Jill S Baron, PhD (Former Employee)
Science and Products
Filter Total Items: 214
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
Cumulative effects of nutrients and pH on the plankton of two mountain lakes Cumulative effects of nutrients and pH on the plankton of two mountain lakes
We conducted enclosure experiments to examine the cumulative effects of nutrient enrichment and acidification on the plankton of two mountain lakes with differing nutrient conditions. The low-nitrate lake responded to N, N plus acid, and N plus acid plus P additions, showing four- to seven-fold increases in chlorophyll a, increased photosynthetic rate, compositional shifts toward large
Authors
Brenda Moraska Lafrancois, Koren R. Nydick, Brett M. Johnson, Jill Baron
Research in National Parks (NPS Science Forum) Research in National Parks (NPS Science Forum)
No abstract available.
Authors
Jill Baron
Sustaining healthy freshwater ecosystems Sustaining healthy freshwater ecosystems
No abstract available.
Authors
Jill Baron, N.L. Poff, P. L. Angermeier, Clifford N. Dahm, P.H. Gleick, N.G. Hairston, R.B. Jackson, C.A. Johnston, B. D. Richter, A.D. Steinman
Ecological effects of nitrogen deposition in the western United States Ecological effects of nitrogen deposition in the western United States
In the western United States vast acreages of land are exposed to low levels of atmospheric nitrogen (N) deposition, with interspersed hotspots of elevated N deposition downwind of large, expanding metropolitan centers or large agricultural operations. Biological response studies in western North America demonstrate that some aquatic and terrestrial plant and microbial communities are
Authors
M.E. Fenn, Jill Baron, E.B. Allen, H.M. Rueth, K. R. Nydick, L. Geiser, W.D. Bowman, J.O. Sickman, T. Meixner, D.W. Johnson, P. Neitlich
Ecosistemas de agua dulce sustentables (Sustaining healthy freshwater ecosystems) Ecosistemas de agua dulce sustentables (Sustaining healthy freshwater ecosystems)
No abstract available.
Authors
Jill Baron, N.L. Poff, P. L. Angermeier, Clifford N. Dahm, P.H. Gleick, N.G. Hairston, R.B. Jackson, C.A. Johnston, B. D. Richter, A.D. Steinman
Environmental characteristics and benthic invertebrate assemblages in Colorado mountain lakes Environmental characteristics and benthic invertebrate assemblages in Colorado mountain lakes
Twenty-two high-elevation lakes (>3000 m) in Rocky Mountain National Park and Indian Peaks Wilderness Area, Colorado, were surveyed during summer 1998 to explore relationships among benthic invertebrates, water chemistry (particularly nitrate concentrations), and other environmental variables. Water samples were collected from the deepest portion of each lake and analyzed for ions and...
Authors
B. M. LaFrancois, D.M. Carlisle, K. R. Nydick, B. M. Johnson, Jill Baron
Human disruption of element interactions: Drivers, consequences, and trends for the twenty-first century Human disruption of element interactions: Drivers, consequences, and trends for the twenty-first century
No abstract available.
Authors
A.T. Austin, R. W. Howarth, Jill Baron, F. S. Chapin, T.R. Christensen, E.A. Holland, M.V. Ivanov, A.Y. Lein, L.A. Martinelli, J. M. Melillo, C. Shang
Isotopic study of sulfate sources and residence times in a subalpine watershed Isotopic study of sulfate sources and residence times in a subalpine watershed
Stable sulfur and oxygen isotope ratios and naturally occurring 35SSO4 activities were used to examine sulfate sources, address the role of sulfur dynamics, and estimate residence times of atmospherically derived sulfate in Loch Vale Watershed, Colorado. In 1996, surface water samples from small streams flowing through talus, forest, and wetland areas had δ34SSO4 values ranging from 1.8...
Authors
C.L. Kester, Jill Baron, J.T. Turk
Lake-specific responses to elevated atmospheric nitrogen deposition in the Colorado Rocky Mountains, U.S.A Lake-specific responses to elevated atmospheric nitrogen deposition in the Colorado Rocky Mountains, U.S.A
We explored variability among subalpine lakes sharing very similar climate and atmospheric conditions, but differing in watershed characteristics, hydrology, and food web structure. Special attention was given to nitrogen (N) dynamics because the study area receives some of the highest levels of atmospheric N deposition in the Rocky Mountains. We asked if the effect of regional N...
Authors
K. R. Nydick, B. M. LaFrancois, Jill Baron, B. M. Johnson
Responses of Englemann spruce forests to nitrogen fertilization in the Colorado Rocky Mountains Responses of Englemann spruce forests to nitrogen fertilization in the Colorado Rocky Mountains
Two old-growth coniferous forests in Colorado with differing initial soil conditions responded differently to four years of low-level fertilization with ammonium nitrate. The site (Fraser) with an average initial organic horizon soil C:N ratio of 36 and nitrogen (N) pool of 605 kg/ha showed no significant increase in net N mineralization rates. At the Fraser site, foliar and organic...
Authors
H.M. Rueth, Jill Baron, E.J. Allstott
Recent ecological and biogeochemical changes in alpine lakes of Rocky Mountain National Park (Colorado, USA): A response to anthropogenic nitrogen deposition Recent ecological and biogeochemical changes in alpine lakes of Rocky Mountain National Park (Colorado, USA): A response to anthropogenic nitrogen deposition
Dated sediment cores from five alpine lakes (>3200 m asl) in Rocky Mountain National Park (Colorado Front Range, USA) record near-synchronous stratigraphic changes that are believed to reflect ecological and biogeochemical responses to enhanced nitrogen deposition from anthropogenic sources. Changes in sediment proxies include progressive increases in the frequencies of mesotrophic...
Authors
A.P. Wolfe, A.C. Van Gorp, Jill Baron
Filter Total Items: 23
Science and Products
Filter Total Items: 214
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
Cumulative effects of nutrients and pH on the plankton of two mountain lakes Cumulative effects of nutrients and pH on the plankton of two mountain lakes
We conducted enclosure experiments to examine the cumulative effects of nutrient enrichment and acidification on the plankton of two mountain lakes with differing nutrient conditions. The low-nitrate lake responded to N, N plus acid, and N plus acid plus P additions, showing four- to seven-fold increases in chlorophyll a, increased photosynthetic rate, compositional shifts toward large
Authors
Brenda Moraska Lafrancois, Koren R. Nydick, Brett M. Johnson, Jill Baron
Research in National Parks (NPS Science Forum) Research in National Parks (NPS Science Forum)
No abstract available.
Authors
Jill Baron
Sustaining healthy freshwater ecosystems Sustaining healthy freshwater ecosystems
No abstract available.
Authors
Jill Baron, N.L. Poff, P. L. Angermeier, Clifford N. Dahm, P.H. Gleick, N.G. Hairston, R.B. Jackson, C.A. Johnston, B. D. Richter, A.D. Steinman
Ecological effects of nitrogen deposition in the western United States Ecological effects of nitrogen deposition in the western United States
In the western United States vast acreages of land are exposed to low levels of atmospheric nitrogen (N) deposition, with interspersed hotspots of elevated N deposition downwind of large, expanding metropolitan centers or large agricultural operations. Biological response studies in western North America demonstrate that some aquatic and terrestrial plant and microbial communities are
Authors
M.E. Fenn, Jill Baron, E.B. Allen, H.M. Rueth, K. R. Nydick, L. Geiser, W.D. Bowman, J.O. Sickman, T. Meixner, D.W. Johnson, P. Neitlich
Ecosistemas de agua dulce sustentables (Sustaining healthy freshwater ecosystems) Ecosistemas de agua dulce sustentables (Sustaining healthy freshwater ecosystems)
No abstract available.
Authors
Jill Baron, N.L. Poff, P. L. Angermeier, Clifford N. Dahm, P.H. Gleick, N.G. Hairston, R.B. Jackson, C.A. Johnston, B. D. Richter, A.D. Steinman
Environmental characteristics and benthic invertebrate assemblages in Colorado mountain lakes Environmental characteristics and benthic invertebrate assemblages in Colorado mountain lakes
Twenty-two high-elevation lakes (>3000 m) in Rocky Mountain National Park and Indian Peaks Wilderness Area, Colorado, were surveyed during summer 1998 to explore relationships among benthic invertebrates, water chemistry (particularly nitrate concentrations), and other environmental variables. Water samples were collected from the deepest portion of each lake and analyzed for ions and...
Authors
B. M. LaFrancois, D.M. Carlisle, K. R. Nydick, B. M. Johnson, Jill Baron
Human disruption of element interactions: Drivers, consequences, and trends for the twenty-first century Human disruption of element interactions: Drivers, consequences, and trends for the twenty-first century
No abstract available.
Authors
A.T. Austin, R. W. Howarth, Jill Baron, F. S. Chapin, T.R. Christensen, E.A. Holland, M.V. Ivanov, A.Y. Lein, L.A. Martinelli, J. M. Melillo, C. Shang
Isotopic study of sulfate sources and residence times in a subalpine watershed Isotopic study of sulfate sources and residence times in a subalpine watershed
Stable sulfur and oxygen isotope ratios and naturally occurring 35SSO4 activities were used to examine sulfate sources, address the role of sulfur dynamics, and estimate residence times of atmospherically derived sulfate in Loch Vale Watershed, Colorado. In 1996, surface water samples from small streams flowing through talus, forest, and wetland areas had δ34SSO4 values ranging from 1.8...
Authors
C.L. Kester, Jill Baron, J.T. Turk
Lake-specific responses to elevated atmospheric nitrogen deposition in the Colorado Rocky Mountains, U.S.A Lake-specific responses to elevated atmospheric nitrogen deposition in the Colorado Rocky Mountains, U.S.A
We explored variability among subalpine lakes sharing very similar climate and atmospheric conditions, but differing in watershed characteristics, hydrology, and food web structure. Special attention was given to nitrogen (N) dynamics because the study area receives some of the highest levels of atmospheric N deposition in the Rocky Mountains. We asked if the effect of regional N...
Authors
K. R. Nydick, B. M. LaFrancois, Jill Baron, B. M. Johnson
Responses of Englemann spruce forests to nitrogen fertilization in the Colorado Rocky Mountains Responses of Englemann spruce forests to nitrogen fertilization in the Colorado Rocky Mountains
Two old-growth coniferous forests in Colorado with differing initial soil conditions responded differently to four years of low-level fertilization with ammonium nitrate. The site (Fraser) with an average initial organic horizon soil C:N ratio of 36 and nitrogen (N) pool of 605 kg/ha showed no significant increase in net N mineralization rates. At the Fraser site, foliar and organic...
Authors
H.M. Rueth, Jill Baron, E.J. Allstott
Recent ecological and biogeochemical changes in alpine lakes of Rocky Mountain National Park (Colorado, USA): A response to anthropogenic nitrogen deposition Recent ecological and biogeochemical changes in alpine lakes of Rocky Mountain National Park (Colorado, USA): A response to anthropogenic nitrogen deposition
Dated sediment cores from five alpine lakes (>3200 m asl) in Rocky Mountain National Park (Colorado Front Range, USA) record near-synchronous stratigraphic changes that are believed to reflect ecological and biogeochemical responses to enhanced nitrogen deposition from anthropogenic sources. Changes in sediment proxies include progressive increases in the frequencies of mesotrophic...
Authors
A.P. Wolfe, A.C. Van Gorp, 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