Negro, River

Arribere MA, Guevara SR, Sanchez RS, Gil MI, Ross GR, Daurade LE, Fajon V, Horvat M, Alcalde R, Kestelman AJ (2003) Heavy metals in the vicinity of a chlor-alkali factory in the upper Negro River ecosystem, Northern Patagonia, Argentina. Sci Total Environ 301 187-203... 

In principle, the records at Obidos should reflect the rainfall regimes from the Negro River, together with the Solimoes, Madeira and Pums. Chu (1982) found that two thirds of water level variability of the Amazon River at Manaus can be explained by the volume of... 

For the igapo forest no figures on biomass wood production are available. The low figures for litterfall and radial wood growth indicate that this ecosystem is very unproductive. There is no nutrient input from the nutrient- and sediment-poor water of the Negro River. 

Most limnological studies have been completed near the confluence of the Solimoes and Negro rivers, which combine at Manaus to form the Amazon River. These rivers are biogeochemically distinct systems. The Solimoes River, called a whitewater river, is rich in dissolved nutrients and suspended sediments and has extensive, fertile flood-plains. The Negro River is nutrient poor and contains high concentrations of dissolved organic carbon, hence it is called a black-water river. 

Throughfall and litterfall from flooded forests represent a complex aspect of nutrient dynamics in floodplain lakes that has received little attention. Filoso (1996) measured wet deposition and throughfall from igapo forest of the Anavilhanas archipelago in the lower Negro River, and calculated that about two thirds of the rain that fell on floodplain lakes in the Anavilhanas was influenced by flooded forest canopy. The deposition of dissolved P increased about seven times after rain was... 

Figure 14.9 Historic increase in mercury concentration in sediments of Lake Cristalino, located on the shore of the lower Negro River. B. R. Forsberg and E. Campos, unpublished data.

Filoso, S. 1996. Throughfall and aquatic biogeochemistry in the Anavilhanas archipelago, Negro River, Brazil. Ph.D. Thesis. University of California, Santa Barbara, p. 187. 

Filoso, S., M. R. Williams and Jim Malade. 1999. Composition and deposition of throughfall in a flooded forest archipelago (Anavilhanas, Negro River, Brazil). Biogeochemistry 45 169-195. 

Figure 16.8 Mass proportions of trace element transported as dissolved and particulate forms in the Solimoes River at Manacapuru, in the Negro River at Paricatuba (Manaus), and in the Amazon River at Obidos.

Campina- / CaatiiujH j 1 1 — Negro River 1 1 LOWLAND SHIELD... 

Normal soils in France contained 0.13-0.16 mg kg silver, and soils around smelters 0.25-2.38 mg kg (Sterckeman etal. 2002). Contaminated sediments and soils in a river environment in Syria contained 6.7-18.3 mg kg and 0.90-3.56 mg kg respectively (Khamis et al. 2002). Silver contents in plurial and city sewage collectors in the vicinity of a chlor-alkali-factory in the upper Negro River ecosystem, Argentina contained 2.6-9.5 mg kg Ag (Arribere etal. 2003). 

Calabash curare is produced from Strychnos toxifera and related plants of the same genus [1]. Calabash curare is named after its container, and is used by the indigenous peoples of the Rio-Negro river, and in the upper reaches of the Orinoco river. 

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