Show simple item record

dc.contributor.authorNorthington, Robert M.en_US
dc.contributor.authorWebster, Jackson R.en_US
dc.contributor.authorBenfield, Ernest F.en_US
dc.contributor.authorCheever, Beth M.en_US
dc.contributor.authorNiederlehner, Barbara R.en_US
dc.date.accessioned2018-10-22T14:05:15Z
dc.date.available2018-10-22T14:05:15Z
dc.date.issued2013-04-22en_US
dc.identifier.othere61171en_US
dc.identifier.urihttp://hdl.handle.net/10919/85441
dc.description.abstractForested ecosystems in the southeastern United States are currently undergoing an invasion by the hemlock woolly adelgid (HWA). Previous studies in this area have shown changes to forest structure, decreases in canopy cover, increases in organic matter, and changes to nutrient cycling on the forest floor and soil. Here, we were interested in how the effects of canopy loss and nutrient leakage from terrestrial areas would translate into functional changes in streams draining affected watersheds. We addressed these questions in HWA-infested watersheds at the Coweeta Hydrologic Laboratory in North Carolina. Specifically, we measured stream metabolism (gross primary production and ecosystem respiration) and nitrogen uptake from 2008 to 2011 in five streams across the Coweeta basin. Over the course of our study, we found no change to in-stream nutrient concentrations. While canopy cover decreased annually in these watersheds, this change in light penetration did not translate to higher rates of in-stream primary production during the summer months of our study. We found a trend towards greater heterotrophy within our watersheds, where in-stream respiration accounted for a much larger component of net ecosystem production than GPP. Additionally, increases in rhododendron cover may counteract changes in light and nutrient availability that occurred with hemlock loss. The variability in our metabolic and uptake parameters suggests an actively-infested ecosystem in transition between steady states.en_US
dc.format.mimetypeapplication/pdfen_US
dc.language.isoen_USen_US
dc.publisherPLOSen_US
dc.rightsCreative Commons Attribution 4.0 Internationalen_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0en_US
dc.titleEcosystem Function in Appalachian Headwater Streams during an Active Invasion by the Hemlock Woolly Adelgiden_US
dc.typeArticle - Refereeden_US
dc.description.versionPeer Revieweden_US
dc.title.serialPLOS ONEen_US
dc.identifier.doihttps://doi.org/10.1371/journal.pone.0061171en_US
dc.identifier.volume8en_US
dc.identifier.issue4en_US
dc.type.dcmitypeTexten_US
dc.identifier.pmid23613803en_US
dc.identifier.eissn1932-6203en_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record

Creative Commons Attribution 4.0 International
License: Creative Commons Attribution 4.0 International