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dc.contributor.authorMulholland, P. J.-
dc.contributor.authorFellows, C. S.-
dc.contributor.authorTank, J. L.-
dc.contributor.authorGrimm, Nancy B.-
dc.contributor.authorWebster, J. R.-
dc.contributor.authorHamilton, S. K.-
dc.contributor.authorMartí, Eugènia-
dc.contributor.authorAshkenas, L.-
dc.contributor.authorBowden, W. B.-
dc.contributor.authorDodds, W. K.-
dc.contributor.authorMcDowell, W. H.-
dc.contributor.authorPaul, M. J.-
dc.contributor.authorPeterson, Bruce J.-
dc.date.accessioned2011-06-28T11:15:08Z-
dc.date.available2011-06-28T11:15:08Z-
dc.date.issued2008-07-07-
dc.identifier.citationFreshwater Biology 46(11) : 1503-1517 (2001)es_ES
dc.identifier.issn0046-5070-
dc.identifier.urihttp://hdl.handle.net/10261/37240-
dc.description14 Páginas ; 6 Figuras ; 2 Tablases_ES
dc.description.abstract1. We studied whole-ecosystem metabolism in eight streams from several biomes in North America to identify controls on the rate of stream metabolism over a large geographic range. The streams studied had climates ranging from tropical to cool-temperate and from humid to arid and were all relatively uninfluenced by human disturbances. 2. Rates of gross primary production (GPP), ecosystem respiration (R) and net ecosystem production (NEP) were determined using the open-system, two-station diurnal oxygen change method. 3. Three general patterns in metabolism were evident among streams: (1) relatively high GPP with positive NEP (i.e. net oxygen production) in early afternoon, (2) moderate primary production with a distinct peak in GPP during daylight but negative NEP at all times and (3) little or no evidence of GPP during daylight and a relatively constant and negative NEP over the entire day. 4. Gross primary production was most strongly correlated with photosynthetically active radiation (PAR). A multiple regression model that included log PAR and stream water soluble reactive phosphorus (SRP) concentration explained 90% of the variation in log GPP. 5. Ecosystem respiration was significantly correlated with SRP concentration and size of the transient storage zone and, together, these factors explained 73% of the variation in R. The rate of R was poorly correlated with the rate of GPP. 6. Net ecosystem production was significantly correlated only with PAR, with 53% of the variation in log NEP explained by log PAR. Only Sycamore Creek, a desert stream in Arizona, had positive NEP (GPP: R > 1), supporting the idea that streams are generally net sinks rather than net sources of organic matter. 7. Our results suggest that light, phosphorus concentration and channel hydraulics are important controls on the rate of ecosystem metabolism in streams over very extensive geographic areas.es_ES
dc.description.sponsorshipThe Ecosystems Program, National Science Foundation, to Virginia Tech (DEB-9628860). The research was conducted in part on the Oak Ridge National Environmental Research Park, Environmental Sciences Division, Office of Biological and Environmental Research, U.S. Department of Energy under contract DE-AC05–00OR2725 with University of Tennessee-Battelle LLC.es_ES
dc.language.isoenges_ES
dc.publisherJohn Wiley & Sonses_ES
dc.rightsclosedAccesses_ES
dc.subjectInter-biomees_ES
dc.subjectMetabolismes_ES
dc.subjectPrimary productiones_ES
dc.subjectRespirationes_ES
dc.subjectStreames_ES
dc.titleInter-biome comparison of factors controlling stream metabolismes_ES
dc.typeartículoes_ES
dc.identifier.doi10.1046/j.1365-2427.2001.00773.x-
dc.description.peerreviewedPeer reviewedes_ES
dc.relation.publisherversionhttp://dx.doi.org/10.1046/j.1365-2427.2001.00773.xes_ES
dc.type.coarhttp://purl.org/coar/resource_type/c_6501es_ES
item.openairetypeartículo-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextnone-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextNo Fulltext-
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