - MARE ; Aquatic Mammal and Bioindicator Laboratory (MAQUA), School of Oceanography, University of Rio de Janeiro State (UERJ),
Funders :	Rio de Janeiro State Government Research Agency – FAPERJ (“Pensa Rio” Program – Proc. E-26/110.371/2007) ; Brazilian Research Council – CNPq (Proc. 482938/2007-2 and Proc. 480701/2009-1) ; CAPES (“Ciencias do Mar” – Proc. 23038.051661/2009-18) ; Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Target :	Researchers ; Students
Permalink :	http://hdl.handle.net/2268/106004
DOI :	10.1016/j.ecolind.2011.11.015
Other URL :	http://www.sciencedirect.com/science/article/pii/S1470160X11003803

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Restricted access	Bisi et al Ecol Ind 2011.pdf		Publisher postprint	767.12 kB	Request copy
Open access	Bisi et al. 2012 final revised version.doc	non edited final Author version	Author preprint	1.8 MB	View/Open

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