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A Look at Amazon Basin Seasonal Dynamics with the Biophysical ...

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N<strong>at</strong>ural and <strong>at</strong>hropogenic influences on <strong>the</strong> biogeochemistry of a meso-scale (75,000 km 2 )river undergoing deforest<strong>at</strong>ion in Southwest <strong>Amazon</strong> (Ji-Paraná river, Rondônia).Nei Kavaguichi Leite 1 , Alex Vladimir Krusche 1 , Maria Victoria Ballester 1 , Marcelo Bernardes 1 ,Reynaldo Victoria 2 , Be<strong>at</strong>riz Machado Gomes 3 , Anthony Aufdenkampe 2 , Jeffrey Richey 2 .1 Centro de Energia Nuclear na Agricultura - USP. Labor<strong>at</strong>ório de Ecologia Isotópica. CaixaPostal 96. CEP 13400-970. Piracicaba - Sνo Paulo - Brazil.2 School of Oceanography - University of Washington. Se<strong>at</strong>tle - WA - USA.3 Universidade Federal de Rondônia - Campus de Ji-Paraná. Ji-Paraná - Rondônia - BrazilAbstractThe rivers of <strong>the</strong> Ji-Paraná basin were sampled <strong>at</strong> seven different occasions, corresponding tovarious stages of <strong>the</strong> hydrograph. A total of 14 sampling st<strong>at</strong>ions were distributed along 7 majortributaries and <strong>the</strong> Ji-Paraná river mainstem. Sp<strong>at</strong>ially, <strong>the</strong> chemistry of tributary w<strong>at</strong>ers showedst<strong>at</strong>istically significant differences (p

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