D. Acha, V. Iniguez, M. Roulet, J. R. Guimaraes, R. Luna et al., Sulfate-Reducing Bacteria in Floating Macrophyte Rhizospheres from an Amazonian Floodplain Lake in Bolivia and Their Association with Hg Methylation, Applied and Environmental Microbiology, vol.71, issue.11, pp.7531-7535, 2005.
DOI : 10.1128/AEM.71.11.7531-7535.2005

D. Acha, H. Hintelmann, and J. Yeei, Importance of sulfate reducing bacteria in mercury methylation and demethylation in periphyton from Bolivian Amazon region, Chemosphere, vol.82, issue.6, pp.911-916, 2011.
DOI : 10.1016/j.chemosphere.2010.10.050

L. Atwell, K. A. Hobson, and H. E. Welch, Biomagnification and bioaccumulation of mercury in an arctic marine food web: insights from stable nitrogen isotope analysis, Canadian Journal of Fisheries and Aquatic Sciences, vol.30, issue.244, pp.1114-1121, 1998.
DOI : 10.1139/f73-051

L. Bergamino, D. Lercari, and O. Defeo, Food web structure of sandy beaches: Temporal and spatial variation using stable isotope analysis, Estuarine, Coastal and Shelf Science, vol.91, issue.4, pp.536-543, 2011.
DOI : 10.1016/j.ecss.2010.12.007

H. Beuffe, Bilan trophique des lacs et e ´ tangs landais: diagnostic d'eutrophisation, 2001.

G. Cabana, A. Tremblay, J. Kalff, and J. B. Rasmussen, ), Canadian Journal of Fisheries and Aquatic Sciences, vol.48, issue.2, pp.381-389, 1994.
DOI : 10.1139/f91-018

L. M. Campbell, R. E. Hecky, K. Nyaundi, R. Muggide, and D. G. Dixon, Distribution and Food-web Transfer of Mercury in Napoleon and Winam Gulfs, Lake Victoria, East Africa, Journal of Great Lakes Research, vol.29, issue.2, pp.267-282, 2003.
DOI : 10.1016/S0380-1330(03)70554-1

L. M. Campbell, R. J. Norstrom, K. A. Hobson, D. C. Muir, S. Backus et al., Mercury and other trace elements in a pelagic Arctic marine food web, Sci. Total Environ, pp.351-352, 2005.

L. M. Campbell, P. Verburg, D. G. Dixon, and R. E. Hecky, Mercury biomagnification in the food web of Lake Tanganyika (Tanzania, East Africa), Science of The Total Environment, vol.402, issue.2-3, pp.184-191, 2008.
DOI : 10.1016/j.scitotenv.2008.04.017

L. C. Chasar, B. C. Scudder, A. R. Stewart, A. H. Bell, and G. R. Aiken, Mercury Cycling in Stream Ecosystems. 3. Trophic Dynamics and Methylmercury Bioaccumulation, Environmental Science & Technology, vol.43, issue.8, pp.43-2733, 2009.
DOI : 10.1021/es8027567

S. A. Coelho-souza, J. R. Guimaraes, M. R. Miranda, H. Poirier, J. B. Mauro et al., Mercury and flooding cycles in the Tapaj??s river basin, Brazilian Amazon: The role of periphyton of a floating macrophyte (Paspalum repens), Science of The Total Environment, vol.409, issue.14, pp.2746-2753, 2011.
DOI : 10.1016/j.scitotenv.2011.03.028

S. Dandelot, R. Verlaque, A. Dutartre, and A. Cazaubon, Ecological, Dynamic and Taxonomic Problems Due to Ludwigia (Onagraceae) in France, Hydrobiologia, vol.71, issue.345, pp.131-136, 2005.
DOI : 10.1051/kmae:1997038

S. Dandelot, R. Matheron, L. Petit, J. Verlaque, R. Cazaubon et al., Variations temporelles des param??tres physicochimiques et microbiologiques de trois ??cosyst??mes aquatiques (Sud-Est de la France) envahis par des Ludwigia, Comptes Rendus Biologies, vol.328, issue.10-11, pp.991-999, 2005.
DOI : 10.1016/j.crvi.2005.09.007

M. J. Deniro and S. Epstein, Influence of diet on the distribution of carbon isotopes in animals, Geochimica et Cosmochimica Acta, vol.42, issue.5, pp.495-506, 1978.
DOI : 10.1016/0016-7037(78)90199-0

M. Desrosiers, D. Planas, and A. Mucci, Mercury Methylation in the Epilithon of Boreal Shield Aquatic Ecosystems, Environmental Science & Technology, vol.40, issue.5, pp.1540-1546, 2006.
DOI : 10.1021/es0508828

Y. Dominique, R. Maury-brachet, B. Muresan, R. Vigouroux, S. Richard et al., BIOFILM AND MERCURY AVAILABILITY AS KEY FACTORS FOR MERCURY ACCUMULATION IN FISH (CURIMATA CYPRINOIDES) FROM A DISTURBED AMAZONIAN FRESHWATER SYSTEM, Environmental Toxicology and Chemistry, vol.26, issue.1, pp.45-52, 2007.
DOI : 10.1897/05-649R.1

E. Dufour and D. Gerdeaux, Contribution of stable isotopes to fish ecological studies, Cybium, vol.25, issue.4, pp.369-382, 2001.

A. Dutartre, A. Delarche, and J. Dulong, Plan de gestion de la vé gé tation aquatique des lacs et e ´ tangs landais, 1989.

A. Dutartre, J. Haury, S. Dandelot, J. Coudreuse, B. Ruaux et al., Les jussies: caracté risation des relations entre sites, populations et activité s humaines. Implications pour la gestion. Pro-gramme de recherche INVABIO, rapport final, p.128, 2007.

D. R. Engstrom, S. J. Balogh, and E. B. Swain, History of mercury inputs to Minnesota lakes: Influences of watershed disturbance and localized atmospheric deposition, Limnology and Oceanography, vol.52, issue.6, pp.2467-2683, 2007.
DOI : 10.4319/lo.2007.52.6.2467

S. Feyte, C. Gobeil, A. Tessier, and D. Cossa, Mercury dynamics in lake sediments, Geochimica et Cosmochimica Acta, vol.82, pp.92-112, 2012.
DOI : 10.1016/j.gca.2011.02.007

W. F. Fitzgerald, D. R. Engstrom, R. P. Mason, and E. A. Nater, The Case for Atmospheric Mercury Contamination in Remote Areas, Environmental Science & Technology, vol.32, issue.1, pp.1-7, 1998.
DOI : 10.1021/es970284w

A. S. Flecker, Fish Trophic Guilds and the Stucture of a Tropical Stream: Weak Direct vs. Strong Indirect Effects, Ecology, vol.73, issue.3, pp.927-940, 1992.
DOI : 10.2307/1940169

S. Gent-es, M. Monperrus, A. Legeay, R. Maury-brachet, S. Davail et al., Incidence of invasive macrophytes on methylmercury budget in temperate lakes: Central role of bacterial periphytic communities, Environmental Pollution, vol.172, pp.116-123, 2013.
DOI : 10.1016/j.envpol.2012.08.004

J. R. Guimaraes, M. Meili, O. Malm, E. M. Brito, and D. Souza, Hg methylation in sediments and floating meadows of a tropical lake in the Pantanal floodplain, Brazil, Science of The Total Environment, vol.213, issue.1-3, pp.165-175, 1998.
DOI : 10.1016/S0048-9697(98)00089-8

J. R. Guimaraes, M. Meili, L. D. Hylander, E. Castro-e-silva, M. Roulet et al., Mercury net methylation in five tropical flood plain regions of Brazil: high in the root zone of floating macrophyte mats but low in surface sediments and flooded soils, The Science of The Total Environment, vol.261, issue.1-3, pp.99-107, 2000.
DOI : 10.1016/S0048-9697(00)00628-8

B. D. Hall, R. A. Bodaly, R. J. Fudge, J. W. Rudd, and D. M. Rosenberg, Food as the dominant pathway of methylmercury uptake by fish, Water Air Soil Pollut, vol.100, pp.13-24, 1997.

B. D. Hall, D. M. Rosenberg, and A. P. Wiens, Methyl mercury in aquatic insects from an experimental reservoir, Canadian Journal of Fisheries and Aquatic Sciences, vol.55, issue.9, pp.2036-2047, 1998.
DOI : 10.1139/f98-079

B. D. Hall, L. A. Baron, and C. M. Somers, Mercury Concentrations in Surface Water and Harvested Waterfowl from the Prairie Pothole Region of Saskatchewan, Environmental Science & Technology, vol.43, issue.23, pp.8759-8766, 2009.
DOI : 10.1021/es9024589

S. Hamelin, M. Amyot, T. Barkay, Y. Wang, and D. Planas, Methanogens: Principal Methylators of Mercury in Lake Periphyton, Environmental Science & Technology, vol.45, issue.18, pp.7693-7700, 2011.
DOI : 10.1021/es2010072

R. Harris and R. A. Bodaly, Temperature, growth and dietary effects on fish mercury dynamics in two Ontario lakes, Biogeochemistry, vol.40, issue.2/3, pp.175-187, 1998.
DOI : 10.1023/A:1005986505407

R. H. Hesslein, K. A. Hallard, and P. Ramlal, N, Canadian Journal of Fisheries and Aquatic Sciences, vol.148, issue.10, pp.2071-2076, 1993.
DOI : 10.1007/BF00379558

T. D. Jardine, K. A. Kidd, and A. T. Fisk, Applications, Considerations, and Sources of Uncertainty When Using Stable Isotope Analysis in Ecotoxicology, Environmental Science & Technology, vol.40, issue.24, pp.40-7501, 2006.
DOI : 10.1021/es061263h

C. G. Jones, J. H. Lawton, and M. Shachak, POSITIVE AND NEGATIVE EFFECTS OF ORGANISMS AS PHYSICAL ECOSYSTEM ENGINEERS, Ecology, vol.78, issue.7, pp.1946-1957, 1997.
DOI : 10.2307/1940449

W. J. Junk and M. T. Piedade, Plant life in the floodplain with special reference to herbaceous plants The Central Amazon Floodplain Ecology of a Pulsing System, pp.147-185, 1997.

K. A. Kidd, R. H. Hesslein, R. J. Fudge, and K. A. Hallard, The influence of trophic level as measured by ?15N on mercury concentrations in freshwater organisms, Water, Air, & Soil Pollution, vol.47, issue.2, pp.1011-1015, 1995.
DOI : 10.1007/BF01189756

K. A. Kidd, H. A. Bootsma, R. H. Hesslein, W. L. Lockhart, and R. E. Hecky, Mercury Concentrations in the Food Web of Lake Malawi, East Africa, Journal of Great Lakes Research, vol.29, pp.258-266, 2003.
DOI : 10.1016/S0380-1330(03)70553-X

E. Kristensen and F. Ø. Andersen, Determination of organic carbon in marine sediments: a comparison of two CHN-analyzer methods, Journal of Experimental Marine Biology and Ecology, vol.109, issue.1, pp.15-23, 1987.
DOI : 10.1016/0022-0981(87)90182-1

S. Y. Kwon, P. B. Mcintyre, A. S. Flecker, and L. M. Campbell, Mercury biomagnification in the food web of a neotropical stream, Science of The Total Environment, vol.417, issue.418, pp.417-418, 2012.
DOI : 10.1016/j.scitotenv.2011.11.060

E. Lambert, A. Dutartre, J. Coudreuse, and J. Haury, Relationships between the biomass production of invasive Ludwigia species and physical properties of habitats in France, Hydrobiologia, vol.14, issue.3, pp.173-186, 2010.
DOI : 10.1016/j.ecolecon.2004.06.019
URL : https://hal.archives-ouvertes.fr/hal-00729607

R. G. Leite, C. A. Araú-jo-lima, R. L. Victoria, and L. A. Martinelli, Stable isotope analysis of energy sources for larvae of eight fish species from the Amazon floodplain, Ecology of Freshwater Fish, vol.11, issue.1, pp.56-63, 2002.
DOI : 10.1093/plankt/17.8.1633

L. A. Martinelli, R. L. Victoria, B. R. Forsberg, and J. E. Richey, Isotopic composition of majors carbon reservoirs in the Amazon floodplain, Int. J. Ecol. Environ. Sci, vol.20, pp.31-46, 1994.

R. P. Mason, J. R. Reinfelder, and F. M. Morel, Bioaccumulation of mercury and methylmercury, Water, Air, & Soil Pollution, vol.52, issue.1-4, pp.915-921, 1995.
DOI : 10.1007/BF01189744

J. B. Mauro, J. R. Guimaraes, and R. Melamed, Mercury methylation in macrophyte roots of a tropical lake, Water, Air, and Soil Pollution, vol.127, issue.1/4, pp.271-280, 2001.
DOI : 10.1023/A:1005222902966

J. B. Mauro, J. R. Guimaraes, H. Hintelmann, C. J. Watras, E. A. Haack et al., Mercury methylation in macrophytes, periphyton, and water: comparative studies with stable and radio-mercury additions, Anal. Bioanaly. Chem, vol.374, pp.983-989, 2002.

T. Mcconnaughey and C. P. Mcroy, Food-Web structure and the fractionation of Carbon isotopes in the bering sea, Marine Biology, vol.17, issue.3, pp.257-262, 1979.
DOI : 10.1007/BF00952434

J. M. Melack, B. R. Forsberg, M. E. Mcclain, and R. L. Victoria, Biogeochemistry of Amazon floodplain lakes and associated wetlands The Biogeochemistry of the Amazon Basin, pp.235-274, 2001.

D. Mergler, H. A. Anderson, L. H. Chan, K. R. Mahaffey, M. Murray et al., Methylmercury Exposure and Health Effects in Humans: A Worldwide Concern, AMBIO: A Journal of the Human Environment, vol.36, issue.1, pp.3-11, 2007.
DOI : 10.1579/0044-7447(2007)36[3:MEAHEI]2.0.CO;2

R. B. Mills, A. M. Paterson, J. M. Blais, D. R. Lean, J. P. Smol et al., Factors influencing the achievement of steady state in mercury contamination among lakes and catchments of south-central Ontario, Canadian Journal of Fisheries and Aquatic Sciences, vol.40, issue.5071, pp.187-200, 2009.
DOI : 10.1139/f05-009

M. Minagawa and E. Wada, Stepwise enrichment of 15N along food chains: Further evidence and the relation between ??15N and animal age, Geochimica et Cosmochimica Acta, vol.48, issue.5, pp.1135-1140, 1984.
DOI : 10.1016/0016-7037(84)90204-7

C. I. Molina, F. M. Gibon, J. L. Duprey, E. Dominguez, J. R. Guimaraes et al., Transfer of mercury and methylmercury along macroinvertebrate food chains in a floodplain lake of the Beni River, Bolivian Amazonia, Science of The Total Environment, vol.408, issue.16, pp.3382-3391, 2010.
DOI : 10.1016/j.scitotenv.2010.04.019

B. A. Monson and P. L. Brezonik, Seasonal patterns of mercury species in water and plankton from softwater lakes in Northeastern Minnesota, Biogeochemistry, vol.40, issue.2/3, pp.147-162, 1998.
DOI : 10.1023/A:1005967413585

D. Muir, X. Wang, F. Yang, N. Nguyen, T. A. Jackson et al., Spatial Trends and Historical Deposition of Mercury in Eastern and Northern Canada Inferred from Lake Sediment Cores, Environmental Science & Technology, vol.43, issue.13, pp.4802-4809, 2009.
DOI : 10.1021/es8035412

A. Persic, H. L. Roche, and F. Ramade, Stable carbon and nitrogen isotope quantitative structural assessment of dominant species from the Vaccar??s Lagoon trophic web (Camargue Biosphere Reserve, France), Estuarine, Coastal and Shelf Science, vol.60, issue.2, pp.261-272, 2004.
DOI : 10.1016/j.ecss.2004.01.009

B. J. Peterson and B. Fry, Stable Isotopes in Ecosystem Studies, Annual Review of Ecology and Systematics, vol.18, issue.1, pp.293-320, 1987.
DOI : 10.1146/annurev.es.18.110187.001453

D. M. Post, USING STABLE ISOTOPES TO ESTIMATE TROPHIC POSITION: MODELS, METHODS, AND ASSUMPTIONS, Ecology, vol.83, issue.3, pp.703-718, 2002.
DOI : 10.4319/lo.1994.39.5.1030

D. M. Post, C. A. Layman, D. A. Arrington, G. Takimoto, J. Quattrochi et al., Getting to the fat of the matter: models, methods and assumptions for dealing with lipids in stable isotope analyses, Oecologia, vol.83, issue.1, pp.179-189, 2007.
DOI : 10.1139/o59-099

M. Power, G. M. Klein, K. R. Guiguer, and M. K. Kwan, Mercury accumulation in the fish community of a sub-Arctic lake in relation to trophic position and carbon sources, Journal of Applied Ecology, vol.119, issue.161, pp.819-830, 2002.
DOI : 10.1577/1548-8659(1990)119<0862:FIMCIW>2.3.CO;2

D. M. Richardson, P. Pysek, M. Rejmank, M. G. Barbour, D. Panetta et al., Naturalization and invasion of alien plants: concepts and definitions, Diversity <html_ent glyph="@amp;" ascii="&"/> Distributions, vol.40, issue.2, pp.93-107, 2000.
DOI : 10.2307/2937282

M. Roulet, M. Lucotte, J. R. Guimaraes, and I. Rheault, Methylmercury in water, seston, and epiphyton of an Amazonian river and its floodplain, Tapaj????s River, Brazil, The Science of The Total Environment, vol.261, issue.1-3, pp.43-59, 2000.
DOI : 10.1016/S0048-9697(00)00594-5

A. L. Rypel, D. A. Arrington, and R. H. Findlay, Mercury in Southeastern U.S. Riverine Fish Populations Linked to Water Body Type, Environmental Science & Technology, vol.42, issue.14, pp.5118-5124, 2008.
DOI : 10.1021/es8001772

A. R. Stewart, M. K. Saiki, J. S. Kuwabara, C. N. Alpers, M. Marvin-dipasquale et al., Influence of plankton mercury dynamics and trophic pathways on mercury concentrations of top predator fish of a miningimpacted reservoir, Can. J. Fish. Aquat. Sci, issue.11, pp.65-2351, 2008.

C. J. Sweeting, N. V. Polunin, and S. Et-jennings, Effects of chemical lipid extraction and arithmetic lipid correction on stable isotope ratios of fish tissues, Rapid Communications in Mass Spectrometry, vol.79, issue.4, pp.595-601, 2006.
DOI : 10.1139/o59-099

J. Vander-zanden and J. B. Rasmussen, A Trophic Position Model of Pelagic Food Webs: Impact on Contaminant Bioaccumulation in Lake Trout, Ecological Monographs, vol.66, issue.4, pp.451-477, 1996.
DOI : 10.2307/2963490

M. J. Vander-zanden, J. M. Casselman, and J. B. Rasmussen, Stable isotope evidence for the food web consequences of species invasions in lakes, Nature, vol.401, issue.6752, pp.464-467, 1999.
DOI : 10.1038/46762

S. Vizzini, G. Sara, R. H. Michener, and A. Mazzola, The role and contribution of the seagrass Posidonia oceanica (L.) Delile organic matter for secondary consumers as revealed by carbon and nitrogen stable isotope analysis, Acta Oecologica, vol.23, issue.4, pp.277-285, 2002.
DOI : 10.1016/S1146-609X(02)01156-6

M. D. Ward, K. H. Nislow, and C. L. Folt, Bioaccumulation syndrome: identifying factors that make some stream food webs prone to elevated mercury bioaccumulation, Annals of the New York Academy of Sciences, vol.45, issue.Suppl. B, pp.62-83, 2010.
DOI : 10.1007/978-1-4612-1724-4_5
URL : https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2977981/pdf

C. J. Watras, R. C. Back, S. Halvorsen, R. J. Hudson, K. A. Morrison et al., Bioaccumulation of mercury in pelagic freshwater food webs, Science of The Total Environment, vol.219, issue.2-3, pp.183-208, 1998.
DOI : 10.1016/S0048-9697(98)00228-9

M. F. Wolfe, S. Schwarzbach, and R. A. Sulaiman, Effects of mercury on wildlife: A comprehensive review, Environmental Toxicology and Chemistry, vol.208, issue.2, pp.146-160, 1998.
DOI : 10.1080/15298668291409811