Darius Semmens (Former Employee)
Science and Products
Filter Total Items: 76
Tools for measuring, modelling, and valuing ecosystem services: guidance for Key Biodiversity Areas, natural World Heritage sites, and protected areas Tools for measuring, modelling, and valuing ecosystem services: guidance for Key Biodiversity Areas, natural World Heritage sites, and protected areas
Increasing interest in measuring, modelling and valuing ecosystem services (ES), the benefits that ecosystems provide to people, has resulted in the development of an array of ES assessment tools in recent years. Selecting an appropriate tool for measuring and modelling ES can be challenging. This document provides guidance for practitioners on existing tools that can be applied to...
Authors
Rachel A Neugarten, Penny F Langhammer, Elena Osipova, Kenneth J. Bagstad, Nirmal Bhagabati, Stuart H M Butchart, Nigel Dudley, Vittoria Elliott, Leah R. Gerber, Claudia Gutierrez-Arrellano, Kasandra-Zoica Ivanic, Marianne Kettunen, Lisa Mandle, Jennifer C Merriman, Mark Mulligan, Kelvin S-H Peh, Ciara Raudsepp-Hearne, Darius J. Semmens, Sue Stolton, Simon Willcock, Craig Groves
Do economic values and expenditures for viewing waterfowl in the U.S. differ among species? Do economic values and expenditures for viewing waterfowl in the U.S. differ among species?
Many economic studies value birdwatching in general and often do not account for potential differences in viewers’ benefits from observing different species. But, how different are economic values of viewing various bird species? To answer that question, we surveyed Ducks Unlimited (DU) members using an online questionnaire to estimate trip expenditures and consumer surplus per trip for...
Authors
John Loomis, Michelle Haefele, James Dubovsky, Aaron M. Lien, Wayne E. Thogmartin, James E. Diffendorfer, Dale D. Humburg, Brady J. Mattsson, Kenneth J. Bagstad, Darius J. Semmens, Laura Lopez-Hoffman, Robert Merideth
Quantifying ecosystem service flows at multiple scales across the range of a long-distance migratory species Quantifying ecosystem service flows at multiple scales across the range of a long-distance migratory species
Migratory species provide ecosystem goods and services throughout their annual cycles, often over long distances. Designing effective conservation solutions for migratory species requires knowledge of both species ecology and the socioeconomic context of their migrations. We present a framework built around the concept that migratory species act as carriers, delivering benefit flows to...
Authors
Darius J. Semmens, James E. Diffendorfer, Kenneth J. Bagstad, Ruscena Wiederholt, Karen Oberhauser, Leslie Ries, Brice X. Semmens, Joshua Goldstein, John B. Loomis, Wayne E. Thogmartin, Brady J. Mattsson, Laura Lopez-Hoffman
A guide to calculating habitat-quality metrics to inform conservation of highly mobile species A guide to calculating habitat-quality metrics to inform conservation of highly mobile species
Many metrics exist for quantifying the relative value of habitats and pathways used by highly mobile species. Properly selecting and applying such metrics requires substantial background in mathematics and understanding the relevant management arena. To address this multidimensional challenge, we demonstrate and compare three measurements of habitat quality: graph-, occupancy-, and...
Authors
Joanna A. Bieri, Christine Sample, Wayne E. Thogmartin, James E. Diffendorfer, Julia E. Earl, Richard A. Erickson, Paula Federico, D. T. Tyler Flockhart, Sam Nicol, Darius J. Semmens, T. Skraber, Ruscena Wiederholt, Brady J. Mattsson
Recreation economics to inform migratory species conservation: Case study of the northern pintail Recreation economics to inform migratory species conservation: Case study of the northern pintail
Quantification of the economic value provided by migratory species can aid in targeting management efforts and funding to locations yielding the greatest benefits to society and species conservation. Here we illustrate a key step in this process by estimating hunting and birding values of the northern pintail (Anas acuta) within primary breeding and wintering habitats used during the...
Authors
Brady J. Mattsson, James A. Dubovsky, Wayne E. Thogmartin, Kenneth J. Bagstad, Joshua H. Goldstein, John B. Loomis, James E. Diffendorfer, Darius J. Semmens, Ruscena Wiederholt, Laura Lopez-Hoffman
Quantitative tools for implementing the new definition of significant portion of the range in the U.S. Endangered Species Act Quantitative tools for implementing the new definition of significant portion of the range in the U.S. Endangered Species Act
In 2014, the Fish and Wildlife Service (FWS) and National Marine Fisheries Service announced a new policy interpretation for the U.S. Endangered Species Act (ESA). According to the act, a species must be listed as threatened or endangered if it is determined to be threatened or endangered in a significant portion of its range (SPR). The 2014 policy seeks to provide consistency by...
Authors
Julia E. Earl, Samuel Nicol, Ruscena Wiederholt, Jay E. Diffendorfer, Darius J. Semmens, D. T. Tyler Flockhart, Brady Mattsson, Gary McCracken, D. Ryan Norris, Wayne E. Thogmartin, Laura Lopez-Hoffman
Non-USGS Publications**
Liu, Y., Mahmoud, M., Hartmann, H., Stewart, S., Wagener, T., Semmens, D., Stewart, R., Gupta, H., Dominguez, D., Hulse, D., Letcher, R., Rashleigh, B., Smith, C., Street, R., Ticehurst, J., Twery, M., van Delden, H., Waldick, R., White, D., and Winter, L., 2008, Formal scenario development for environmental impact assessment studies, in Jakeman, A., A. Voinov, A. E. Rizzoli, and S. Chen, (Eds.) Environmental Modelling, Software and Decision Support, 3. IDEA Book Series, Elsevier, 338 pp.
Kepner, W.G., Hernandez, M., Semmens, D.J., and Goodrich D.C.,2008, The Use of Scenario Analysis to Assess Future Landscape Change on Watershed Condition in the Pacific Northwest (USA), in Use of Landscape Sciences for Environmental Security: NATO Security through Science Series, Springer Publishers, The Netherlands. ISBN 978-1-4020-6588-0, pp. 237-261.
Kepner, W.G., Semmens, D.J., Hernandez, M., and Goodrich, D.C., 2008, Evaluating Hydrological Response to Forecasted Land-use Change, Chapter 15 in Special Issue of Association of American Geographers. North American Land Cover Summit. Washington, DC. pp. 275-292. ISBN 978-0-89291-271-1.
Semmens, D.J., Goodrich, D.C., Unkrich, C.L., Smith, R.E., Woolhiser, D.A., and Miller, S.N., 2008, KINEROS2 and the AGWA modeling framework, in Wheater, H., Sorooshian, S., and Sharma, K.D., eds., Hydrological Modelling In Arid and Semi-Arid Areas: Cambridge University Press, New York, 206pp.
Miller, S.N., Semmens, D.J., Goodrich, D.C., Hernandez, M., Miller, R.C., Kepner, W.G., and Guertin, D.P., 2007, The Automated Geospatial Watershed Assessment tool: Environmental Modeling and Software, v. 22, n. 3, p. 365-377.
Nikolova, M., S. Nedkov, D. Semmens, and S. Iankov, 2007, Environmental quality and landscape-risk assessment in the Yantra River Basin, in W. Kepner, W., Müller, F., Petrosillio, I., Jones, B., Krauze, K., Victorov, S., and Zurlini, G., (eds.), Use of Landscape Sciences for the Assessment of Environmental Security: NATO Security Through Science Series, Springer Publications, p. 202-217.
Kepner, W.G., Semmens, D.J., Basset, S.D., Mouat, D.A., Goodrich, D.C., 2004, Scenario analysis for the San Pedro River, analyzing hydrological consequences for a future environment: Environmental Modeling and Assessment, v. 94, p. 115-127.
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Science and Products
Filter Total Items: 76
Tools for measuring, modelling, and valuing ecosystem services: guidance for Key Biodiversity Areas, natural World Heritage sites, and protected areas Tools for measuring, modelling, and valuing ecosystem services: guidance for Key Biodiversity Areas, natural World Heritage sites, and protected areas
Increasing interest in measuring, modelling and valuing ecosystem services (ES), the benefits that ecosystems provide to people, has resulted in the development of an array of ES assessment tools in recent years. Selecting an appropriate tool for measuring and modelling ES can be challenging. This document provides guidance for practitioners on existing tools that can be applied to...
Authors
Rachel A Neugarten, Penny F Langhammer, Elena Osipova, Kenneth J. Bagstad, Nirmal Bhagabati, Stuart H M Butchart, Nigel Dudley, Vittoria Elliott, Leah R. Gerber, Claudia Gutierrez-Arrellano, Kasandra-Zoica Ivanic, Marianne Kettunen, Lisa Mandle, Jennifer C Merriman, Mark Mulligan, Kelvin S-H Peh, Ciara Raudsepp-Hearne, Darius J. Semmens, Sue Stolton, Simon Willcock, Craig Groves
Do economic values and expenditures for viewing waterfowl in the U.S. differ among species? Do economic values and expenditures for viewing waterfowl in the U.S. differ among species?
Many economic studies value birdwatching in general and often do not account for potential differences in viewers’ benefits from observing different species. But, how different are economic values of viewing various bird species? To answer that question, we surveyed Ducks Unlimited (DU) members using an online questionnaire to estimate trip expenditures and consumer surplus per trip for...
Authors
John Loomis, Michelle Haefele, James Dubovsky, Aaron M. Lien, Wayne E. Thogmartin, James E. Diffendorfer, Dale D. Humburg, Brady J. Mattsson, Kenneth J. Bagstad, Darius J. Semmens, Laura Lopez-Hoffman, Robert Merideth
Quantifying ecosystem service flows at multiple scales across the range of a long-distance migratory species Quantifying ecosystem service flows at multiple scales across the range of a long-distance migratory species
Migratory species provide ecosystem goods and services throughout their annual cycles, often over long distances. Designing effective conservation solutions for migratory species requires knowledge of both species ecology and the socioeconomic context of their migrations. We present a framework built around the concept that migratory species act as carriers, delivering benefit flows to...
Authors
Darius J. Semmens, James E. Diffendorfer, Kenneth J. Bagstad, Ruscena Wiederholt, Karen Oberhauser, Leslie Ries, Brice X. Semmens, Joshua Goldstein, John B. Loomis, Wayne E. Thogmartin, Brady J. Mattsson, Laura Lopez-Hoffman
A guide to calculating habitat-quality metrics to inform conservation of highly mobile species A guide to calculating habitat-quality metrics to inform conservation of highly mobile species
Many metrics exist for quantifying the relative value of habitats and pathways used by highly mobile species. Properly selecting and applying such metrics requires substantial background in mathematics and understanding the relevant management arena. To address this multidimensional challenge, we demonstrate and compare three measurements of habitat quality: graph-, occupancy-, and...
Authors
Joanna A. Bieri, Christine Sample, Wayne E. Thogmartin, James E. Diffendorfer, Julia E. Earl, Richard A. Erickson, Paula Federico, D. T. Tyler Flockhart, Sam Nicol, Darius J. Semmens, T. Skraber, Ruscena Wiederholt, Brady J. Mattsson
Recreation economics to inform migratory species conservation: Case study of the northern pintail Recreation economics to inform migratory species conservation: Case study of the northern pintail
Quantification of the economic value provided by migratory species can aid in targeting management efforts and funding to locations yielding the greatest benefits to society and species conservation. Here we illustrate a key step in this process by estimating hunting and birding values of the northern pintail (Anas acuta) within primary breeding and wintering habitats used during the...
Authors
Brady J. Mattsson, James A. Dubovsky, Wayne E. Thogmartin, Kenneth J. Bagstad, Joshua H. Goldstein, John B. Loomis, James E. Diffendorfer, Darius J. Semmens, Ruscena Wiederholt, Laura Lopez-Hoffman
Quantitative tools for implementing the new definition of significant portion of the range in the U.S. Endangered Species Act Quantitative tools for implementing the new definition of significant portion of the range in the U.S. Endangered Species Act
In 2014, the Fish and Wildlife Service (FWS) and National Marine Fisheries Service announced a new policy interpretation for the U.S. Endangered Species Act (ESA). According to the act, a species must be listed as threatened or endangered if it is determined to be threatened or endangered in a significant portion of its range (SPR). The 2014 policy seeks to provide consistency by...
Authors
Julia E. Earl, Samuel Nicol, Ruscena Wiederholt, Jay E. Diffendorfer, Darius J. Semmens, D. T. Tyler Flockhart, Brady Mattsson, Gary McCracken, D. Ryan Norris, Wayne E. Thogmartin, Laura Lopez-Hoffman
Non-USGS Publications**
Liu, Y., Mahmoud, M., Hartmann, H., Stewart, S., Wagener, T., Semmens, D., Stewart, R., Gupta, H., Dominguez, D., Hulse, D., Letcher, R., Rashleigh, B., Smith, C., Street, R., Ticehurst, J., Twery, M., van Delden, H., Waldick, R., White, D., and Winter, L., 2008, Formal scenario development for environmental impact assessment studies, in Jakeman, A., A. Voinov, A. E. Rizzoli, and S. Chen, (Eds.) Environmental Modelling, Software and Decision Support, 3. IDEA Book Series, Elsevier, 338 pp.
Kepner, W.G., Hernandez, M., Semmens, D.J., and Goodrich D.C.,2008, The Use of Scenario Analysis to Assess Future Landscape Change on Watershed Condition in the Pacific Northwest (USA), in Use of Landscape Sciences for Environmental Security: NATO Security through Science Series, Springer Publishers, The Netherlands. ISBN 978-1-4020-6588-0, pp. 237-261.
Kepner, W.G., Semmens, D.J., Hernandez, M., and Goodrich, D.C., 2008, Evaluating Hydrological Response to Forecasted Land-use Change, Chapter 15 in Special Issue of Association of American Geographers. North American Land Cover Summit. Washington, DC. pp. 275-292. ISBN 978-0-89291-271-1.
Semmens, D.J., Goodrich, D.C., Unkrich, C.L., Smith, R.E., Woolhiser, D.A., and Miller, S.N., 2008, KINEROS2 and the AGWA modeling framework, in Wheater, H., Sorooshian, S., and Sharma, K.D., eds., Hydrological Modelling In Arid and Semi-Arid Areas: Cambridge University Press, New York, 206pp.
Miller, S.N., Semmens, D.J., Goodrich, D.C., Hernandez, M., Miller, R.C., Kepner, W.G., and Guertin, D.P., 2007, The Automated Geospatial Watershed Assessment tool: Environmental Modeling and Software, v. 22, n. 3, p. 365-377.
Nikolova, M., S. Nedkov, D. Semmens, and S. Iankov, 2007, Environmental quality and landscape-risk assessment in the Yantra River Basin, in W. Kepner, W., Müller, F., Petrosillio, I., Jones, B., Krauze, K., Victorov, S., and Zurlini, G., (eds.), Use of Landscape Sciences for the Assessment of Environmental Security: NATO Security Through Science Series, Springer Publications, p. 202-217.
Kepner, W.G., Semmens, D.J., Basset, S.D., Mouat, D.A., Goodrich, D.C., 2004, Scenario analysis for the San Pedro River, analyzing hydrological consequences for a future environment: Environmental Modeling and Assessment, v. 94, p. 115-127.
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.