File:Seabird ornitheutrophication coupling.png
Size of this preview: 800 × 531 pixels. Other resolutions: 320 × 212 pixels | 640 × 425 pixels | 997 × 662 pixels.
Original file (997 × 662 pixels, file size: 733 KB, MIME type: image/png)
File information
Structured data
Captions
Summary edit
DescriptionSeabird ornitheutrophication coupling.png |
English: Seabird ornitheutrophication coupling. Schematic summary of processes coupling local and regional environmental effects in seabird colonies. Colonies can be considered as nutrient hot spots, especially, for N and P. Nitrogen is the key nutrient in marine environments and phosphorous in continental waters. Both are found in high concentrations in seabird feces. Uric acid is the dominant N compound, and during its mineralization different N forms are produced: (1) ammonification produces NH3 and NH4+, and (2) nitrification produces NO3− by NH4+ oxidation. Under the alkaline conditions, typical of the seabird feces, the NH3 is rapidly volatized (3) and transformed to NH4+, which is transported out of the colony, and through wet-deposition exported to distant ecosystems, which are eutrophized (4). Similarly, nutrients in the colony can be leached and transported out through runoff and groundwater seepage (5), generating in cases (4) and (5) environmental impacts at the regional level. On the other hand, NH4+ in soil (ornithogenic soils) can be adsorbed by organominerals and remain as an exchangeable cation (panel a). The soil NH4+ in the colony can be oxidized to nitrate through nitrification processes, and rapidly washed to subterranean or superficial waters, eutrophizing nearby ecosystems (local impact, 5). In both cases, the NO3− and NH4+ can reach creeks and small lakes, eutrophizing them (regional impact). Phosphorus cycle is simpler and has a rather reduced mobility. This element is found in a number of chemical forms in the seabird fecal material, but the most mobile and bioavailable is orthophosphate (HPO4=), which can be lixiviated (solubilized) to subterranean or superficial waters (5). However, an important fraction of the P can be adsorbed by Fe/Al oxyhydroxides in acidic soils. Through erosion, these colloids can reach anoxic freshwater or estuarine sediments, where P is liberated to the water column by the reductive dissolution of Fe(III) oxyhydroxides (panel b). If the colloids reach oxic marine sediments, P can still be liberated to the water by alkaline desorption (panel c), a process that involves changes in the surface charge of Fe/Al oxyhydroxides. In both cases, water eutrophization is produced. |
Date | |
Source | Nature Communications |
Author | Xosé Luis Otero, Saul De La Peña-Lastra, Augusto Pérez-Alberti, Tiago Osorio Ferreira & Miguel Angel Huerta-Diaz |
Licensing edit
This file is licensed under the Creative Commons Attribution 4.0 International license.
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 09:24, 2 April 2020 | 997 × 662 (733 KB) | Epipelagic (talk | contribs) | Uploaded a work by Xosé Luis Otero, Saul De La Peña-Lastra, Augusto Pérez-Alberti, Tiago Osorio Ferreira & Miguel Angel Huerta-Diaz from [https://www.nature.com/articles/s41467-017-02446-8 ''Nature Communications''] with UploadWizard |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
File usage on other wikis
The following other wikis use this file:
- Usage on de.wikipedia.org
- Usage on en.wikipedia.org
Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Image width | 997 px |
---|---|
Image height | 662 px |