naa a22 4500 510750524 CHVBK 20180411083102.0 cr unu---uuuuu 180411e20130301xx s 000 0 eng 10.1007/s11270-013-1487-3 doi (NATIONALLICENCE)springer-10.1007/s11270-013-1487-3 Using Epiphytic Lichens to Monitor Nitrogen Deposition Near Natural Gas Drilling Operations in the Wind River Range, WY, USA [Elektronische Daten] [Jill McMurray, Dave Roberts, Mark Fenn, Linda Geiser, Sarah Jovan] Rapid expansion of natural gas drilling in Sublette County, WY (1999-present), has raised concerns about the potential ecological effects of enhanced atmospheric nitrogen (N) deposition to the Wind River Range (WRR) including the Class I Bridger Wilderness. We sampled annual throughfall (TF) N deposition and lichen thalli N concentrations under forest canopies in four different drainages of the WRR. Measurements of TF N deposition and N concentrations in lichen thalli were highest at plots closest to drilling operations (<30km). N concentrations in lichens decreased exponentially with distance from drilling activity. Highest TF N deposition, 4.1kg ha−1 year−1, coincided with clear evidence of damage to lichen thalli. This deposition value is above estimated preindustrial deposition conditions (0.9kg N ha−1 year−1) and regional critical loads (a deposition value below which ecosystem harm is prevented) of N deposition for sensitive ecosystem components. N concentrations in Usnea lapponica were strongly correlated (r = 0.96) with TF N deposition, demonstrating that elemental analysis of lichen material can be used to estimate TF N deposition. N concentrations below 1.35% in U. lapponica and 1.12% in Letharia vulpina were associated with estimated background conditions of 0.9kg N ha−1 year−1. Additional lichen sampling in the Bridger Wilderness is recommended to further quantify and monitor spatial patterns of N deposition and to define areas of elevated N deposition. Springer Science+Business Media Dordrecht (outside the USA), 2013 Oil and gas development nationallicence Lichens nationallicence Throughfall nitrogen deposition nationallicence Critical loads nationallicence Monitoring nationallicence Wilderness nationallicence McMurray Jill U.S. Forest Service, Northern and Intermountain Region, Air Resources Management Program, 59711, Bozeman, MT, USA aut Roberts Dave Department of Ecology, Montana State University, 59717, Bozeman, MT, USA aut Fenn Mark US Forest Service, Pacific Southwest Research Station, 92507, Riverside, CA, USA aut Geiser Linda U.S. Forest Service, Pacific Northwest Region Air, Resources Management Program, Corvallis, OR, USA aut Jovan Sarah US Forest Service, Pacific Northwest Research Station, 97205, Portland, OR, USA aut Water, Air, & Soil Pollution Springer Netherlands 224/3(2013-03-01), 1-14 0049-6979 224:3<1 2013 224 11270 https://doi.org/10.1007/s11270-013-1487-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-013-1487-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- McMurray Jill U.S. Forest Service, Northern and Intermountain Region, Air Resources Management Program, 59711, Bozeman, MT, USA aut NATIONALLICENCE 700 1- Roberts Dave Department of Ecology, Montana State University, 59717, Bozeman, MT, USA aut NATIONALLICENCE 700 1- Fenn Mark US Forest Service, Pacific Southwest Research Station, 92507, Riverside, CA, USA aut NATIONALLICENCE 700 1- Geiser Linda U.S. Forest Service, Pacific Northwest Region Air, Resources Management Program, Corvallis, OR, USA aut NATIONALLICENCE 700 1- Jovan Sarah US Forest Service, Pacific Northwest Research Station, 97205, Portland, OR, USA aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/3(2013-03-01), 1-14 0049-6979 224:3<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer