Duane Diefenbach, PhD (Former Employee)
Science and Products
Unique Study of Isolated Bobcat Population Confirms Accuracy of Extinction Model
The reintroduction of 32 bobcats to an island off the coast of Georgia more than three decades ago created an ideal experiment to examine the accuracy of a genetic-modeling technique that predicts extinction of isolated wildlife populations. That’s the conclusion of Penn State researchers who continue to monitor the bobcat population on Cumberland Island National Seashore, and who conducted a...
Wild Turkey Summer Sighting Survey Observations Wild Turkey Summer Sighting Survey Observations
R code to analyze these data to estimate proportion of hens with poults and poults per brood, and estimate temporal trends in proportion of hens with poults is available at https://doi.org/10.5066/P14VYTVN. The state wildlife agencies in Maryland, New Jersey, New York, Ohio, Pennsylvania, Virginia, and West Virginia collected observations of wild turkeys during June-August, 2000-2023...
Data for Distance sampling accounting for density gradient and animal distribution Data for Distance sampling accounting for density gradient and animal distribution
There are 9 datasets. one distance sampling dataset, 4 resource selection datasets, and 4 outputs from bootstrapped resource selection models the use the estimated correction factor. The 4 resource selection datasets have data that can be used in a binomial generalized linear mixed effect model to create the correction factor. The distance sampling data set is used to estimate density...
Filter Total Items: 80
A framework for analyzing wild turkey summer sighting data. A framework for analyzing wild turkey summer sighting data.
Wildlife agencies collect data on productivity (e.g., proportion of hens with poults and number of poults per hen) of wild turkey (Meleagris gallopavo) to monitor population status and trends. However, sampling protocols to collect productivity data rely on opportunistic observations reported by wildlife agency personnel and the public and have changed over time and differed among...
Authors
Duane Diefenbach, Frances Buderman, Mary Casalena, Michael Dye, Robert Gates, Laura Christine Gigliotti, C. Robert Long, Katherine Martin, Michael Muthersbaugh, Michael Peters, James Sloan, Joshua Stiller, Mark Wiley
Atypical winter coat coloration of snowshoe hares near the southern extent of their range Atypical winter coat coloration of snowshoe hares near the southern extent of their range
Many species have a variety of adaptations to winter weather, but these adaptations could become maladaptive if winter snowfall and temperatures are more variable. Snowshoe hares (Lepus americanus) molt from a brown summer coat to a white winter coat, but reductions in snow cover could result in phenotypic mismatch, which in turn could reduce survival. Hare populations near the southern...
Authors
Laura Christine Gigliotti, Emily Boyd, Duane Diefenbach
When the wild things are: Defining mammalian diel activity and plasticity When the wild things are: Defining mammalian diel activity and plasticity
Circadian rhythms are a mechanism by which species adapt to environmental variability and fundamental to understanding species behavior. However, we lack data and a standardized framework to accurately assess and compare temporal activity for species during rapid ecological change. Through a global network representing 38 countries, we leveraged 8.9 million mammalian observations to...
Authors
Kadambari Devarajan, Mason Fidino, Zach Farris, Solny A. Adalsteinsson, Gabriel Andrade-Ponce, Julia Angstmann, Whitney Anthonysamy, Jesica Aquino, Addisu Asefa, Belen Avila, Larissa L. Bailey, Lyandra Maria de Sousa Barbosa, Marcela de Frias Barreto, Owain Barton, Chloe E Bates, Mayara Guimarães Beltrão, Tori Bird, Elizabeth G Biro, Francesco Bisi, Daniel Bohórquez, Mark Boyce, Justin S. Brashares, Grace Bullington, Phoebe Burns, Jessica Burr, Andrew Butler, Kendall Calhoun, Tien Trung Cao, Natalia Casado, Juan Camilo Cepeda-Duque, Jonathon D. Cepek, Adriano Garcia Chiarello, Merri Collins, Pedro Cordeiro-Estrela, Sebastian Costa, Giacomo Cremonesi, Bogdan Cristescu, Paula Cruz, Anna Carolina Figueiredo de Albuquerque, Carlos De Angelo, Cláudia Bueno De Campos, Liana Mara Mendes De Sena, Mario Di Bitetti, Douglas de Matos Dias, Duane Diefenbach, Tim Doherty, Thais P dos Santos, Gabriela Teixeira Duarte, Timothy M. Eppley, John Erb, Carolina Franco Esteves, Bryn Evans, Maria L.M. Falcão, Hugo Fernandes-Ferreira, John R. Fieberg, Luiz Carlos Firmino de Souza Filho, Jason Fisher, Marie-Josee Fortin, George A. Gale, Travis Gallo, Laken Ganoe, Rony Garcia-Anleu, Kaitlyn M. Gaynor, Tiziana A. Gelmi-Candusso, Phillys N. Gichuru, Quimey Gomez, Austin Green, Luiza Neves Guimarães, Jeffrey Haight, Lavendar R. Harris, Zachary D. Hawn, Jordan Heiman, Huy Quoc Hoang, Sarah Huebner, Fabiola Iannarilli, María Eugenia Iezzi, Jacob S. Ivan, Kodi Jaspers, Mark J Jordan, Jason Kamilar, Mamadou Kane, Mohammad Hosein Karimi, Marcella J. Kelly, Michel Kohl, William P. Kuvlesky, Andrew Ladle, Rachel N. Larson, Quy Tan Le, Duy Le, Van Son Le, Elizabeth W. Lehrer, Patrick E Lendrum, Jesse Lewis, Andrés Link, Diego J. Lizcano, Jason Lombardi, Robert Long, Eva López-Tello, Camile Lugarini, David Lugo, Paula MacKay, Maria Madadi, Rodolfo Assis Magalhães, Seth Magle, Ludmila Hufnagel Regis Diniz Maia, Salvador Mandujano, Taisiia Marchenkova, Paulo Henrique Marinho, Laurie Marker, Julia Martinez Pardo, Adriano Martinoli, Rodrigo Lima Massara, Juliana Masseloux, Dina Matiukhina, Amy Mayer, Luis Mazariegos, Maureen R. McClung, Alex McInturff, Darby McPhail, Amy Mertl, Christopher Middaugh, David Miller, David Mills, Dale Miquelle, Vivianna Miritis, Remington J. Moll, Peter Molnar, Robert Montgomery, Toni Morelli, Alessio Mortelliti, Rachael I. Mueller, Anna S. Mukhacheva, Kayleigh Mullen, Asia Murphy, Vance Nepomuceno, Dusit Ngoprasert, An Nguyen, Thanh Van Nguyen, Van Thai Nguyen, Hoa Anh Nguyen Quang, Rob Nipko, Ana Clarissa Costa Nobre, Joseph Northrup, Megan Owen, Adriano Pereira Paglia, Meredith S. Palmer, Gabriela Palomo-Munoz, Lain E. Pardo, Chrystina Parks, Ana Maria de Oliveira Paschoal, Brent Patterson, Agustin Paviolo, Liba Pejchar, Mary Pendergast, Humberto L. Perotto-Baldivieso, Timofei Petrov, Mairi K.P. Poisson, Daiana Jeronimo Polli, Morteza Pourmirzai, Alexander Reebin, Katie R. Remine, Lindsey Rich, Christopher S. Richardson, Facundo Robino, Daniel G Rocha, Fabiana Lopes Rocha, Flávio Henrique Guimarães Rodrigues, Adam T. Rohnke, Travis J. Ryan, Carmen M. Salsbury, Heather A. Sander, Nadia Maria da Cruz Santos-Cavalcante, Cagan H. Sekercioglu, Ivan Seryodkin, Dede Hendra Setiawan, Shabnam Shadloo, Mahsa Shahhosseini, Graeme Shannon, Catherine J. Shier, G. Bradley Smith, Tom Snyder, Rahel Sollmann, Kimberly L. Sparks, Kriangsak Sribuarod, Colleen St. Claire, Theodore Stankowich, Robert Steinmetz, Cassondra J Stevenson, Sunarto Sunarto, Thilina D. Surasinghe, Svetlana V. Sutyrina, Ronald Swaisgood, Atie Taktehrani, Kanchan Thapa, Matthew Thorton, Andrew Tilker, Mathias W. Tobler, Van Bang Tran, Jody Tucker, Russell Van Horn, Juan S. Vargas-Soto, Karen L. Velásquez, Jan Venter, Eduardo M. Venticinque, Stijn Verschueren, Erin Wampole, Darcy J. Watchorn, Oliver Wearn, Katherine Weiss, Alejandro Welschen, Febri Anggriawan Widodo, Jacque Williamson, Andreas Wilting, George Wittemyer, Arturo Zavaleta, Amanda J. Zellmer, Brian Daniel Gerber
Accounting for non-random samples with distance sampling to estimate population density Accounting for non-random samples with distance sampling to estimate population density
A critical assumption of standard distance sampling is that sampling lines are located such that animals are uniformly distributed as a function of distance from the line. Failure to meet this assumption can introduce bias in the estimator.Many studies have used landscape features, such as roads or rivers, as lines, which can violate assumptions of distance sampling in two ways. First...
Authors
Duane Diefenbach, Jacob Trowbridge, Amanda Van Buskirk, Tess McConnell, Kevin Lamp, Tiago Marques, David Walters, Bret D. Wallingford, Christopher S. Rosenberry
Neonatal antipredator tactics shape female movement patterns in large herbivores Neonatal antipredator tactics shape female movement patterns in large herbivores
Caring for newborn offspring hampers resource acquisition of mammalian females, curbing their ability to meet the high energy expenditure of early lactation. Newborns are particularly vulnerable, and large herbivores have evolved a continuum of neonatal anti-predator tactics, ranging from immobile hider to highly mobile follower offspring. How these tactics constrain female movements...
Authors
Kamal Atmeh, Christophe Bonenfant, Jean-Michel Gaillard, Mathieu Garel, A.J. Mark Hewison, Pascal Marchand, Nicolas Morellet, Pia Anderwald, Bayarbaatar Buuveibaatar, Jeffrey Beck, Matthew S. Becker, Floris M. van Beest, Jodi Berg, Ulrika A. Bergvall, Randall B. Boone, Mark Boyce, Simon Chamaill'e-Jammes, Yannick Chaval, Chimeddorj Buyanaa, David Christianson, Simone Ciuti, Steeve D. Côté, Duane Diefenbach, Egil Droge, Johan Du Toit, Samantha P. Dwinnell, Julian Fennessy, Flurin Filli, Daniel Fortin, Emma E. Hart, Matthew Hayes, Mark Hebblewhite, Morten Heim, Ivar Herfindal, Marco Heurich, Christian von Hoermann, Katey Huggler, Craig Jackson, Andrew F. Jakes, Paul F. Jones, Petra Kaczensky, Matthew Kauffman, Petter Kjellander, Tayler LaSharr, Leif Egil Loe, Roel May, Philip McLoughlin, Erling L. Meisingset, Evelyn Merrill, Kevin L. Monteith, Thomas Mueller, Atle Mysterud, Dejid Nandintsetseg, Kirk Olson, John Payne, Scott Pearson, Ashild Ønvik Pedersen, Dustin Ranglack, Adele K. Reinking, Thomas Rempfler, Clifford G Rice, Eivin Røskaft, Bernt-Erik Sæther, Sonia Saïd, Hugo Santacreu, Niels Schmidt, Daan Smit, Jared Stabach, Martin-Hugues St-Laurent, Joëlle Taillon, W. David Walter, Kevin White, Guillaume Péron, Anne Loison
Complex interactions of deer herbivory, soil chemistry, and competing vegetation explain oak–hickory forest tree regeneration in central Pennsylvania, USA Complex interactions of deer herbivory, soil chemistry, and competing vegetation explain oak–hickory forest tree regeneration in central Pennsylvania, USA
The root causes of forest tree regeneration failure are difficult to resolve, although numerous studies show ungulate herbivory, soil conditions, and competition from undesirable vegetation as likely contributors. To better understand the relative importance of each issue, we conducted a 7-year manipulative experiment to assess the interactive effects of white-tailed deer (Odocoileus...
Authors
Danielle Begley-Miller, Duane Diefenbach, Emily Domoto, Patrick Drohan, Phillip Jones, Marc E. McDill, Christopher S. Rosenberry, Autumn Sabo, Bret D. Wallingford
Multistage time-to-event models improve survival inference by partitioning mortality processes of tracked organisms Multistage time-to-event models improve survival inference by partitioning mortality processes of tracked organisms
Advances in tagging technologies are expanding opportunities to estimate survival of fish and wildlife populations. Yet, capture and handling effects could impact survival outcomes and bias inference about natural mortality processes. We developed a multistage time-to-event model that can partition the survival process into sequential phases that reflect the tagged animal experience...
Authors
Suresh Sethi, Alex Koeberle, Anna Poulton, Daniel W. Linden, Duane Diefenbach, Frances Buderman, Mary Casalena, Kenneth Duren
Delayed positive responses of snowshoe hares to prescribed burning in a fire-adapted ecosystem Delayed positive responses of snowshoe hares to prescribed burning in a fire-adapted ecosystem
Wildlife populations near the periphery of a species’ range are vulnerable to changes in habitat conditions and climate. However, habitat management and maintenance can help with the persistence of these susceptible populations. Snowshoe hare (Lepus americanus) populations near the southern extent of their range are at risk of extirpation because of changing winter conditions, coupled...
Authors
Laura C. Gigliotti, Emily Boyd, Duane Diefenbach
Change-point models for identifying behavioral transitions in wild animals Change-point models for identifying behavioral transitions in wild animals
Animal behavior can be difficult, time-consuming, and costly to observe in the field directly. Innovative modeling methods, such as hidden Markov models (HMMs), allow researchers to infer unobserved animal behaviors from movement data, and implementations often assume that transitions between states occur multiple times. However, some behavioral shifts of interest, such as parturition...
Authors
K.P. Gundermann, Duane Diefenbach, W. David Walter, A Corondi, J.E. Banfield, B.D. Wallingford, D.P. Stainbrook, C.S. Rosenberry, F.E. Buderman
Soil and geomorphic patterns within relict charcoal hearths could represent unique ecosystem niches Soil and geomorphic patterns within relict charcoal hearths could represent unique ecosystem niches
Hearths used for 19th and 20th century charcoal manufacturing have been found to have unique plant communities or to produce unique growth characteristics for some species but not others. Given known differences in hearth morphology, within hearth physical and chemical differences may exist and result in unique ecologic niches. We examined soil stratigraphy across 8 relict charcoal...
Authors
S. Bayuzick, D. Guarin, J. Benavides, A. Bonhage, F. Hirsch, Duane Diefenbach, M. McDill, T. Raab, P.J. Drohan
Species and physiographic factors drive Indian cucumber root and Canada mayflower plant chemistry: Implications for white-tailed deer forage quality Species and physiographic factors drive Indian cucumber root and Canada mayflower plant chemistry: Implications for white-tailed deer forage quality
Nutrition is fundamental to white-tailed deer (Odocoileus virginianus) management given its relationship to habitat carrying capacity and population productivity. Ecological Sites (ESs) are a United States federal landscape management unit of specific land potential due to unique soils, topography, climate, parent material, and perhaps deer forage nutritional value. We present results of...
Authors
Nico Navarro, Duane Diefenbach, Marc E. McDill, Emily Domoto, Christopher Rosenberry, Patrick Drohan
Small anthropogenic landforms from past charcoal production control moisture dynamics and chemistry in northcentral Appalachian soils Small anthropogenic landforms from past charcoal production control moisture dynamics and chemistry in northcentral Appalachian soils
Throughout the northeastern United States (U.S.) and Europe, relict charcoal hearths (RCHs) are regularly being discovered in proximity to furnaces once used for the extraction of metal from ore or quick-lime production; charcoal produced in hearths was used as a furnace fuel. Given previous research has shown that topographic and subsurface disturbance can be great when a hearth is...
Authors
S. Bayuzick, D. Guarin, A. Bonhage, F. Hirsch, Duane Diefenbach, M. McDill, T. Raab, P.J. Drohan
Generalized Linear Mixed Models for Analyzing Wild Turkey Summer Sighting Data Generalized Linear Mixed Models for Analyzing Wild Turkey Summer Sighting Data
Observation of wild turkey (Meleagris gallopavo) are collected by many state wildlife agencies to monitor reproduction. This code demonstrates how to use generalized linear models to account for when and where data are collected, as well as how to combine data from multiple states to estimate parameters when data may be missing in some years. In addition, the code shows how to test for a...
Code for Distance sampling accounting for density gradient and animal distribution Code for Distance sampling accounting for density gradient and animal distribution
Code to estimate animal density from line transect surveys where auxiliary data are available to model the distribution of animals near the survey line and the distribution of animals across the study area.
Science and Products
Unique Study of Isolated Bobcat Population Confirms Accuracy of Extinction Model
The reintroduction of 32 bobcats to an island off the coast of Georgia more than three decades ago created an ideal experiment to examine the accuracy of a genetic-modeling technique that predicts extinction of isolated wildlife populations. That’s the conclusion of Penn State researchers who continue to monitor the bobcat population on Cumberland Island National Seashore, and who conducted a...
Wild Turkey Summer Sighting Survey Observations Wild Turkey Summer Sighting Survey Observations
R code to analyze these data to estimate proportion of hens with poults and poults per brood, and estimate temporal trends in proportion of hens with poults is available at https://doi.org/10.5066/P14VYTVN. The state wildlife agencies in Maryland, New Jersey, New York, Ohio, Pennsylvania, Virginia, and West Virginia collected observations of wild turkeys during June-August, 2000-2023...
Data for Distance sampling accounting for density gradient and animal distribution Data for Distance sampling accounting for density gradient and animal distribution
There are 9 datasets. one distance sampling dataset, 4 resource selection datasets, and 4 outputs from bootstrapped resource selection models the use the estimated correction factor. The 4 resource selection datasets have data that can be used in a binomial generalized linear mixed effect model to create the correction factor. The distance sampling data set is used to estimate density...
Filter Total Items: 80
A framework for analyzing wild turkey summer sighting data. A framework for analyzing wild turkey summer sighting data.
Wildlife agencies collect data on productivity (e.g., proportion of hens with poults and number of poults per hen) of wild turkey (Meleagris gallopavo) to monitor population status and trends. However, sampling protocols to collect productivity data rely on opportunistic observations reported by wildlife agency personnel and the public and have changed over time and differed among...
Authors
Duane Diefenbach, Frances Buderman, Mary Casalena, Michael Dye, Robert Gates, Laura Christine Gigliotti, C. Robert Long, Katherine Martin, Michael Muthersbaugh, Michael Peters, James Sloan, Joshua Stiller, Mark Wiley
Atypical winter coat coloration of snowshoe hares near the southern extent of their range Atypical winter coat coloration of snowshoe hares near the southern extent of their range
Many species have a variety of adaptations to winter weather, but these adaptations could become maladaptive if winter snowfall and temperatures are more variable. Snowshoe hares (Lepus americanus) molt from a brown summer coat to a white winter coat, but reductions in snow cover could result in phenotypic mismatch, which in turn could reduce survival. Hare populations near the southern...
Authors
Laura Christine Gigliotti, Emily Boyd, Duane Diefenbach
When the wild things are: Defining mammalian diel activity and plasticity When the wild things are: Defining mammalian diel activity and plasticity
Circadian rhythms are a mechanism by which species adapt to environmental variability and fundamental to understanding species behavior. However, we lack data and a standardized framework to accurately assess and compare temporal activity for species during rapid ecological change. Through a global network representing 38 countries, we leveraged 8.9 million mammalian observations to...
Authors
Kadambari Devarajan, Mason Fidino, Zach Farris, Solny A. Adalsteinsson, Gabriel Andrade-Ponce, Julia Angstmann, Whitney Anthonysamy, Jesica Aquino, Addisu Asefa, Belen Avila, Larissa L. Bailey, Lyandra Maria de Sousa Barbosa, Marcela de Frias Barreto, Owain Barton, Chloe E Bates, Mayara Guimarães Beltrão, Tori Bird, Elizabeth G Biro, Francesco Bisi, Daniel Bohórquez, Mark Boyce, Justin S. Brashares, Grace Bullington, Phoebe Burns, Jessica Burr, Andrew Butler, Kendall Calhoun, Tien Trung Cao, Natalia Casado, Juan Camilo Cepeda-Duque, Jonathon D. Cepek, Adriano Garcia Chiarello, Merri Collins, Pedro Cordeiro-Estrela, Sebastian Costa, Giacomo Cremonesi, Bogdan Cristescu, Paula Cruz, Anna Carolina Figueiredo de Albuquerque, Carlos De Angelo, Cláudia Bueno De Campos, Liana Mara Mendes De Sena, Mario Di Bitetti, Douglas de Matos Dias, Duane Diefenbach, Tim Doherty, Thais P dos Santos, Gabriela Teixeira Duarte, Timothy M. Eppley, John Erb, Carolina Franco Esteves, Bryn Evans, Maria L.M. Falcão, Hugo Fernandes-Ferreira, John R. Fieberg, Luiz Carlos Firmino de Souza Filho, Jason Fisher, Marie-Josee Fortin, George A. Gale, Travis Gallo, Laken Ganoe, Rony Garcia-Anleu, Kaitlyn M. Gaynor, Tiziana A. Gelmi-Candusso, Phillys N. Gichuru, Quimey Gomez, Austin Green, Luiza Neves Guimarães, Jeffrey Haight, Lavendar R. Harris, Zachary D. Hawn, Jordan Heiman, Huy Quoc Hoang, Sarah Huebner, Fabiola Iannarilli, María Eugenia Iezzi, Jacob S. Ivan, Kodi Jaspers, Mark J Jordan, Jason Kamilar, Mamadou Kane, Mohammad Hosein Karimi, Marcella J. Kelly, Michel Kohl, William P. Kuvlesky, Andrew Ladle, Rachel N. Larson, Quy Tan Le, Duy Le, Van Son Le, Elizabeth W. Lehrer, Patrick E Lendrum, Jesse Lewis, Andrés Link, Diego J. Lizcano, Jason Lombardi, Robert Long, Eva López-Tello, Camile Lugarini, David Lugo, Paula MacKay, Maria Madadi, Rodolfo Assis Magalhães, Seth Magle, Ludmila Hufnagel Regis Diniz Maia, Salvador Mandujano, Taisiia Marchenkova, Paulo Henrique Marinho, Laurie Marker, Julia Martinez Pardo, Adriano Martinoli, Rodrigo Lima Massara, Juliana Masseloux, Dina Matiukhina, Amy Mayer, Luis Mazariegos, Maureen R. McClung, Alex McInturff, Darby McPhail, Amy Mertl, Christopher Middaugh, David Miller, David Mills, Dale Miquelle, Vivianna Miritis, Remington J. Moll, Peter Molnar, Robert Montgomery, Toni Morelli, Alessio Mortelliti, Rachael I. Mueller, Anna S. Mukhacheva, Kayleigh Mullen, Asia Murphy, Vance Nepomuceno, Dusit Ngoprasert, An Nguyen, Thanh Van Nguyen, Van Thai Nguyen, Hoa Anh Nguyen Quang, Rob Nipko, Ana Clarissa Costa Nobre, Joseph Northrup, Megan Owen, Adriano Pereira Paglia, Meredith S. Palmer, Gabriela Palomo-Munoz, Lain E. Pardo, Chrystina Parks, Ana Maria de Oliveira Paschoal, Brent Patterson, Agustin Paviolo, Liba Pejchar, Mary Pendergast, Humberto L. Perotto-Baldivieso, Timofei Petrov, Mairi K.P. Poisson, Daiana Jeronimo Polli, Morteza Pourmirzai, Alexander Reebin, Katie R. Remine, Lindsey Rich, Christopher S. Richardson, Facundo Robino, Daniel G Rocha, Fabiana Lopes Rocha, Flávio Henrique Guimarães Rodrigues, Adam T. Rohnke, Travis J. Ryan, Carmen M. Salsbury, Heather A. Sander, Nadia Maria da Cruz Santos-Cavalcante, Cagan H. Sekercioglu, Ivan Seryodkin, Dede Hendra Setiawan, Shabnam Shadloo, Mahsa Shahhosseini, Graeme Shannon, Catherine J. Shier, G. Bradley Smith, Tom Snyder, Rahel Sollmann, Kimberly L. Sparks, Kriangsak Sribuarod, Colleen St. Claire, Theodore Stankowich, Robert Steinmetz, Cassondra J Stevenson, Sunarto Sunarto, Thilina D. Surasinghe, Svetlana V. Sutyrina, Ronald Swaisgood, Atie Taktehrani, Kanchan Thapa, Matthew Thorton, Andrew Tilker, Mathias W. Tobler, Van Bang Tran, Jody Tucker, Russell Van Horn, Juan S. Vargas-Soto, Karen L. Velásquez, Jan Venter, Eduardo M. Venticinque, Stijn Verschueren, Erin Wampole, Darcy J. Watchorn, Oliver Wearn, Katherine Weiss, Alejandro Welschen, Febri Anggriawan Widodo, Jacque Williamson, Andreas Wilting, George Wittemyer, Arturo Zavaleta, Amanda J. Zellmer, Brian Daniel Gerber
Accounting for non-random samples with distance sampling to estimate population density Accounting for non-random samples with distance sampling to estimate population density
A critical assumption of standard distance sampling is that sampling lines are located such that animals are uniformly distributed as a function of distance from the line. Failure to meet this assumption can introduce bias in the estimator.Many studies have used landscape features, such as roads or rivers, as lines, which can violate assumptions of distance sampling in two ways. First...
Authors
Duane Diefenbach, Jacob Trowbridge, Amanda Van Buskirk, Tess McConnell, Kevin Lamp, Tiago Marques, David Walters, Bret D. Wallingford, Christopher S. Rosenberry
Neonatal antipredator tactics shape female movement patterns in large herbivores Neonatal antipredator tactics shape female movement patterns in large herbivores
Caring for newborn offspring hampers resource acquisition of mammalian females, curbing their ability to meet the high energy expenditure of early lactation. Newborns are particularly vulnerable, and large herbivores have evolved a continuum of neonatal anti-predator tactics, ranging from immobile hider to highly mobile follower offspring. How these tactics constrain female movements...
Authors
Kamal Atmeh, Christophe Bonenfant, Jean-Michel Gaillard, Mathieu Garel, A.J. Mark Hewison, Pascal Marchand, Nicolas Morellet, Pia Anderwald, Bayarbaatar Buuveibaatar, Jeffrey Beck, Matthew S. Becker, Floris M. van Beest, Jodi Berg, Ulrika A. Bergvall, Randall B. Boone, Mark Boyce, Simon Chamaill'e-Jammes, Yannick Chaval, Chimeddorj Buyanaa, David Christianson, Simone Ciuti, Steeve D. Côté, Duane Diefenbach, Egil Droge, Johan Du Toit, Samantha P. Dwinnell, Julian Fennessy, Flurin Filli, Daniel Fortin, Emma E. Hart, Matthew Hayes, Mark Hebblewhite, Morten Heim, Ivar Herfindal, Marco Heurich, Christian von Hoermann, Katey Huggler, Craig Jackson, Andrew F. Jakes, Paul F. Jones, Petra Kaczensky, Matthew Kauffman, Petter Kjellander, Tayler LaSharr, Leif Egil Loe, Roel May, Philip McLoughlin, Erling L. Meisingset, Evelyn Merrill, Kevin L. Monteith, Thomas Mueller, Atle Mysterud, Dejid Nandintsetseg, Kirk Olson, John Payne, Scott Pearson, Ashild Ønvik Pedersen, Dustin Ranglack, Adele K. Reinking, Thomas Rempfler, Clifford G Rice, Eivin Røskaft, Bernt-Erik Sæther, Sonia Saïd, Hugo Santacreu, Niels Schmidt, Daan Smit, Jared Stabach, Martin-Hugues St-Laurent, Joëlle Taillon, W. David Walter, Kevin White, Guillaume Péron, Anne Loison
Complex interactions of deer herbivory, soil chemistry, and competing vegetation explain oak–hickory forest tree regeneration in central Pennsylvania, USA Complex interactions of deer herbivory, soil chemistry, and competing vegetation explain oak–hickory forest tree regeneration in central Pennsylvania, USA
The root causes of forest tree regeneration failure are difficult to resolve, although numerous studies show ungulate herbivory, soil conditions, and competition from undesirable vegetation as likely contributors. To better understand the relative importance of each issue, we conducted a 7-year manipulative experiment to assess the interactive effects of white-tailed deer (Odocoileus...
Authors
Danielle Begley-Miller, Duane Diefenbach, Emily Domoto, Patrick Drohan, Phillip Jones, Marc E. McDill, Christopher S. Rosenberry, Autumn Sabo, Bret D. Wallingford
Multistage time-to-event models improve survival inference by partitioning mortality processes of tracked organisms Multistage time-to-event models improve survival inference by partitioning mortality processes of tracked organisms
Advances in tagging technologies are expanding opportunities to estimate survival of fish and wildlife populations. Yet, capture and handling effects could impact survival outcomes and bias inference about natural mortality processes. We developed a multistage time-to-event model that can partition the survival process into sequential phases that reflect the tagged animal experience...
Authors
Suresh Sethi, Alex Koeberle, Anna Poulton, Daniel W. Linden, Duane Diefenbach, Frances Buderman, Mary Casalena, Kenneth Duren
Delayed positive responses of snowshoe hares to prescribed burning in a fire-adapted ecosystem Delayed positive responses of snowshoe hares to prescribed burning in a fire-adapted ecosystem
Wildlife populations near the periphery of a species’ range are vulnerable to changes in habitat conditions and climate. However, habitat management and maintenance can help with the persistence of these susceptible populations. Snowshoe hare (Lepus americanus) populations near the southern extent of their range are at risk of extirpation because of changing winter conditions, coupled...
Authors
Laura C. Gigliotti, Emily Boyd, Duane Diefenbach
Change-point models for identifying behavioral transitions in wild animals Change-point models for identifying behavioral transitions in wild animals
Animal behavior can be difficult, time-consuming, and costly to observe in the field directly. Innovative modeling methods, such as hidden Markov models (HMMs), allow researchers to infer unobserved animal behaviors from movement data, and implementations often assume that transitions between states occur multiple times. However, some behavioral shifts of interest, such as parturition...
Authors
K.P. Gundermann, Duane Diefenbach, W. David Walter, A Corondi, J.E. Banfield, B.D. Wallingford, D.P. Stainbrook, C.S. Rosenberry, F.E. Buderman
Soil and geomorphic patterns within relict charcoal hearths could represent unique ecosystem niches Soil and geomorphic patterns within relict charcoal hearths could represent unique ecosystem niches
Hearths used for 19th and 20th century charcoal manufacturing have been found to have unique plant communities or to produce unique growth characteristics for some species but not others. Given known differences in hearth morphology, within hearth physical and chemical differences may exist and result in unique ecologic niches. We examined soil stratigraphy across 8 relict charcoal...
Authors
S. Bayuzick, D. Guarin, J. Benavides, A. Bonhage, F. Hirsch, Duane Diefenbach, M. McDill, T. Raab, P.J. Drohan
Species and physiographic factors drive Indian cucumber root and Canada mayflower plant chemistry: Implications for white-tailed deer forage quality Species and physiographic factors drive Indian cucumber root and Canada mayflower plant chemistry: Implications for white-tailed deer forage quality
Nutrition is fundamental to white-tailed deer (Odocoileus virginianus) management given its relationship to habitat carrying capacity and population productivity. Ecological Sites (ESs) are a United States federal landscape management unit of specific land potential due to unique soils, topography, climate, parent material, and perhaps deer forage nutritional value. We present results of...
Authors
Nico Navarro, Duane Diefenbach, Marc E. McDill, Emily Domoto, Christopher Rosenberry, Patrick Drohan
Small anthropogenic landforms from past charcoal production control moisture dynamics and chemistry in northcentral Appalachian soils Small anthropogenic landforms from past charcoal production control moisture dynamics and chemistry in northcentral Appalachian soils
Throughout the northeastern United States (U.S.) and Europe, relict charcoal hearths (RCHs) are regularly being discovered in proximity to furnaces once used for the extraction of metal from ore or quick-lime production; charcoal produced in hearths was used as a furnace fuel. Given previous research has shown that topographic and subsurface disturbance can be great when a hearth is...
Authors
S. Bayuzick, D. Guarin, A. Bonhage, F. Hirsch, Duane Diefenbach, M. McDill, T. Raab, P.J. Drohan
Generalized Linear Mixed Models for Analyzing Wild Turkey Summer Sighting Data Generalized Linear Mixed Models for Analyzing Wild Turkey Summer Sighting Data
Observation of wild turkey (Meleagris gallopavo) are collected by many state wildlife agencies to monitor reproduction. This code demonstrates how to use generalized linear models to account for when and where data are collected, as well as how to combine data from multiple states to estimate parameters when data may be missing in some years. In addition, the code shows how to test for a...
Code for Distance sampling accounting for density gradient and animal distribution Code for Distance sampling accounting for density gradient and animal distribution
Code to estimate animal density from line transect surveys where auxiliary data are available to model the distribution of animals near the survey line and the distribution of animals across the study area.