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Filter Total Items: 158
Year Published: 2012

Field information links permafrost carbon to physical vulnerabilities of thawing

Deep soil profiles containing permafrost (Gelisols) were characterized for organic carbon (C) and total nitrogen (N) stocks to 3m depths. Using the Community Climate System Model (CCSM4) we calculate cumulative probability functions (PDFs) for active layer depths under current and future climates. The difference in PDFs over time was multiplied by...

Harden, Jennifer W.; Koven, Charles; Ping, Chien-Lu; Hugelius, Gustaf; McGuire, A. David; Camill, P.; Jorgenson, Torre; Kuhry, Peter; Michaelson, Gary; O'Donnell, Jonathan A.; Schuur, Edward A.G.; Tamocai, Charles; Johnson, K.; Grosse, G.
Field information links permafrost carbon to physical vulnerabilities of thawing; 2012; Article; Journal; Geophysical Research Letters; Harden, Jennifer W.; Koven, Charles ; Ping, Chien-Lu ; Hugelius, Gustaf ; McGuire, A. David; Camill, P. ; Jorgenson, Torre ; Kuhry, Peter ; Michaelson, Gary ; O'Donnell, Jonathan A.; Schuur, Edward A. G.; Tamocai, Charles ; Johnson, K. ; Grosse, G.

Year Published: 2012

An assessment of the carbon balance of arctic tundra: comparisons among observations, process models, and atmospheric inversions

Although arctic tundra has been estimated to cover only 8% of the global land surface, the large and potentially labile carbon pools currently stored in tundra soils have the potential for large emissions of carbon (C) under a warming climate. These emissions as radiatively active greenhouse gases in the form of both CO2 and CH4 could amplify...

McGuire, A.D.; Christensen, T.R.; Hayes, D.; Heroult, A.; Euskirchen, E.; Yi, Y.; Kimball, J.S.; Koven, C.; Lafleur, P.; Miller, P.A.; Oechel, W.; Peylin, P.; Williams, M.
An assessment of the carbon balance of arctic tundra: comparisons among observations, process models, and atmospheric inversions; 2012; Article; Journal; Biogeosciences; McGuire, A. D.; Christensen, T. R.; Hayes, D. ; Heroult, A. ; Euskirchen, E. ; Yi, Y. ; Kimball, J. S.; Koven, C. ; Lafleur, P. ; Miller, P. A.; Oechel, W. ; Peylin, P. ; Williams, M.

Year Published: 2012

Wetland selection by breeding and foraging black terns in the Prairie Pothole Region of the United States

We examined wetland selection by the Black Tern (Chlidonias niger), a species that breeds primarily in the prairie pothole region, has experienced population declines, and is difficult to manage because of low site fidelity. To characterize its selection of wetlands in this region, we surveyed 589 wetlands throughout North and South Dakota. We...

Steen, Valerie A.; Powell, Abby N.
Wetland selection by breeding and foraging black terns in the Prairie Pothole Region of the United States; 2012; Article; Journal; The Condor; Steen, Valerie A.; Powell, Abby N.

Year Published: 2012

Brook trout movement in response to temperature, flow, and thermal refugia within a complex Appalachian riverscape

We quantified movements of brook trout Salvelinus fontinalis and brown trout Salmo trutta in a complex riverscape characterized by a large, open-canopy main stem and a small, closed-canopy tributary in eastern West Virginia, USA. Our objectives were to quantify the overall rate of trout movement and relate movement behaviors to variation in...

Petty, J. Todd; Hansbarger, Jeff L.; Huntsman, Brock M.; Mazik, Patricia M.

Year Published: 2012

Reconciling estimates of the contemporary North American carbon balance among terrestrial biosphere models, atmospheric inversions, and a new approach for estimating net ecosystem exchange from inventory-based data

We develop an approach for estimating net ecosystem exchange (NEE) using inventory-based information over North America (NA) for a recent 7-year period (ca. 2000–2006). The approach notably retains information on the spatial distribution of NEE, or the vertical exchange between land and atmosphere of all non-fossil fuel sources and sinks of...

Hayes, Daniel J.; Turner, David P.; Stinson, Graham; McGuire, A. David; Wei, Yaxing; West, Tristram O.; Heath, Linda S.; de Jong, Bernardus; McConkey, Brian G.; Birdsey, Richard A.; Kurz, Werner A.; Jacobson, Andrew R.; Huntzinger, Deborah N.; Pan, Yude; Post, W. Mac; Cook, Robert B.
Reconciling estimates of the contemporary North American carbon balance among terrestrial biosphere models, atmospheric inversions, and a new approach for estimating net ecosystem exchange from inventory-based data; 2012; Article; Journal; Global Change Biology; Hayes, Daniel J.; Turner, David P.; Stinson, Graham; McGuire, A. David; Wei, Yaxing; West, Tristram O.; Heath, Linda S.; de Jong, Bernardus; McConkey, Brian G.; Birdsey, Richard A.; Kurz, Werner A.; Jacobson, Andrew R.; Huntzinger, Deborah N.; Pan, Yude ; Post, W. Mac; Cook, Robert B.

Year Published: 2012

Quantity, structure, and habitat selection of natural spawning reefs by walleyes in a north temperate lake: A multiscale analysis

Spawning habitat, the cornerstone of self-sustaining, naturally reproducing walleyeSander vitreus populations, has received limited quantitative research. Our goal was to quantitatively describe the structure and quantity of natural walleye spawning habitat and evaluate potential selection of habitat in Big Crooked Lake, Wisconsin. In 2004...

Raabe, Joshua K.; Bozek, Michael A.

Year Published: 2012

Diet of non-native northern snakehead (Channa argus) compared to three co-occurring predators in the lower Potomac River, USA

Introductions of large, non-native, carnivorous fishes continue to occur worldwide and represent a substantial management concern to global biodiversity. One of the most recent non-native fishes to successfully establish in North America is the northern snakehead (Channa argus), found in the lower Potomac River catchment. Dispersal of the northern...

Ryan K. Saylor; Nicolas W.R. Laointe; Angermeier, Paul

Year Published: 2012

Effects of brood parasitism by brown-headed cowbirds may persist in the post fledging period

Brood parasitism by Brown-headed Cowbirds (Molothrus ater) typically decreases the number of host juveniles that fledge: however, little information exists regarding the effect of cowbird parasitism during the post-fledging period. We monitored 115 Ovenbird (Seiurus aurocapilla) nests in 2006–2008 in northcentral Minnesota, six of which were...

Peterson, Sean M.; Streby, Henry M.; Andersen, David E.

Year Published: 2012

Spatial and temporal diet patterns of subadult and small adult striped bass in Massachusetts estuaries: Data, a synthesis, and trends across scales

Subadult and small adult (375–475 mm total length) striped bass Morone saxatilis are abundant and represent an important component of the recovered U.S. Atlantic coast stocks. However, little is known about these large aggregations of striped bass during their annual foraging migrations to New England. A quantitative understanding of trends...

Ferry, K.H.; Mather, Martha E.

Year Published: 2011

Seasonal productivity in a population of migratory songbirds: why nest data are not enough

Population models for many animals are limited by a lack of information regarding juvenile survival. In particular, studies of songbird reproductive output typically terminate with the success or failure of nests, despite the fact that adults spend the rest of the reproductive season rearing dependent fledglings. Unless fledgling survival does not...

Streby, Henry M.; Andersen, David E.

Year Published: 2011

Evaluating trapping techniques to reduce potential for injury to Mexican wolves

Increased scrutiny of furbearer trapping has resulted in more regulation and even prohibition of common trapping methods in some States. Concerns regarding the potential negative impacts of regulated furbearer trapping on reintroduced Mexican gray wolves (Canis lupus baileyi) led now former Governor Bill Richardson to issue an executive order...

Turnbull, T.T.; Cain, J.W.; Roemer, G.W.
Evaluating trapping techniques to reduce potential for injury to Mexican wolves; 2011; OFR; 2011-1190; Turnbull, T.T.; Cain, J.W. III; Roemer, G.W.

Year Published: 2011

Use of early-successional managed northern forest by mature-forest species during the post-fledging period

In eastern North America, after the young fledge, both adult and juvenile mature-forest birds may use regenerating clearcuts, although which species frequent early-successional forest and during which life stages is not well documented. To assess whether birds nesting in mature forest in north-central Minnesota use regenerating clearcuts 2...

Streby, Henry M.; Peterson, Sean M.; McAllister, Tara L.; Andersen, David E.