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1. Migration

Author

Kauffman, Matthew, primary, Jakopak, Rhiannon, additional, Olson, Lucas, additional, Ortega, Anna, additional, Randall, Jill, additional, Rozman, Gabe, additional, Berg, Jodi, additional, Bergen, Scott, additional, Garcia, Julie K., additional, Greenspan, Evan, additional, Hurley, Mark A., additional, and Schroeder, Cody, additional

Published
2023
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3. Estimating ungulate migration corridors from sparse movement data.

Author

McKee, Jennifer L., Fattebert, Julien, Aikens, Ellen O., Berg, Jodi, Bergen, Scott, Cole, Eric K., Copeland, Holly E., Courtemanch, Alyson B., Dewey, Sarah, Hurley, Mark, Lowrey, Blake, Merkle, Jerod A., Middleton, Arthur D., Nuñez, Tristan A., Sawyer, Hall, and Kauffman, Matthew J.

Subjects
ANIMAL mechanics, ELK, LOCATION data, BROWNIAN motion, BROWNIAN bridges (Mathematics)
Abstract

Many ungulates migrate between distinct summer and winter ranges, and identifying, mapping, and conserving these migration corridors have become a focus of local, regional, and global conservation efforts. Brownian bridge movement models (BBMMs) are commonly used to empirically identify these seasonal migration corridors; however, they require location data sampled at relatively frequent intervals to obtain a robust estimate of an animal's movement path. Fitting BBMMs to sparse location data violates the assumption of conditional random movement between successive locations, overestimating the area (and width) of a migration corridor when creating individual and population‐level occurrence distributions and precluding the use of low‐frequency, or sparse, data in mapping migration corridors. In an effort to expand the utility of BBMMs to include sparse GPS data, we propose an alternative approach to model migration corridors from sparse GPS data. We demonstrate this method using GPS data collected every 2 h from four mule deer (Odocoileus hemionus) and four elk (Cervus canadensis) herds within Wyoming and Idaho. First, we used BBMMs to estimate a baseline corridor for the 2‐h data. We then subsampled the 2‐h data to one location every 12 h (a proxy for sparse data) and fitted BBMMs to the 12‐h data using a fixed motion variance (FMV) value, instead of estimating the Brownian motion variance empirically. A range of FMV values was tested to identify the value that best approximated the baseline migration corridor. FMV values within a species‐specific range (mule deer: 400–1200 m2; elk: 600–1600 m2) successfully delineated migration corridors similar to the 2‐h baseline corridors; overall, lower values delineated narrower corridors and higher values delineated wider corridors. Optimal FMV values of 800 m2 (mule deer) and 1000 m2 (elk) decreased the inflation of the 12‐h corridors relative to the 2‐h corridors from traditional BBMMs. This FMV approach thus enables using sparse movement data to approximate realistic migration corridor dimensions, providing an important alternative when movement data are collected infrequently. This approach greatly expands the number of datasets that can be used for migration corridor mapping—a useful tool for management and conservation across the globe. [ABSTRACT FROM AUTHOR]

Published
2024
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4. Ungulate migrations of the Western United States, volume 4

Author

Kauffman, Matthew, primary, Lowrey, Blake, additional, Beaupre, Chloe, additional, Bergen, Scott, additional, Bergh, Stefanie, additional, Blecha, Kevin, additional, Bundick, Samantha, additional, Burkett, Hunter, additional, Cain III, James W., additional, Carl, Peyton, additional, Casady, David, additional, Class, Corey, additional, Courtemanch, Alyson, additional, Cowardin, Michelle, additional, Diamond, Jennifer, additional, Dugger, Katie, additional, Duvuvuei, Orrin, additional, Ennis, Joanna R., additional, Flenner, Michelle, additional, Fort, Jessica, additional, Fralick, Gary, additional, Freeman, Ian, additional, Gagnon, Jeff, additional, Garcelon, David, additional, Garrison, Kyle, additional, Gelzer, Emily, additional, Greenspan, Evan, additional, Hinojoza-Rood, Valerie, additional, Hnilicka, Pat, additional, Holland, Andy, additional, Hudgens, Brian, additional, Kroger, Bart, additional, Lawson, Art, additional, McKee, Cody, additional, McKee, Jennifer L., additional, Merkle, Jerod, additional, Mong, Tony W., additional, Nelson, Haley, additional, Oates, Brendan, additional, Poulin, Marie-Pier, additional, Reddell, Craig, additional, Ritson, Robert, additional, Sawyer, Hall, additional, Schroeder, Cody, additional, Shapiro, Jessie, additional, Sprague, Scott, additional, Steiner, Erik, additional, Steingisser, Alethea, additional, Stephens, Sam, additional, Stringham, Blair, additional, Swazo-Hinds, Patrick Ryan, additional, Tatman, Nicole, additional, Wallace, Cody F., additional, Whittaker, Don, additional, Wise, Benjamin, additional, Wittmer, Heiko U., additional, and Wood, Erin, additional

Published
2024
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6. Development of the Brazilian Amazon

Author

Silveira, José Paulo, Laurance, William F., Fearnside, Philip M., Cochrane, Mark A., D'Angelo, Sammya, Bergen, Scott, and Delamônica, Patricia

Published
2001

9. Collaborative wildlife–snow science: Integrating wildlife and snow expertise to improve research and management

Author

Reinking, Adele K., primary, Højlund Pedersen, Stine, additional, Elder, Kelly, additional, Boelman, Natalie T., additional, Glass, Thomas W., additional, Oates, Brendan A., additional, Bergen, Scott, additional, Roberts, Shane, additional, Prugh, Laura R., additional, Brinkman, Todd J., additional, Coughenour, Michael B., additional, Feltner, Jennifer A., additional, Barker, Kristin J., additional, Bentzen, Torsten W., additional, Pedersen, Åshild Ø., additional, Schmidt, Niels M., additional, and Liston, Glen E., additional

Published
2022
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11. Ungulate migrations of the western United States, volume 3

Author

Kauffman, Matthew, primary, Lowrey, Blake, additional, Berg, Jodi, additional, Bergen, Scott, additional, Brimeyer, Doug, additional, Burke, Patrick, additional, Cufaude, Teal, additional, Cain III, James W., additional, Cole, Jeffrey, additional, Courtemanch, Alyson, additional, Cowardin, Michelle, additional, Cunningham, Julie, additional, DeVivo, Melia, additional, Diamond, Jennifer, additional, Duvuvuei, Orrin, additional, Fattebert, Julien, additional, Ennis, Joanna, additional, Finley, Darby, additional, Fort, Jessica, additional, Fralick, Gary, additional, Freeman, Eric, additional, Gagnon, Jeff, additional, Garcia, Julie, additional, Gelzer, Emily, additional, Graham, Morgan, additional, Gray, Jacob, additional, Greenspan, Evan, additional, Hall, L. Embere, additional, Hendricks, Curtis, additional, Holland, Andy, additional, Holmes, Brian, additional, Huggler, Katey, additional, Hurley, Mark A., additional, Jeffreys, Emily, additional, Johnson, Aran, additional, Knox, Lee, additional, Krasnow, Kevin, additional, Lockyer, Zack, additional, Manninen, Hannah, additional, McDonald, Mike, additional, McKee, Jennifer L., additional, Meacham, James, additional, Merkle, Jerod, additional, Moore, Barb, additional, Mong, Tony W., additional, Nielsen, Clayton, additional, Oates, Brendan, additional, Olsen, Kim, additional, Olson, Daniel, additional, Olson, Lucas, additional, Pieron, Matt, additional, Powell, Jake, additional, Prince, Annemarie, additional, Proffitt, Kelly, additional, Reddell, Craig, additional, Riginos, Corinna, additional, Ritson, Robert, additional, Robatcek, Sierra, additional, Roberts, Shane, additional, Sawyer, Hall, additional, Schroeder, Cody, additional, Shapiro, Jessie, additional, Simpson, Nova, additional, Sprague, Scott, additional, Steingisser, Alethea, additional, Tatman, Nicole, additional, Turnock, Benjamin, additional, Wallace, Cody, additional, and Wolf, Laura, additional

Published
2022
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12. Wave-like Patterns of Plant Phenology Determine Ungulate Movement Tactics

Author

Aikens, Ellen O., Mysterud, Atle, Merkle, Jerod A., Cagnacci, Francesca, Rivrud, Inger Maren, Hebblewhite, Mark, Hurley, Mark A., Peters, Wibke, Bergen, Scott, De Groeve, Johannes, Dwinnell, Samantha P.H., Gehr, Benedikt, Heurich, Marco, Hewison, A.J. Mark, Jarnemo, Anders, Kjellander, Petter, Kröschel, Max, Licoppe, Alain, Linnell, John D.C., Merrill, Evelyn H., Middleton, Arthur D., Morellet, Nicolas, Neufeld, Lalenia, Ortega, Anna C., Parker, Katherine L., Pedrotti, Luca, Proffitt, Kelly M., Saïd, Sonia, Sawyer, Hall, Scurlock, Brandon M., Signer, Johannes, Stent, Patrick, Šustr, Pavel, Szkorupa, Tara, Monteith, Kevin L., and Kauffman, Matthew J.

Published
2020
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13. The future of deforestation in the Brazilian Amazon

Author

Kirby, Kathryn R., Laurance, William F., Albernaz, Ana K., Schroth, Gotz, Fearnside, Philip M., Bergen, Scott, Venticinque, Eduardo M., and da Costa, Carlos

Subjects
Deforestation -- Control, Deforestation -- Forecasts and trends, Deforestation -- United States, Land use -- Planning, Land use -- Management, Land use -- United States, Rain forests -- Protection and preservation, Rain forests -- United States, Market trend/market analysis, Company business planning, Company business management, Business, international, Government, Military and naval science, Social sciences
Published
2006

15. The Future of the Brazilian Amazon

Author

Laurance, William F., Cochrane, Mark A., Bergen, Scott, Fearnside, Philip M., Delamônica, Patricia, Barber, Christopher, D'Angelo, Sammya, and Fernandes, Tito

Published
2001

16. Ungulate Migrations of the Western United States, Volume 2.

Author

Kauffman, Matthew, Lowrey, Blake, Beck, Jeffrey, Berg, Jodi, Bergen, Scott, Berger, Joel, Cain, James, Dewey, Sarah, Diamond, Jennifer, Duvuvuei, Orrin, Fattebert, Julien, Gagnon, Jeff, Garcia, Julie, Greenspan, Evan, Hall, Embere, Harper, Glenn, Harter, Stan, Hersey, Kent, Hnilicka, Pat, and Hurley, Mark

Subjects
GLOBAL Positioning System, LANDSCAPES, BIOLOGISTS, PRONGHORN
Abstract

Migration is widespread across taxonomic groups and increasingly recognized as fundamental to maintaining abundant wildlife populations and communities. Many ungulate herds migrate across the western United States to access food and avoid harsh environmental conditions. With the advent of global positioning system (GPS) collars, researchers can describe and map the year-round movements of ungulates at both large and small spatial scales. The migrations can traverse landscapes that are a mix of different jurisdictional ownership and management. Today, the landscapes migrating herds traverse are increasingly threatened by fencing, high-traffic roads, oil and gas development, and other types of permanent development. Through the use of GPS collars, a model of science-based conservation emerged in which migration corridors, stopovers, and winter ranges can be mapped in detail, thereby allowing threats and conservation opportunities to be identified and remedied. In 2018, the U.S. Geological Survey (USGS) assembled a Corridor Mapping Team (CMT) to work collaboratively with western states to map migrations of Odocoileus hemionus (mule deer), Cervus canadensis (elk), and Antilocapra americana (pronghorn). Led by the USGS Wyoming Cooperative Fish and Wildlife Research Unit, the team consists of Federal scientists, university researchers, and biologists and analysts from participating State and Tribal agencies. The first set of maps described a total of 42 migrations across 5 western states and was published in 2020 as the first volume of this report series. This second volume describes an additional 65 migrations mapped within 9 western states and select Tribal lands. As the western United States continues to grow, this report series and the associated map files released by the USGS will allow for migration maps to be used for conservation planning by a wide array of State and Federal stakeholders to reduce barriers to migration caused by fences, roads, and other development. [ABSTRACT FROM AUTHOR]

Published
2022
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23. Bad news for Arctic bears

Author

Bergen, Scott

Subjects
Arctic -- Natural history, Bears -- Food and nutrition, Zoology and wildlife conservation
Published
2009

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