Matthew M Smith (Former Employee)
Science and Products
Filter Total Items: 19
Toward more realistic projections of soil carbon dynamics by Earth system models Toward more realistic projections of soil carbon dynamics by Earth system models
Soil carbon (C) is a critical component of Earth system models (ESMs), and its diverse representations are a major source of the large spread across models in the terrestrial C sink from the third to fifth assessment reports of the Intergovernmental Panel on Climate Change (IPCC). Improving soil C projections is of a high priority for Earth system modeling in the future IPCC and other...
Authors
Y. Luo, Anders Ahlstrom, Steven D. Allison, Niels H. Batjes, V. Brovkin, Nuno Carvalhais, Adrian Chappell, Philippe Ciais, Eric A. Davidson, Adien Finzi, Katerina Georgiou, Bertrand Guenet, Oleksandra Hararuk, Jennifer Harden, Yujie He, Francesca Hopkins, L. Jiang, Charles Koven, Robert B. Jackson, Chris D. Jones, M. Lara, J. Liang, A. David McGuire, William Parton, Changhui Peng, J. Randerson, Alejandro Salazar, Carlos A. Sierra, Matthew J. Smith, Hanqin Tian, Katherine E. O Todd-Brown, Margaret S. Torn, Kees Jan van Groenigen, Ying Wang, Tristram O. West, Yaxing Wei, William R. Wieder, Jianyang Xia, Xia Xu, Xiaofeng Xu, T. Zhou
Prevalence and genetic diversity of haematozoa in South American waterfowl and evidence for intercontinental redistribution of parasites by migratory birds Prevalence and genetic diversity of haematozoa in South American waterfowl and evidence for intercontinental redistribution of parasites by migratory birds
To understand the role of migratory birds in the movement and transmission of haematozoa within and between continental regions, we examined 804 blood samples collected from eleven endemic species of South American waterfowl in Peru and Argentina for infection by Haemoproteus, Plasmodium, and/or Leucocytozono blood parasites. Infections were detected in 25 individuals of six species for...
Authors
Matthew M. Smith, Andrew M. Ramey
A real-time, quantitative PCR protocol for assessing the relative parasitemia of Leucocytozoon in waterfowl A real-time, quantitative PCR protocol for assessing the relative parasitemia of Leucocytozoon in waterfowl
Microscopic examination of blood smears can be effective at diagnosing and quantifying hematozoa infections. However, this method requires highly trained observers, is time consuming, and may be inaccurate for detection of infections at low levels of parasitemia. To develop a molecular methodology for identifying and quantifying Leucocytozoon parasite infection in wild waterfowl...
Authors
Matthew M. Smith, Joel A. Schmutz, Chloe Apelgren, Andrew M. Ramey
Genetic diversity and host specificity varies across three genera of blood parasites in ducks of the Pacific Americas Flyway Genetic diversity and host specificity varies across three genera of blood parasites in ducks of the Pacific Americas Flyway
Birds of the order Anseriformes, commonly referred to as waterfowl, are frequently infected by Haemosporidia of the genera Haemoproteus, Plasmodium, and Leucocytozoon via dipteran vectors. We analyzed nucleotide sequences of the Cytochrome b (Cytb) gene from parasites of these genera detected in six species of ducks from Alaska and California, USA to characterize the genetic diversity of
Authors
Andrew B. Reeves, Matthew M. Smith, Brandt W. Meixell, Joseph P. Fleskes, Andrew M. Ramey
What do we gain from simplicity versus complexity in species distribution models? What do we gain from simplicity versus complexity in species distribution models?
Species distribution models (SDMs) are widely used to explain and predict species ranges and environmental niches. They are most commonly constructed by inferring species' occurrence–environment relationships using statistical and machine-learning methods. The variety of methods that can be used to construct SDMs (e.g. generalized linear/additive models, tree-based models, maximum...
Authors
Cory Merow, Matthew J. Smith, Thomas C. Edwards, Antoine Guisan, Sean M. McMahon, Signe Normand, Wilfried Thuiller, Rafael O. Wuest, Niklaus E. Zimmermann, Jane Elith
Rapid cooling rates at an active mid-ocean ridge from zircon thermochronology Rapid cooling rates at an active mid-ocean ridge from zircon thermochronology
Oceanic spreading ridges are Earth's most productive crust generating environment, but mechanisms and rates of crustal accretion and heat loss are debated. Existing observations on cooling rates are ambiguous regarding the prevalence of conductive vs. convective cooling of lower oceanic crust. Here, we report the discovery and dating of zircon in mid-ocean ridge dacite lavas that...
Authors
Axel K. Schmitt, Michael R. Perfit, Kenneth H. Rubin, Daniel F. Stockli, Matthew C. Smith, Laurie A. Cotsonika, Georg F. Zellmer, W. Ian Ridley
Preliminary report on the USGS-NASA Langley Corehole -- the Chesapeake Bay Impact Crater Project: A. Operational summary for the USGS -- NASA Langley Corehole, Hampton, Virginia. B. Preliminary geologic summary for the USGS -- NASA Langley Corehol, Hampto Preliminary report on the USGS-NASA Langley Corehole -- the Chesapeake Bay Impact Crater Project: A. Operational summary for the USGS -- NASA Langley Corehole, Hampton, Virginia. B. Preliminary geologic summary for the USGS -- NASA Langley Corehol, Hampto
No abstract available.
Authors
Gregory S. Gohn, Arthur C. Clark, Donald G. Queen, Joel S. Levine, Randolph E. McFarland, David S. Powars, Bruce T. Scott, Laurel M. Bybell, Thomas M. Cronin, Lucy E. Edwards, Norman O. Frederiksen, J. Wright Horton, Glen A. Izett, Gerald H. Johnson, C. Wylie Poag, James E. Quick, J. Stephen Schindler, Jean M. Self-Trail, Matthew J. Smith, Robert G. Stamm, Robert E. Weems
Science and Products
Filter Total Items: 19
Toward more realistic projections of soil carbon dynamics by Earth system models Toward more realistic projections of soil carbon dynamics by Earth system models
Soil carbon (C) is a critical component of Earth system models (ESMs), and its diverse representations are a major source of the large spread across models in the terrestrial C sink from the third to fifth assessment reports of the Intergovernmental Panel on Climate Change (IPCC). Improving soil C projections is of a high priority for Earth system modeling in the future IPCC and other...
Authors
Y. Luo, Anders Ahlstrom, Steven D. Allison, Niels H. Batjes, V. Brovkin, Nuno Carvalhais, Adrian Chappell, Philippe Ciais, Eric A. Davidson, Adien Finzi, Katerina Georgiou, Bertrand Guenet, Oleksandra Hararuk, Jennifer Harden, Yujie He, Francesca Hopkins, L. Jiang, Charles Koven, Robert B. Jackson, Chris D. Jones, M. Lara, J. Liang, A. David McGuire, William Parton, Changhui Peng, J. Randerson, Alejandro Salazar, Carlos A. Sierra, Matthew J. Smith, Hanqin Tian, Katherine E. O Todd-Brown, Margaret S. Torn, Kees Jan van Groenigen, Ying Wang, Tristram O. West, Yaxing Wei, William R. Wieder, Jianyang Xia, Xia Xu, Xiaofeng Xu, T. Zhou
Prevalence and genetic diversity of haematozoa in South American waterfowl and evidence for intercontinental redistribution of parasites by migratory birds Prevalence and genetic diversity of haematozoa in South American waterfowl and evidence for intercontinental redistribution of parasites by migratory birds
To understand the role of migratory birds in the movement and transmission of haematozoa within and between continental regions, we examined 804 blood samples collected from eleven endemic species of South American waterfowl in Peru and Argentina for infection by Haemoproteus, Plasmodium, and/or Leucocytozono blood parasites. Infections were detected in 25 individuals of six species for...
Authors
Matthew M. Smith, Andrew M. Ramey
A real-time, quantitative PCR protocol for assessing the relative parasitemia of Leucocytozoon in waterfowl A real-time, quantitative PCR protocol for assessing the relative parasitemia of Leucocytozoon in waterfowl
Microscopic examination of blood smears can be effective at diagnosing and quantifying hematozoa infections. However, this method requires highly trained observers, is time consuming, and may be inaccurate for detection of infections at low levels of parasitemia. To develop a molecular methodology for identifying and quantifying Leucocytozoon parasite infection in wild waterfowl...
Authors
Matthew M. Smith, Joel A. Schmutz, Chloe Apelgren, Andrew M. Ramey
Genetic diversity and host specificity varies across three genera of blood parasites in ducks of the Pacific Americas Flyway Genetic diversity and host specificity varies across three genera of blood parasites in ducks of the Pacific Americas Flyway
Birds of the order Anseriformes, commonly referred to as waterfowl, are frequently infected by Haemosporidia of the genera Haemoproteus, Plasmodium, and Leucocytozoon via dipteran vectors. We analyzed nucleotide sequences of the Cytochrome b (Cytb) gene from parasites of these genera detected in six species of ducks from Alaska and California, USA to characterize the genetic diversity of
Authors
Andrew B. Reeves, Matthew M. Smith, Brandt W. Meixell, Joseph P. Fleskes, Andrew M. Ramey
What do we gain from simplicity versus complexity in species distribution models? What do we gain from simplicity versus complexity in species distribution models?
Species distribution models (SDMs) are widely used to explain and predict species ranges and environmental niches. They are most commonly constructed by inferring species' occurrence–environment relationships using statistical and machine-learning methods. The variety of methods that can be used to construct SDMs (e.g. generalized linear/additive models, tree-based models, maximum...
Authors
Cory Merow, Matthew J. Smith, Thomas C. Edwards, Antoine Guisan, Sean M. McMahon, Signe Normand, Wilfried Thuiller, Rafael O. Wuest, Niklaus E. Zimmermann, Jane Elith
Rapid cooling rates at an active mid-ocean ridge from zircon thermochronology Rapid cooling rates at an active mid-ocean ridge from zircon thermochronology
Oceanic spreading ridges are Earth's most productive crust generating environment, but mechanisms and rates of crustal accretion and heat loss are debated. Existing observations on cooling rates are ambiguous regarding the prevalence of conductive vs. convective cooling of lower oceanic crust. Here, we report the discovery and dating of zircon in mid-ocean ridge dacite lavas that...
Authors
Axel K. Schmitt, Michael R. Perfit, Kenneth H. Rubin, Daniel F. Stockli, Matthew C. Smith, Laurie A. Cotsonika, Georg F. Zellmer, W. Ian Ridley
Preliminary report on the USGS-NASA Langley Corehole -- the Chesapeake Bay Impact Crater Project: A. Operational summary for the USGS -- NASA Langley Corehole, Hampton, Virginia. B. Preliminary geologic summary for the USGS -- NASA Langley Corehol, Hampto Preliminary report on the USGS-NASA Langley Corehole -- the Chesapeake Bay Impact Crater Project: A. Operational summary for the USGS -- NASA Langley Corehole, Hampton, Virginia. B. Preliminary geologic summary for the USGS -- NASA Langley Corehol, Hampto
No abstract available.
Authors
Gregory S. Gohn, Arthur C. Clark, Donald G. Queen, Joel S. Levine, Randolph E. McFarland, David S. Powars, Bruce T. Scott, Laurel M. Bybell, Thomas M. Cronin, Lucy E. Edwards, Norman O. Frederiksen, J. Wright Horton, Glen A. Izett, Gerald H. Johnson, C. Wylie Poag, James E. Quick, J. Stephen Schindler, Jean M. Self-Trail, Matthew J. Smith, Robert G. Stamm, Robert E. Weems
*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