• Login
    About WHOAS
    View Item 
    •   WHOAS Home
    • Marine Biological Laboratory
    • Ecosystems Center
    • View Item
    •   WHOAS Home
    • Marine Biological Laboratory
    • Ecosystems Center
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of WHOASCommunities & CollectionsBy Issue DateAuthorsTitlesKeywordsThis CollectionBy Issue DateAuthorsTitlesKeywords

    My Account

    LoginRegister

    Statistics

    View Usage Statistics

    Amazon deforestation alters small stream structure, nitrogen biogeochemistry and connectivity to larger rivers

    Thumbnail
    View/Open
    Author's manuscript (225.2Kb)
    Supplemental material (18.96Kb)
    Figure 1 (474.2Kb)
    Figure 2 (3.690Mb)
    Figure 3 (3.323Mb)
    Figure 4 (2.722Mb)
    Figure 5 (3.096Mb)
    Figure 6 (2.993Mb)
    Figure 7 (2.669Mb)
    Date
    2010-08-29
    Author
    Deegan, Linda A.  Concept link
    Neill, Christopher  Concept link
    Haupert, Christie L.  Concept link
    Ballester, M. Victoria R.  Concept link
    Krusche, Alex V.  Concept link
    Victoria, Reynaldo L.  Concept link
    Thomas, Suzanne M.  Concept link
    de Moor, Emily  Concept link
    Metadata
    Show full item record
    Citable URI
    https://hdl.handle.net/1912/4842
    As published
    https://doi.org/10.1007/s10533-010-9540-4
    Keyword
     N-15; Ammonium uptake length; Brazil; Nitrification; Nitrogen cycling; Pasture; Stable isotopes; Stream ecosystem; Tropical forest 
    Abstract
    Human activities that modify land cover can alter the structure and biogeochemistry of small streams but these effects are poorly known over large regions of the humid tropics where rates of forest clearing are high. We examined how conversion of Amazon lowland tropical forest to cattle pasture influenced the physical and chemical structure, organic matter stocks and N cycling of small streams. We combined a regional ground survey of small streams with an intensive study of nutrient cycling using 15N additions in three representative streams: a second-order forest stream, a second-order pasture stream and a third-order pasture stream that were within several km of each other and on similar soils and landscape positions. Replacement of forest with pasture decreased stream habitat complexity by changing streams from run and pool channels with forest leaf detritus (50% cover) to grass-filled (63% cover) channel with runs of slow-moving water. In the survey, pasture streams consistently had lower concentrations of dissolved oxygen and nitrate (NO3-) compared with similar-sized forest streams. Stable isotope additions revealed that second-order pasture stream had a shorter NH4+ uptake length, higher uptake rates into organic matter components and a shorter 15NH4+ residence time than the second-order forest stream or the third-order pasture stream. Nitrification was significant in the forest stream (19% of the added 15NH4+) but not in the second-order pasture (0%) or third-order (6%) pasture stream. The forest stream retained 7% of added 15N in organic matter compartments and exported 53% (15NH4+ =34%; 15NO3- = 19%). In contrast, the second-order pasture stream retained 75% of added 15N, predominantly in grasses (69%) and exported only 4% as 15NH4+. The fate of tracer 15N in the third-order pasture stream more closely resembled that in the forest stream, with 5% of added N retained and 26% exported (15NH4+ = 9%; 15NO3- = 6%). These findings indicate that the widespread infilling by grass in small streams in areas deforested for pasture greatly increases the retention of inorganic N in the first- and second-order streams, which make up roughly three-fourths of total stream channel length in Amazon basin watersheds. The importance of this phenomenon and its effect on N transport to larger rivers across the larger areas of the Amazon Basin will depend on better evaluation of both the extent and the scale at which stream infilling by grass occurs, but our analysis suggests the phenomenon is widespread.
    Description
    Author Posting. © The Author(s), 2010. This is the author's version of the work. It is posted here by permission of Springer for personal use, not for redistribution. The definitive version was published in Biogeochemistry 105 (2011): 53-74, doi:10.1007/s10533-010-9540-4.
    Collections
    • Ecosystems Center
    Suggested Citation
    Preprint: Deegan, Linda A., Neill, Christopher, Haupert, Christie L., Ballester, M. Victoria R., Krusche, Alex V., Victoria, Reynaldo L., Thomas, Suzanne M., de Moor, Emily, "Amazon deforestation alters small stream structure, nitrogen biogeochemistry and connectivity to larger rivers", 2010-08-29, https://doi.org/10.1007/s10533-010-9540-4, https://hdl.handle.net/1912/4842
     

    Related items

    Showing items related by title, author, creator and subject.

    • Thumbnail

      Pacific Ocean–wide profile of CYP1A1 expression, stable carbon and nitrogen isotope ratios, and organic contaminant burden in sperm whale skin biopsies 

      Godard-Codding, Celine A. J.; Clark, Rebecca; Fossi, Maria Cristina; Marsili, Letizia; Maltese, Silvia; West, Adam G.; Valenzuela, Luciano; Rowntree, Victoria; Polyak, Ildiko; Cannon, John C.; Pinkerton, Kim; Rubio-Cisneros, Nadia; Mesnick, Sarah L.; Cox, Stephen B.; Kerr, Iain; Payne, Roger; Stegeman, John J. (National Institute of Environmental Health Sciences, 2010-12-06)
      Background: Ocean pollution affects marine organisms and ecosystems as well as humans. The International Oceanographic Commission recommends ocean health monitoring programs to investigate the presence of marine contaminants ...
    • Thumbnail

      Quantifying the production of dissolved organic nitrogen in headwater streams using 15N tracer additions 

      Johnson, Laura T.; Tank, Jennifer L.; Hall, Robert O.; Mulholland, Patrick J.; Hamilton, Stephen K.; Valett, H. Maurice; Webster, Jackson R.; Bernot, Melody J.; McDowell, William H.; Peterson, Bruce J.; Thomas, Suzanne M. (Association for the Sciences of Limnology and Oceanography, 2013-07)
      Most nitrogen (N) assimilation in lake and marine ecosystems is often subsequently released via autochthonous dissolved organic nitrogen (DON) production, but autochthonous DON production has yet to be quantified in flowing ...
    • Thumbnail

      Larval settlement in flocculated particulates 

      Zimmer, Cheryl Ann; Starczak, Victoria R.; Arch, Victoria S.; Zimmer, Richard K. (Sears Foundation for Marine Research, 2008-03)
      Planktonic larval settlement can be a major determinant of population and community dynamics. Settlement templates of benthic invertebrates have been attributed to biological, chemical, and hydrodynamic mechanisms. Completely ...
    All Items in WHOAS are protected by original copyright, with all rights reserved, unless otherwise indicated. WHOAS also supports the use of the Creative Commons licenses for original content.
    A service of the MBLWHOI Library | About WHOAS
    Contact Us | Send Feedback | Privacy Policy