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Water, sediment, bivalves, and fish samples were collected during 2001 at 11 sites. Fish were also collected in the Jurumirim and Salto Grande Reservoirs which are 39 and 52 yr old since impoundment, respectively. Results showed that Hg concentrations were low in almost all samples, except fish from Jurumirim Reservoir (total mercury [T\u2010Hg] = 1.14 \u00b1 0.55 mg kg<jats:sup>\u22121<\/jats:sup> wet wt.). In spite of industrialization and high population, the results showed that there was no important source of Hg contamination in the investigated areas. The higher concentrations found in fish from Jurumirim seem to be the result of processes that favor Hg mobilization and methylation as a consequence of the impoundment of the reservoir area. The same levels were not observed in the Salto Grande Reservoir, probably because these are no longer significant due to the long time since the impoundment. To understand the dynamics of methylmercury (MeHg) production and its accumulation in fish, further studies are needed in the Jurumirim Reservoir. The results show that even at low T\u2010Hg concentrations in sediment and water, concentrations in fish can reach values that pose concerns for consumption. This emphasizes the importance of designing an optimized biomonitoring program that can provide warning of biogeochemical conditions that promote formation of MeHg.<\/jats:p>","DOI":"10.2134\/jeq2005.0407","type":"journal-article","created":{"date-parts":[[2007,3,1]],"date-time":"2007-03-01T23:15:04Z","timestamp":1172790904000},"page":"478-486","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Mercury Distribution in Medium\u2010Size Rivers and Reservoirs of the S\u00e3o Paulo State (Southeast Brazil)"],"prefix":"10.1002","volume":"36","author":[{"given":"Andr\u00e9a Cristina","family":"Tomazelli","sequence":"first","affiliation":[{"name":"Faculdade de Filosofia, Ci\u00eancias e Letras de Ribeir\u00e3o Preto, Dep. de Biologia Av. dos Bandeirantes, 3900\u2010CEP 14040\u2010901 Ribeir\u00e3o Preto SP Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luiz Antonio","family":"Martinelli","sequence":"additional","affiliation":[{"name":"Centro de Energia Nuclear na Agricultura USP Piracicaba SP Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Francisco Jos\u00e9","family":"Krug","sequence":"additional","affiliation":[{"name":"Centro de Energia Nuclear na Agricultura USP Piracicaba SP Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dario","family":"Santos","sequence":"additional","affiliation":[{"name":"Centro de Energia Nuclear na Agricultura USP Piracicaba SP Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Iolanda","family":"Ruffini","sequence":"additional","affiliation":[{"name":"Centro de Energia Nuclear na Agricultura USP Piracicaba SP Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pl\u00ednio","family":"Barbosa de Camargo","sequence":"additional","affiliation":[{"name":"Centro de Energia Nuclear na Agricultura USP Piracicaba SP Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Milena","family":"Horvat","sequence":"additional","affiliation":[{"name":"Dep. of Environmental Sciences Jo\u017eef Stefan Institute Ljubljana Slovenia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2007,3]]},"reference":[{"key":"e_1_2_7_2_1","volume-title":"Ag\u00eancia Nacional de Vigil\u00e2ncia Sanit\u00e1ria","author":"ANVISA","year":"1998"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/0048-9697(95)04906-1"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0043-1354(98)00438-2"},{"key":"e_1_2_7_5_1","doi-asserted-by":"crossref","first-page":"109","DOI":"10.1016\/S0048-9697(98)00081-3","article-title":"Diffuse and point source mercury inputs to the Mississipi, Minnesota, and St. Croix Rivers","volume":"213","author":"Balogh S.","year":"1998","journal-title":"Sci. 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