Jill S Baron, PhD (Former Employee)
Science and Products
Filter Total Items: 213
Hindcasting nitrogen deposition to determine an ecological critical load Hindcasting nitrogen deposition to determine an ecological critical load
Using an estimated background nitrogen (N) deposition value of 0.5 kg N·ha−1·yr−1 in 1900, and a 19-year record of measured values from Loch Vale (Colorado, USA; NADP site CO98), I reconstructed an N-deposition history using exponential equations that correlated well with EPA-reported NOx emissions from Colorado and from the sum of emissions of 11 western states. The mean wet N...
Authors
Jill Baron
Ecological thresholds: The key to successful enviromental management or an important concept with no practical application? Ecological thresholds: The key to successful enviromental management or an important concept with no practical application?
An ecological threshold is the point at which there is an abrupt change in an ecosystem quality, property or phenomenon, or where small changes in an environmental driver produce large responses in the ecosystem. Analysis of thresholds is complicated by nonlinear dynamics and by multiple factor controls that operate at diverse spatial and temporal scales. These complexities have...
Authors
P.M. Groffman, Jill Baron, T. Blett, A.J. Gold, I. Goodman, L.H. Gunderson, B.M. Levinson, Margaret A. Palmer, H.W. Paerl, G.D. Peterson, N.L. Poff, D.W. Rejeski, J.F. Reynolds, M.G. Turner, K.C. Weathers, J. Wiens
Aggregate measures of ecosystem services: Can we take the pulse of nature? Aggregate measures of ecosystem services: Can we take the pulse of nature?
National scale aggregate indicators of ecosystem services are useful for stimulating and supporting a broad public discussion about trends in the provision of these services. There are important considerations involved in producing an aggregate indicator, including whether the scientific and technological capacity exists, how to address varying perceptions of the societal importance of...
Authors
L.A. Meyerson, Jill Baron, J. Melillo, R.J. Naiman, R.I. O’Malley, G. Orians, Margaret A. Palmer, Alexander Pfaff, S. Running, O.E. Sala
High elevation ecosystem responses to atmospheric deposition of nitrogen in the Colorado Rocky Mountains, USA High elevation ecosystem responses to atmospheric deposition of nitrogen in the Colorado Rocky Mountains, USA
No abstract available.
Authors
Jill Baron, K. R. Nydick, H.M. Rueth, B. M. LaFrancois, A.P. Wolfe
Nonlinear dynamics in ecosystem response to climatic change: Case studies and policy implications Nonlinear dynamics in ecosystem response to climatic change: Case studies and policy implications
Many biological, hydrological, and geological processes are interactively linked in ecosystems. These ecological phenomena normally vary within bounded ranges, but rapid, nonlinear changes to markedly different conditions can be triggered by even small differences if threshold values are exceeded. Intrinsic and extrinsic ecological thresholds can lead to effects that cascade among...
Authors
Virginia Burkett, Douglas Wilcox, Robert Stottlemyer, Wylie Barrow, Dan Fagre, Jill Baron, Jeff Price, Jennifer Nielsen, Craig Allen, David Peterson, Greg Ruggerone, Thomas Doyle
Taking the pulse of Colorado's Front Range: Developing regional indicators of environmental and quality of life condition Taking the pulse of Colorado's Front Range: Developing regional indicators of environmental and quality of life condition
Indicators are routinely used to report the status and trends of human health, economy, educational achievement, and quality of life. Some environmental indicators, such as for water and air quality, are routinely reported and used to inform personal, management, or policy decisions. Other environmental indicators, particularly those that do not relate directly to human well-being, have...
Authors
Jill S. Baron
Nitrogen emissions along the Colorado Front Range: Response to population growth, land and water use change, and agriculture Nitrogen emissions along the Colorado Front Range: Response to population growth, land and water use change, and agriculture
No abstract available.
Authors
Jill Baron, S. Del Grosso, D. Ojima, D.M. Theobald, W.J. Parton
Sustaining healthy freshwater ecosystems Sustaining healthy freshwater ecosystems
Functionally intact and biologically complex freshwater ecosystems provide many economically valuable commodities and services to society. The services supplied by freshwater ecosystems include flood control, transportation, recreation, purification of human and industrial wastes, habitat for plants and animals, and production of fish and other foods and marketable goods. These human...
Authors
Jill Baron, N.L. Poff
NO3 uptake in shallow, oligotrophic, mountain lakes: The influence of elevated NO3 concentrations NO3 uptake in shallow, oligotrophic, mountain lakes: The influence of elevated NO3 concentrations
Nutrient enrichment experiments were conducted in 1.2-m deep enclosures in 2 shallow, oligotrophic, mountain lakes. 15N-NO3 isotope tracer was used to compare the importance of phytoplankton and benthic compartments (epilithon, surface sediment [epipelon], and subsurface sediment) for NO3 uptake under high and low NO3 conditions. NO3 uptake approached saturation in the high-N lake, but...
Authors
K. R. Nydick, B. M. LaFrancois, Jill Baron
Nitrogen regulation of algal biomass, productivity, and composition in shallow mountain lakes, Snowy Range, Wyoming, USA Nitrogen regulation of algal biomass, productivity, and composition in shallow mountain lakes, Snowy Range, Wyoming, USA
We investigated the effects of increased nitrate (NO3), alone and in combination with phosphorus (P), on phytoplankton, epilithon, and epipelon in shallow lakes of the Snowy Range, Wyoming, using two enclosure experiments during early and late summer. Phytoplankton responded strongly to N and N + P, but not to P, with increased cell density, chlorophyll a, and photosynthesis and shifts...
Authors
Koren Nydick, Brenda Lafrancois, Jill Baron, Brett Johnson
Research in National Parks (NPS Science Forum) Research in National Parks (NPS Science Forum)
No abstract available.
Authors
Jill Baron
Filter Total Items: 23
Science and Products
Filter Total Items: 213
Hindcasting nitrogen deposition to determine an ecological critical load Hindcasting nitrogen deposition to determine an ecological critical load
Using an estimated background nitrogen (N) deposition value of 0.5 kg N·ha−1·yr−1 in 1900, and a 19-year record of measured values from Loch Vale (Colorado, USA; NADP site CO98), I reconstructed an N-deposition history using exponential equations that correlated well with EPA-reported NOx emissions from Colorado and from the sum of emissions of 11 western states. The mean wet N...
Authors
Jill Baron
Ecological thresholds: The key to successful enviromental management or an important concept with no practical application? Ecological thresholds: The key to successful enviromental management or an important concept with no practical application?
An ecological threshold is the point at which there is an abrupt change in an ecosystem quality, property or phenomenon, or where small changes in an environmental driver produce large responses in the ecosystem. Analysis of thresholds is complicated by nonlinear dynamics and by multiple factor controls that operate at diverse spatial and temporal scales. These complexities have...
Authors
P.M. Groffman, Jill Baron, T. Blett, A.J. Gold, I. Goodman, L.H. Gunderson, B.M. Levinson, Margaret A. Palmer, H.W. Paerl, G.D. Peterson, N.L. Poff, D.W. Rejeski, J.F. Reynolds, M.G. Turner, K.C. Weathers, J. Wiens
Aggregate measures of ecosystem services: Can we take the pulse of nature? Aggregate measures of ecosystem services: Can we take the pulse of nature?
National scale aggregate indicators of ecosystem services are useful for stimulating and supporting a broad public discussion about trends in the provision of these services. There are important considerations involved in producing an aggregate indicator, including whether the scientific and technological capacity exists, how to address varying perceptions of the societal importance of...
Authors
L.A. Meyerson, Jill Baron, J. Melillo, R.J. Naiman, R.I. O’Malley, G. Orians, Margaret A. Palmer, Alexander Pfaff, S. Running, O.E. Sala
High elevation ecosystem responses to atmospheric deposition of nitrogen in the Colorado Rocky Mountains, USA High elevation ecosystem responses to atmospheric deposition of nitrogen in the Colorado Rocky Mountains, USA
No abstract available.
Authors
Jill Baron, K. R. Nydick, H.M. Rueth, B. M. LaFrancois, A.P. Wolfe
Nonlinear dynamics in ecosystem response to climatic change: Case studies and policy implications Nonlinear dynamics in ecosystem response to climatic change: Case studies and policy implications
Many biological, hydrological, and geological processes are interactively linked in ecosystems. These ecological phenomena normally vary within bounded ranges, but rapid, nonlinear changes to markedly different conditions can be triggered by even small differences if threshold values are exceeded. Intrinsic and extrinsic ecological thresholds can lead to effects that cascade among...
Authors
Virginia Burkett, Douglas Wilcox, Robert Stottlemyer, Wylie Barrow, Dan Fagre, Jill Baron, Jeff Price, Jennifer Nielsen, Craig Allen, David Peterson, Greg Ruggerone, Thomas Doyle
Taking the pulse of Colorado's Front Range: Developing regional indicators of environmental and quality of life condition Taking the pulse of Colorado's Front Range: Developing regional indicators of environmental and quality of life condition
Indicators are routinely used to report the status and trends of human health, economy, educational achievement, and quality of life. Some environmental indicators, such as for water and air quality, are routinely reported and used to inform personal, management, or policy decisions. Other environmental indicators, particularly those that do not relate directly to human well-being, have...
Authors
Jill S. Baron
Nitrogen emissions along the Colorado Front Range: Response to population growth, land and water use change, and agriculture Nitrogen emissions along the Colorado Front Range: Response to population growth, land and water use change, and agriculture
No abstract available.
Authors
Jill Baron, S. Del Grosso, D. Ojima, D.M. Theobald, W.J. Parton
Sustaining healthy freshwater ecosystems Sustaining healthy freshwater ecosystems
Functionally intact and biologically complex freshwater ecosystems provide many economically valuable commodities and services to society. The services supplied by freshwater ecosystems include flood control, transportation, recreation, purification of human and industrial wastes, habitat for plants and animals, and production of fish and other foods and marketable goods. These human...
Authors
Jill Baron, N.L. Poff
NO3 uptake in shallow, oligotrophic, mountain lakes: The influence of elevated NO3 concentrations NO3 uptake in shallow, oligotrophic, mountain lakes: The influence of elevated NO3 concentrations
Nutrient enrichment experiments were conducted in 1.2-m deep enclosures in 2 shallow, oligotrophic, mountain lakes. 15N-NO3 isotope tracer was used to compare the importance of phytoplankton and benthic compartments (epilithon, surface sediment [epipelon], and subsurface sediment) for NO3 uptake under high and low NO3 conditions. NO3 uptake approached saturation in the high-N lake, but...
Authors
K. R. Nydick, B. M. LaFrancois, Jill Baron
Nitrogen regulation of algal biomass, productivity, and composition in shallow mountain lakes, Snowy Range, Wyoming, USA Nitrogen regulation of algal biomass, productivity, and composition in shallow mountain lakes, Snowy Range, Wyoming, USA
We investigated the effects of increased nitrate (NO3), alone and in combination with phosphorus (P), on phytoplankton, epilithon, and epipelon in shallow lakes of the Snowy Range, Wyoming, using two enclosure experiments during early and late summer. Phytoplankton responded strongly to N and N + P, but not to P, with increased cell density, chlorophyll a, and photosynthesis and shifts...
Authors
Koren Nydick, Brenda Lafrancois, Jill Baron, Brett Johnson
Research in National Parks (NPS Science Forum) Research in National Parks (NPS Science Forum)
No abstract available.
Authors
Jill Baron
Filter Total Items: 23
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government