Search Results - "Johnson, Chris J"

Matrix condition mediates the effects of habitat fragmentation on species extinction risk by Ramírez-Delgado, Juan Pablo, Di Marco, Moreno, Watson, James E. M., Johnson, Chris J., Rondinini, Carlo, Corredor Llano, Xavier, Arias, Miguel, Venter, Oscar

“…Habitat loss is the leading cause of the global decline in biodiversity, but the influence of human pressure within the matrix surrounding habitat fragments…”
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Using camera traps and N‐mixture models to estimate population abundance: Model selection really matters by Koetke, Lisa Jeanne, Hodder, Dexter P., Johnson, Chris J.

“…Estimating the abundance or density of wildlife populations is a critical part of species conservation and management, but estimates can vary greatly in…”
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Resource Selection Functions Based on Use–Availability Data: Theoretical Motivation and Evaluation Methods by JOHNSON, CHRIS J, NIELSEN, SCOTT E, MERRILL, EVELYN H, MCDONALD, TRENT L, BOYCE, MARK S

“…Applications of logistic regression in a used–unused design in wildlife habitat studies often suffer from asymmetry of errors: used resource units (landscape…”
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Growth‐inducing infrastructure represents transformative yet ignored keystone environmental decisions by Johnson, Chris J., Venter, Oscar, Ray, Justina C., Watson, James E. M.

“…As the defining force of the Anthropocene, human enterprise is reshaping Earth's surface and climate. As part of that process, growth‐inducing infrastructure,…”
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Efficacy and ethics of intensive predator management to save endangered caribou by Johnson, Chris J., Ray, Justina C., St‐Laurent, Martin‐Hugues

“…Lethal population control has a history of application to wildlife management and conservation. There is debate about the efficacy of the practice, but more…”
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Incorporating mechanism into conservation actions in an age of multiple and emerging threats: The case of boreal caribou by DeMars, Craig A., Johnson, Chris J., Dickie, Melanie, Habib, Thomas J., Cody, Michael, Saxena, Amit, Boutin, Stan, Serrouya, Robert

“…Conservation strategies for imperiled species are frequently based on identifying and addressing the probable causes of population decline, an approach known…”
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High-Performance Liquid Chromatography Separation and Purification of Cacao (Theobroma cacao L.) Procyanidins According to Degree of Polymerization Using a Diol Stationary Phase by Kelm, Mark A, Johnson, J. Chris, Robbins, Rebecca J, Hammerstone, John F, Schmitz, Harold H

“…A new chromatographic approach for separating cacao procyanidins according to their degree of polymerization has been developed. It utilizes diol stationary…”
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Potential impacts of climate change on the habitat of boreal woodland caribou by Barber, Quinn E., Parisien, Marc‐André, Whitman, Ellen, Stralberg, Diana, Johnson, Chris J., St‐Laurent, Martin‐Hugues, DeLancey, Evan R., Price, David T., Arseneault, Dominique, Wang, Xianli, Flannigan, Mike D.

“…Boreal woodland caribou (Rangifer tarandus caribou) are currently listed as threatened in Canada, with populations in the province of Alberta expected to…”
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Foraging habitat drives the distribution of an endangered bat in an urbanizing boreal landscape by Thomas, Julie P., Kukka, Piia M., Benjamin, Justine E., Barclay, Robert M. R., Johnson, Chris J., Schmiegelow, Fiona K. A., Jung, Thomas S.

“…The boreal forest is the largest intact forest in the world, and a refuge for species experiencing range retractions as a consequence of climate and landscape…”
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Identifying ecological thresholds for regulating human activity: Effective conservation or wishful thinking? by Johnson, Chris J.

“…•Ecological thresholds are proposed as a method to identify acceptable levels of human activities.•Numerous definitions confound the identification and…”
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Den site selection of wolves (Canis lupus) in response to declining caribou (Rangifer tarandus groenlandicus) density in the central Canadian Arctic by Klaczek, Michael R., Johnson, Chris. J., Cluff, H. Dean

“…Wolves ( Canis lupus ) that den on the tundra of the central Arctic prey primarily on migratory barren-ground caribou ( Rangifer tarandus groenlandicus ). Prey…”
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Effect of behavioral marginality on survival of an alpine ungulate by Lesmerises, Frédéric, Johnson, Chris J., St‐Laurent, Martin‐Hugues

“…Inter‐individual variability in behavior has been studied extensively for a wide range of species. However, few researchers have considered marginality,…”
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Spatial and behavioral scales of habitat selection and activity by river otters at latrine sites by Crowley, Shannon, Johnson, Chris J., Hodder, Dexter

“…Animals interact with their environment at multiple spatial, temporal, and behavioral scales. Few studies of selection for latrine sites by river otters…”
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Evaluating the influence of anthropogenic landscape change on wolf distribution: implications for woodland caribou by Ehlers, Libby P. W., Johnson, Chris J., Seip, Dale R.

“…Abstract Across much of the range of woodland caribou ( Rangifer tarandus caribou ), predator–prey dynamics have changed as a result of large‐scale industrial…”
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Short term, but high risk of predation for endangered mountain caribou during seasonal migration by Blagdon, Duncan, Johnson, Chris J.

“…Migration occurs over a relatively short time period, but can result in an increased likelihood of mortality. Many populations of Southern Mountain Caribou, an…”
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Movement Parameters of Ungulates and Scale-Specific Responses to the Environment by Johnson, Chris J., Parker, Katherine L., Heard, Douglas C., Gillingham, Michael P.

“…1. Most studies of animal movements and habitat selection do not recognize empirically that different components of the environment are important to animals at…”
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A framework for modeling habitat quality in disturbance‐prone areas demonstrated with woodland caribou and wildfire by Whitman, Ellen, Parisien, Marc‐André, Price, David T., St‐Laurent, Martin‐Hugues, Johnson, Chris J., DeLancey, Evan R., Arseneault, Dominique, Flannigan, Mike D.

“…Natural resource management professionals require adaptable spatial tools for conserving and managing wildlife across landscapes. These tools should integrate…”
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Assessing noninvasive hair and fecal sampling for monitoring the distribution and abundance of river otter by Johnson, Chris J., Hodder, Dexter P., Crowley, Shannon

“…Monitoring the distribution and abundance of populations is an important component of efforts to meet management or conservation goals. Although the objectives…”
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Witnessing extinction – Cumulative impacts across landscapes and the future loss of an evolutionarily significant unit of woodland caribou in Canada by Johnson, Chris J., Ehlers, Libby P.W., Seip, Dale R.

“…•Habitat change is a major driver of species distribution and persistence.•We measured habitat loss over 22years for 5 subpopulations of woodland…”
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Long-term distribution responses of a migratory caribou herd to human disturbance by Johnson, Chris J., Russell, Don E.

“…•Many species demonstrate distributional responses to human disturbance.•Long-term responses to disturbance stimuli, including habituation, are not well…”
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