Nitrogen dynamics in grassland streams along a gradient of agricultural development

Show simple item record Simon, Kevin en Niyogi, DK en Frew, RD en Townsend, CR en 2012-02-12T21:22:20Z en 2007-05 en
dc.identifier.citation Limnology and Oceanography 52(3):1246-1257 May 2007 en
dc.identifier.issn 0024-3590 en
dc.identifier.uri en
dc.description.abstract We examined nitrogen (N) uptake in seven grassland streams lying in catchments along a gradient (0–84%) of agricultural land use in New Zealand using a stable isotope (15N) addition of NH4+ to quantify whole-stream uptake rates and uptake by specific compartments within the streams. Whole-stream uptake of NH4+ ranged from 1.2 mmol N m-2 min-1 to 7.9 mmol N m-2 min-1 and showed no evidence of strong saturation of uptake with increasing NH4+ availability along the land use gradient. The relatively simple pattern of increasing N uptake along the gradient occurred despite substantial shifts in uptake among community members. Uptake of NH4+ by epilithic biofilms followed a subsidy–stress relationship, with highest uptake rates at intermediate levels of pastoral development and lowest uptake rates at high pastoral development. At high (>60%) pastoral development, reduced uptake by epilithon was compensated for by enhanced uptake by macrophytes. Compensatory uptake can play an important role in streams when community composition is reorganized by human activity. en
dc.language EN en
dc.publisher American Society of Limnology and Oceanography en
dc.relation.ispartofseries Limnology and Oceanography en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained from: en
dc.rights.uri en
dc.subject NEW-ZEALAND en
dc.subject LAND-USE en
dc.subject NUTRIENT-UPTAKE en
dc.subject RIVER HEALTH en
dc.subject TUSSOCK en
dc.subject ADAPTATION en
dc.subject ECOSYSTEMS en
dc.subject PHOSPHORUS en
dc.title Nitrogen dynamics in grassland streams along a gradient of agricultural development en
dc.type Journal Article en
dc.identifier.doi 10.4319/lo.2007.52.3.1246 en
pubs.issue 3 en
pubs.begin-page 1246 en
pubs.volume 52 en
dc.rights.holder Copyright: American Society of Limnology and Oceanography en
pubs.end-page 1257 en
dc.rights.accessrights en
pubs.subtype Article en
pubs.elements-id 280470 en Science en School of Environment en
pubs.record-created-at-source-date 2012-02-13 en

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