Sarah Shafer
Sarah Shafer is a Research Geologist for the Geosciences and Environmental Change Science Center
Science and Products
Filter Total Items: 37
Projected climate impacts for the amphibians of the western hemisphere
Given their physiological requirements, limited dispersal abilities, and hydrologically sensitive habitats, amphibians are likely to be highly sensitive to future climatic changes. We used three approaches to map areas in the western hemisphere where amphibians are particularly likely to be affected by climate change. First, we used bioclimatic models to project potential climate-driven shifts in
Authors
Joshua J. Lawler, Sarah L. Shafer, Betsy A. Bancroft, Andrew R. Blaustein
U.S. Geological Survey Science Strategy for the Wyoming Landscape Conservation Initiative
Southwest Wyoming's wildlife and habitat resources are increasingly affected by energy and urban/exurban development, climate change, and other key drivers of ecosystem change. To ensure that southwest Wyoming's wildlife populations and habitats persist in the face of development and other changes, a consortium of public resource-management agencies proposed the Wyoming Landscape Conservation Init
Authors
Zachary H. Bowen, Cameron L. Aldridge, Patrick J. Anderson, Geneva W. Chong, Mark A. Drummond, Collin G. Homer, Ronald C. Johnson, Matthew J. Kauffman, Steven T. Knick, John J. Kosovich, Kirk A. Miller, Tom Owens, Sarah L. Shafer, Michael J. Sweat
Projected climate-induced faunal change in the Western Hemisphere
Climate change is predicted to be one of the greatest drivers of ecological change in the coming century. Increases in temperature over the last century have clearly been linked to shifts in species distributions. Given the magnitude of projected future climatic changes, we can expect even larger range shifts in the coming century. These changes will, in turn, alter ecological communities and the
Authors
J.J. Lawler, S.L. Shafer, D. White, P. Kareiva, E.P. Maurer, A.R. Blaustein, P. J. Bartlein
Effects of experimental protocol on global vegetation model accuracy: a comparison of simulated and observed vegetation patterns for Asia
Prognostic vegetation models have been widely used to study the interactions between environmental change and biological systems. This study examines the sensitivity of vegetation model simulations to: (i) the selection of input climatologies representing different time periods and their associated atmospheric CO2 concentrations, (ii) the choice of observed vegetation data for evaluating the model
Authors
Guoping Tang, Sarah L. Shafer, Patrick J. Barlein, Justin O. Holman
Temporal and spatial structure in a daily wildfire-start data set from the western United States (198696)
The temporal and spatial structure of 332 404 daily fire-start records from the western United States for the period 1986 through 1996 is illustrated using several complimentary visualisation techniques. We supplement maps and time series plots with Hovmo??ller diagrams that reduce the spatial dimensionality of the daily data in order to reveal the underlying space?time structure. The mapped distr
Authors
P. J. Bartlein, S. W. Hostetler, S.L. Shafer, J.O. Holman, A.M. Solomon
Atlas of relations between climatic parameters and distributions of important trees and shrubs in North America: Ecoregions of North America
Climate is the primary factor controlling the continental-scale distribution of plant species, although the relations between climatic parameters and species' ranges are only now beginning to be quantified. This volume examines the relations between climate and the distributions of (1) Kuchler's 'potential natural vegetation' categories for the 48 contiguous States of the United States of America,
Authors
Robert S. Thompson, Katherine H. Anderson, Richard T. Pelltier, Sarah L. Shafer, Patrick J. Bartlein
Atlas of relations between climatic parameters and distributions of important trees and shrubs in North America - Alaska species and ecoregions
Climate is the primary factor in controlling the continental-scale distribution of plant species, although the relations between climatic parameters and species' ranges is only now beginning to be quantified. Preceding volumes of this atlas explored the continental-scale relations between climatic parameters and the distributions of woody plant species across all of the continent of North America.
Authors
Robert S. Thompson, Katherine H. Anderson, Laura E. Strickland, Sarah L. Shafer, Richard T. Pelltier, Patrick J. Bartlein
Understanding the spatial heterogeneity of global environmental change in mountain regions
One of the challenges for global environmental change research is to understand how future climate changes will be expressed in mountain regions. The physiographic complexity of mountains creates environments that can be highly variable over relatively short distances. This spatial heterogeneity reflects a hierarchy of environmental controls. At regional scales, insolation and atmospheric circulat
Authors
Sarah Shafer, Patrick J. Bartlein, Cathy Whitlock
Topographic, bioclimatic, and vegetation characteristics of three ecoregion classification systems in North America: Comparisons along continent-wide transects
Ecoregion classification systems are increasingly used for policy and management decisions, particularly among conservation and natural resource managers. A number of ecoregion classification systems are currently available, with each system defining ecoregions using different classification methods and different types of data. As a result, each classification system describes a unique set of ecor
Authors
R.S. Thompson, S.L. Shafer, K. H. Anderson, L.E. Strickland, R.T. Pelltier, P. J. Bartlein, M.W. Kerwin
Vital signs monitoring plan for the Klamath Network: Phase I report
This report chronicles the Phase 1 stage of the vital signs monitoring program for the Klamath Network. It consists of two chapters and eleven appendixes. The purposes of Chapter One are to 1) describe the network administrative structure and approach to planning; 2) introduce the Klamath Network parks, their resources, and environmental settings; 3) explain the need for monitoring changes in reso
Authors
Daniel Sarr, Dennis Odion, Robert E. Truitt, Erik A. Beever, Sarah Shafer, Andrew Duff, Sean B. Smith, Windy Bunn, Judy Rocchio, Eli Sarnat, John Alexander, Steve Jessup
Quaternary vegetation and climate change in the western United States: Developments, perspectives, and prospects
This chapter explores the strengths and shortcomings of the major sources of data on Quaternary vegetation and climate change and discusses the use of models as a means to explore past and potential future environmental changes. The flora and major vegetation types of the western United States are present for several million years. Ongoing changes in atmospheric chemistry, climate, and human activ
Authors
Robert S. Thompson, Sarah Shafer, Laura E. Strickland, Peter K. Van De Water, Katherine H. Anderson
The role of climate and vegetation change in shaping past and future fire regimes in the northwestern US and the implications for ecosystem management
Fire is an important part of the disturbance regimes of northwestern US forests and its role in maintaining and altering forest vegetation is evident in the paleoecological record of the region. Long-term reconstructions of Holocene fire regimes, provided by the analysis of charcoal, pollen, and other fire proxies in a network of lake records, indicate that the Pacific Northwest and summer-dry reg
Authors
C. Whitlock, S.L. Shafer, J. Marlon
Science and Products
Filter Total Items: 37
Projected climate impacts for the amphibians of the western hemisphere
Given their physiological requirements, limited dispersal abilities, and hydrologically sensitive habitats, amphibians are likely to be highly sensitive to future climatic changes. We used three approaches to map areas in the western hemisphere where amphibians are particularly likely to be affected by climate change. First, we used bioclimatic models to project potential climate-driven shifts in
Authors
Joshua J. Lawler, Sarah L. Shafer, Betsy A. Bancroft, Andrew R. Blaustein
U.S. Geological Survey Science Strategy for the Wyoming Landscape Conservation Initiative
Southwest Wyoming's wildlife and habitat resources are increasingly affected by energy and urban/exurban development, climate change, and other key drivers of ecosystem change. To ensure that southwest Wyoming's wildlife populations and habitats persist in the face of development and other changes, a consortium of public resource-management agencies proposed the Wyoming Landscape Conservation Init
Authors
Zachary H. Bowen, Cameron L. Aldridge, Patrick J. Anderson, Geneva W. Chong, Mark A. Drummond, Collin G. Homer, Ronald C. Johnson, Matthew J. Kauffman, Steven T. Knick, John J. Kosovich, Kirk A. Miller, Tom Owens, Sarah L. Shafer, Michael J. Sweat
Projected climate-induced faunal change in the Western Hemisphere
Climate change is predicted to be one of the greatest drivers of ecological change in the coming century. Increases in temperature over the last century have clearly been linked to shifts in species distributions. Given the magnitude of projected future climatic changes, we can expect even larger range shifts in the coming century. These changes will, in turn, alter ecological communities and the
Authors
J.J. Lawler, S.L. Shafer, D. White, P. Kareiva, E.P. Maurer, A.R. Blaustein, P. J. Bartlein
Effects of experimental protocol on global vegetation model accuracy: a comparison of simulated and observed vegetation patterns for Asia
Prognostic vegetation models have been widely used to study the interactions between environmental change and biological systems. This study examines the sensitivity of vegetation model simulations to: (i) the selection of input climatologies representing different time periods and their associated atmospheric CO2 concentrations, (ii) the choice of observed vegetation data for evaluating the model
Authors
Guoping Tang, Sarah L. Shafer, Patrick J. Barlein, Justin O. Holman
Temporal and spatial structure in a daily wildfire-start data set from the western United States (198696)
The temporal and spatial structure of 332 404 daily fire-start records from the western United States for the period 1986 through 1996 is illustrated using several complimentary visualisation techniques. We supplement maps and time series plots with Hovmo??ller diagrams that reduce the spatial dimensionality of the daily data in order to reveal the underlying space?time structure. The mapped distr
Authors
P. J. Bartlein, S. W. Hostetler, S.L. Shafer, J.O. Holman, A.M. Solomon
Atlas of relations between climatic parameters and distributions of important trees and shrubs in North America: Ecoregions of North America
Climate is the primary factor controlling the continental-scale distribution of plant species, although the relations between climatic parameters and species' ranges are only now beginning to be quantified. This volume examines the relations between climate and the distributions of (1) Kuchler's 'potential natural vegetation' categories for the 48 contiguous States of the United States of America,
Authors
Robert S. Thompson, Katherine H. Anderson, Richard T. Pelltier, Sarah L. Shafer, Patrick J. Bartlein
Atlas of relations between climatic parameters and distributions of important trees and shrubs in North America - Alaska species and ecoregions
Climate is the primary factor in controlling the continental-scale distribution of plant species, although the relations between climatic parameters and species' ranges is only now beginning to be quantified. Preceding volumes of this atlas explored the continental-scale relations between climatic parameters and the distributions of woody plant species across all of the continent of North America.
Authors
Robert S. Thompson, Katherine H. Anderson, Laura E. Strickland, Sarah L. Shafer, Richard T. Pelltier, Patrick J. Bartlein
Understanding the spatial heterogeneity of global environmental change in mountain regions
One of the challenges for global environmental change research is to understand how future climate changes will be expressed in mountain regions. The physiographic complexity of mountains creates environments that can be highly variable over relatively short distances. This spatial heterogeneity reflects a hierarchy of environmental controls. At regional scales, insolation and atmospheric circulat
Authors
Sarah Shafer, Patrick J. Bartlein, Cathy Whitlock
Topographic, bioclimatic, and vegetation characteristics of three ecoregion classification systems in North America: Comparisons along continent-wide transects
Ecoregion classification systems are increasingly used for policy and management decisions, particularly among conservation and natural resource managers. A number of ecoregion classification systems are currently available, with each system defining ecoregions using different classification methods and different types of data. As a result, each classification system describes a unique set of ecor
Authors
R.S. Thompson, S.L. Shafer, K. H. Anderson, L.E. Strickland, R.T. Pelltier, P. J. Bartlein, M.W. Kerwin
Vital signs monitoring plan for the Klamath Network: Phase I report
This report chronicles the Phase 1 stage of the vital signs monitoring program for the Klamath Network. It consists of two chapters and eleven appendixes. The purposes of Chapter One are to 1) describe the network administrative structure and approach to planning; 2) introduce the Klamath Network parks, their resources, and environmental settings; 3) explain the need for monitoring changes in reso
Authors
Daniel Sarr, Dennis Odion, Robert E. Truitt, Erik A. Beever, Sarah Shafer, Andrew Duff, Sean B. Smith, Windy Bunn, Judy Rocchio, Eli Sarnat, John Alexander, Steve Jessup
Quaternary vegetation and climate change in the western United States: Developments, perspectives, and prospects
This chapter explores the strengths and shortcomings of the major sources of data on Quaternary vegetation and climate change and discusses the use of models as a means to explore past and potential future environmental changes. The flora and major vegetation types of the western United States are present for several million years. Ongoing changes in atmospheric chemistry, climate, and human activ
Authors
Robert S. Thompson, Sarah Shafer, Laura E. Strickland, Peter K. Van De Water, Katherine H. Anderson
The role of climate and vegetation change in shaping past and future fire regimes in the northwestern US and the implications for ecosystem management
Fire is an important part of the disturbance regimes of northwestern US forests and its role in maintaining and altering forest vegetation is evident in the paleoecological record of the region. Long-term reconstructions of Holocene fire regimes, provided by the analysis of charcoal, pollen, and other fire proxies in a network of lake records, indicate that the Pacific Northwest and summer-dry reg
Authors
C. Whitlock, S.L. Shafer, J. Marlon