English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/88841
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Title

High metabolic rates in beach cast communities

AuthorsCoupland, Grey T.; Duarte, Carlos M. ; Walker, Diana I.
Issue Date2007
PublisherSpringer
CitationEcosystems 10(8): 1341-1350 (2007)
AbstractMetabolic hotspots at land-water interfaces are important in supporting biogeochemical processes. Here we confirm the generality of land-aquatic interfaces as biogeochemical hot spots by extending this concept to marine beach cast materials. In situ atmospheric pCO2, from a respiration chamber (10 cm in diameter and 20 cm high) inserted into wrack deposits, was determined using a high-precision (±1 ppm) non-dispersive infrared gas analyzer (EGM-4, PP-systems) at 1 minute recording intervals. The wrack deposits supported high metabolic activities, with CO2 fluxes averaging (±SE) 6.62 ± 0.88 μmol C m-2 s-1, compared to median value of 0.98 μmol C m-2 s-1 (mean 2.21 ± 1.25 μmol C m-2 s-1) for bare sand adjacent to deposits. Wrack metabolic rates ranged 40-fold across beaches, from a minimum of 0.57 ± 0.22 μmol C m-2 s-1 to a maximum of 20.8 ± 5.04 μmol C m-2 s-1, both derived from beaches with deposits dominated by Sargassum. Rates tended to increase significantly (F test, P < 0.05) from the shoreline to reach maximum rates at about 10 m from the shoreline, declining sharply further from the shoreline, and increased with increasing thickness of the deposits (maximum about 10 cm deep), declining for thicker deposits. Wrack differing in composition had similar metabolic rates, although deposits consisting of a mixture of seagrass and algae tended to show somewhat higher rates. Our results show a meter square of wrack deposit supports a metabolic rate equivalent to that supported by 3 m2 of living seagrass or macroalgal habitat. In wrack, the marine environment provides organic material and moisture and the land environment provides oxygen to render wrack ecosystems an efficient metabolic reactor. Intense wrack metabolism should also be conducive to organismal growth by supporting the development of a cryptic, but diverse wrack-based food web. © 2007 Springer Science+Business Media, LLC.
URIhttp://hdl.handle.net/10261/88841
DOI10.1007/s10021-007-9102-3
Identifiersdoi: 10.1007/s10021-007-9102-3
issn: 1432-9840
Appears in Collections:(IMEDEA) Artículos
Files in This Item:
File Description SizeFormat 
accesoRestringido.pdf15,38 kBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.