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dc.contributor.authorTerrados, Jorge-
dc.contributor.authorWilliams, Susan L.-
dc.date.accessioned2009-02-27T12:50:43Z-
dc.date.available2009-02-27T12:50:43Z-
dc.date.issued1997-04-10-
dc.identifier.citationMarine Ecology Progress Series (MEPS) 149: 267-277 (1997)en_US
dc.identifier.issn0171-8630-
dc.identifier.urihttp://hdl.handle.net/10261/11091-
dc.description11 pages, 6 figures.en_US
dc.description.abstractPhyllospadix torreyi S. Watson ('surfgrass') is one of very few seagrass species that grow on rocks. Thus, unlike most other seagrasses, nutrient uptake across leaves rather than across roots might be very important for nutrient acquisition. Ammonium and nitrate+nitrite uptake by surfgrass leaves was measured under flowing water and modelled (Michaelis-Menten) as a function of external concentrations. Leaf NH4+ uptake showed a Km of 17.4 µM and a Vmax of 125.1 µmol N g dry wt(-1) h(-1). Km and Vmax values for leaf NO3- + NO2- uptake were 10.1 µM and 54.5 µmol N g dry wt(-1) h(-1), respectively. Ammonium available to the roots had little discernible effect on NH4+ uptake by leaves. Low NH4+ uptake rates by roots (<0.2 µmol N g dry wt(-1) h(-1) suggest that surfgrass acquires most of its nitrogen via its leaves.en_US
dc.description.sponsorshipThis study was funded by the Ministerio de Educación y Ciencia, Programa de Becas de Formación de Personal Investigador en el Extranjero through a fellowship awarded to J.T.en_US
dc.format.extent1027319 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoengen_US
dc.publisherInter Researchen_US
dc.rightsopenAccessen_US
dc.subjectAmmoniumen_US
dc.subjectNitrateen_US
dc.subjectLeaf uptakeen_US
dc.subjectRoot uptakeen_US
dc.subjectPhyllospadixen_US
dc.subjectSeagrassesen_US
dc.titleLeaf versus root nitrogen uptake by the surfgrass Phyllospadix torreyien_US
dc.typeartículoen_US
dc.identifier.doihttp://dx.doi.org/10.3354/meps149267-
dc.description.peerreviewedPeer revieweden_US
dc.relation.publisherversionhttp://dx.doi.org/10.3354/meps149267en_US
dc.identifier.e-issn1616-1599-
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