Gregory B Lawrence (Former Employee)
Science and Products
Filter Total Items: 109
Widespread diminishing anthropogenic effects on calcium in freshwaters Widespread diminishing anthropogenic effects on calcium in freshwaters
Calcium (Ca) is an essential element for almost all living organisms. Here, we examined global variation and controls of freshwater Ca concentrations, using 440 599 water samples from 43 184 inland water sites in 57 countries. We found that the global median Ca concentration was 4.0 mg L−1 with 20.7% of the water samples showing Ca concentrations ≤ 1.5 mg L−1, a threshold considered...
Authors
Gesa A. Weyhenmeyer, Jens Hartmann, Dag O. Hessen, Jiří Kopáček, Josef Hejzlar, Stephan Jacquet, Stephen K. Hamilton, Piet Verburg, Taylor H. Leach, Martin Schmid, Giovanna Flaim, Tiina Nõges, Peeter Nõges, Valerie C. Wentzky, Michela Rogora, James A. Rusak, Sarian Kosten, Andrew M. Paterson, Katrin Teubner, Scott N. Higgins, Gregory B. Lawrence, Külli Kangur, Ilga Kokorite, Leonardo Cerasino, Clara Funk, Rebecca G. Harvey, Florentina Moatar, Heleen de Wit, Thomas Zechmeister
Response of water chemistry and young-of-year brook trout to channel and watershed liming in streams showing lagging recovery from acidic deposition Response of water chemistry and young-of-year brook trout to channel and watershed liming in streams showing lagging recovery from acidic deposition
Reductions in sulfur emissions have initiated chemical recovery of surface waters impacted by acidic deposition in the Adirondack region of New York State. However, acidified streams remain common in the region, which limits recovery of brook trout (Salvelinus fontinalis) populations. To investigate liming as a method to accelerate recovery of brook trout, the channels of two acidified...
Authors
Daniel C Josephson, Gregory B. Lawrence, Scott D. George, Jason Siemion, Barry P. Baldigo, Clifford E. Kraft
Spatial and temporal variability of fish assemblages in acidified streams: Implications for long-term monitoring Spatial and temporal variability of fish assemblages in acidified streams: Implications for long-term monitoring
Numerous studies have established strong linkages between acid deposition, soil and surface-water acidification, and toxicity to aquatic biota. Little is known however, about the effects of acidification on fish assemblages in headwater streams because they are highly variable, and pre-acidification data are often lacking. The primary purpose of this study was to describe spatial and...
Authors
Scott D. George, Barry P. Baldigo, Gregory B. Lawrence
Plant richness and composition in hardwood forest understories vary along an acidic deposition and soil-chemical gradient in the northeastern United States Plant richness and composition in hardwood forest understories vary along an acidic deposition and soil-chemical gradient in the northeastern United States
Aims A century of atmospheric deposition of sulfur and nitrogen has acidified soils and undermined the health and recruitment of foundational tree species in the northeastern US. However, effects of acidic deposition on the forest understory plant communities of this region are poorly documented. We investigated how forest understory plant species composition and richness varied across...
Authors
Michael R. Zarfos, Martin Dovciak, Gregory B. Lawrence, Todd C. McDonnell, Timothy J. Sullivan
Unprocessed atmospheric nitrate in waters of the Northern Forest Region in the USA and Canada Unprocessed atmospheric nitrate in waters of the Northern Forest Region in the USA and Canada
Little is known about the regional extent and variability of nitrate from atmospheric deposition that is transported to streams without biological processing in forests. We measured water chemistry and isotopic tracers (δ18O and δ15N) of nitrate sources across the Northern Forest Region of the U.S. and Canada and reanalyzed data from other studies to determine when, where, and how...
Authors
Stepen D Sebestyen, Donald D Ross, James B. Shanley, Emily M. Elliott, Carol Kendall, John L. Campbell, D Bryan Dail, Ivan J Fernandez, Christine L Goodale, Gregory B. Lawrence, Gary M. Lovett, Patrick J McHale, Myron J Mitchell, Sarah J. Nelson, Michelle D Shattuck, Trent R Wickman, Rebecca T. Barnes, Joel T. Bostic, Anthony R Buda, Douglas A Burns, Keith N. Eshleman, Jacques C. Finlay, David M. Nelson, Nobuhito Ohte, Linda H Pardo, Lucy A Rose, Robert J Sabo, Sherry L. Schiff, John Spoelstra, Karl W Williard
Probabilistic relationships between acid-base chemistry and fish assemblages in streams of the western Adirondack Mountains, New York, USA Probabilistic relationships between acid-base chemistry and fish assemblages in streams of the western Adirondack Mountains, New York, USA
Surface waters across much of the Adirondacks of New York were acidified in the late 20th century but began to recover after the 1990 amendments to the Clean Air Act. Little data, however, were available to characterize biological impacts and predict recovery of fish assemblages in regional streams. Quantitative fish and chemistry surveys were completed in 47 headwater streams during...
Authors
Barry Baldigo, Scott George, Timothy J. Sullivan, Charles T. Driscoll, Douglas A. Burns, Shuai Shoa, Gregory B. Lawrence
Science and Products
Filter Total Items: 109
Widespread diminishing anthropogenic effects on calcium in freshwaters Widespread diminishing anthropogenic effects on calcium in freshwaters
Calcium (Ca) is an essential element for almost all living organisms. Here, we examined global variation and controls of freshwater Ca concentrations, using 440 599 water samples from 43 184 inland water sites in 57 countries. We found that the global median Ca concentration was 4.0 mg L−1 with 20.7% of the water samples showing Ca concentrations ≤ 1.5 mg L−1, a threshold considered...
Authors
Gesa A. Weyhenmeyer, Jens Hartmann, Dag O. Hessen, Jiří Kopáček, Josef Hejzlar, Stephan Jacquet, Stephen K. Hamilton, Piet Verburg, Taylor H. Leach, Martin Schmid, Giovanna Flaim, Tiina Nõges, Peeter Nõges, Valerie C. Wentzky, Michela Rogora, James A. Rusak, Sarian Kosten, Andrew M. Paterson, Katrin Teubner, Scott N. Higgins, Gregory B. Lawrence, Külli Kangur, Ilga Kokorite, Leonardo Cerasino, Clara Funk, Rebecca G. Harvey, Florentina Moatar, Heleen de Wit, Thomas Zechmeister
Response of water chemistry and young-of-year brook trout to channel and watershed liming in streams showing lagging recovery from acidic deposition Response of water chemistry and young-of-year brook trout to channel and watershed liming in streams showing lagging recovery from acidic deposition
Reductions in sulfur emissions have initiated chemical recovery of surface waters impacted by acidic deposition in the Adirondack region of New York State. However, acidified streams remain common in the region, which limits recovery of brook trout (Salvelinus fontinalis) populations. To investigate liming as a method to accelerate recovery of brook trout, the channels of two acidified...
Authors
Daniel C Josephson, Gregory B. Lawrence, Scott D. George, Jason Siemion, Barry P. Baldigo, Clifford E. Kraft
Spatial and temporal variability of fish assemblages in acidified streams: Implications for long-term monitoring Spatial and temporal variability of fish assemblages in acidified streams: Implications for long-term monitoring
Numerous studies have established strong linkages between acid deposition, soil and surface-water acidification, and toxicity to aquatic biota. Little is known however, about the effects of acidification on fish assemblages in headwater streams because they are highly variable, and pre-acidification data are often lacking. The primary purpose of this study was to describe spatial and...
Authors
Scott D. George, Barry P. Baldigo, Gregory B. Lawrence
Plant richness and composition in hardwood forest understories vary along an acidic deposition and soil-chemical gradient in the northeastern United States Plant richness and composition in hardwood forest understories vary along an acidic deposition and soil-chemical gradient in the northeastern United States
Aims A century of atmospheric deposition of sulfur and nitrogen has acidified soils and undermined the health and recruitment of foundational tree species in the northeastern US. However, effects of acidic deposition on the forest understory plant communities of this region are poorly documented. We investigated how forest understory plant species composition and richness varied across...
Authors
Michael R. Zarfos, Martin Dovciak, Gregory B. Lawrence, Todd C. McDonnell, Timothy J. Sullivan
Unprocessed atmospheric nitrate in waters of the Northern Forest Region in the USA and Canada Unprocessed atmospheric nitrate in waters of the Northern Forest Region in the USA and Canada
Little is known about the regional extent and variability of nitrate from atmospheric deposition that is transported to streams without biological processing in forests. We measured water chemistry and isotopic tracers (δ18O and δ15N) of nitrate sources across the Northern Forest Region of the U.S. and Canada and reanalyzed data from other studies to determine when, where, and how...
Authors
Stepen D Sebestyen, Donald D Ross, James B. Shanley, Emily M. Elliott, Carol Kendall, John L. Campbell, D Bryan Dail, Ivan J Fernandez, Christine L Goodale, Gregory B. Lawrence, Gary M. Lovett, Patrick J McHale, Myron J Mitchell, Sarah J. Nelson, Michelle D Shattuck, Trent R Wickman, Rebecca T. Barnes, Joel T. Bostic, Anthony R Buda, Douglas A Burns, Keith N. Eshleman, Jacques C. Finlay, David M. Nelson, Nobuhito Ohte, Linda H Pardo, Lucy A Rose, Robert J Sabo, Sherry L. Schiff, John Spoelstra, Karl W Williard
Probabilistic relationships between acid-base chemistry and fish assemblages in streams of the western Adirondack Mountains, New York, USA Probabilistic relationships between acid-base chemistry and fish assemblages in streams of the western Adirondack Mountains, New York, USA
Surface waters across much of the Adirondacks of New York were acidified in the late 20th century but began to recover after the 1990 amendments to the Clean Air Act. Little data, however, were available to characterize biological impacts and predict recovery of fish assemblages in regional streams. Quantitative fish and chemistry surveys were completed in 47 headwater streams during...
Authors
Barry Baldigo, Scott George, Timothy J. Sullivan, Charles T. Driscoll, Douglas A. Burns, Shuai Shoa, Gregory B. Lawrence