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Phosphorus transpor...
Phosphorus transport by the largest Amazon tributary (Madeira River, Brazil) and its sensitivity to precipitation and damming
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Almeida, Rafael M. (author)
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- Tranvik, Lars (author)
- Uppsala universitet,Limnologi
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Huszar, Vera L. M. (author)
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- Sobek, Sebastian (author)
- Uppsala universitet,Limnologi
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- Mendonca, Raquel (author)
- Uppsala universitet,Limnologi
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Barros, Nathan (author)
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Boemer, Gina (author)
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Arantes, Joao Durval, Jr. (author)
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Roland, Fabio (author)
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(creator_code:org_t)
- 2015
- 2015
- English.
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In: Inland Waters. - 2044-2041 .- 2044-205X. ; 5:3, s. 275-282
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https://uu.diva-port... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.5...
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Abstract
Subject headings
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- Originating in the Bolivian and Peruvian Andes, the Madeira River is the largest tributary of the Amazon River in terms of discharge. Andean rivers transport large quantities of nutrient-rich suspended sediments and are the main source of phosphorus (P) to the Amazon basin. Here, we show the seasonal variability in concentrations and loads of different P forms (total, particulate, dissolved, and soluble reactive P) in the Madeira River through 8 field campaigns between 2009 and 2011. At our sampling reach in Porto Velho, Brazil, the Madeira River transports similar to 177-247 Gg yr(-1) of P, mostly linked to particles (similar to 85%). Concentrations and loads of all P forms have a maximum at rising waters and a minimum at low waters. Total P concentrations were substantially higher at a given discharge at rising water than at a similar discharge at falling water. The peak of P concentrations matched the peak of rainfall in the upper basin, suggesting an influence of precipitation-driven erosion. Projected precipitation increase in the eastern slopes of the Andes could enhance sediment yield and hence the P transport in the Madeira River. Because most of the P is particulate, however, we hypothesize that the planned proliferation of hydropower dams in the Madeira basin has the potential to reduce P loads substantially, possibly counteracting any precipitation-related increases. In the long term, this could be detrimental to highly productive downstream floodplain forests that are seasonally fertilized with P-rich deposits.
Subject headings
- NATURVETENSKAP -- Biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences (hsv//eng)
Keyword
- Amazon
- Andes
- floodplain
- hydropower dams
- Madeira River
- phosphorus
- precipitation
Publication and Content Type
- ref (subject category)
- art (subject category)
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