Search Results - "Rockwell, Robert F."

Artificial intelligence for automated detection of large mammals creates path to upscale drone surveys by Lenzi, Javier, Barnas, Andrew F., ElSaid, Abdelrahman A., Desell, Travis, Rockwell, Robert F., Ellis-Felege, Susan N.

“…Imagery from drones is becoming common in wildlife research and management, but processing data efficiently remains a challenge. We developed a methodology for…”
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What to eat now? Shifts in polar bear diet during the ice‐free season in western Hudson Bay by Gormezano, Linda J., Rockwell, Robert F.

“…Under current climate trends, spring ice breakup in Hudson Bay is advancing rapidly, leaving polar bears (Ursus maritimus) less time to hunt seals during the…”
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A comparison of drone imagery and ground-based methods for estimating the extent of habitat destruction by lesser snow geese (Anser caerulescens caerulescens) in La Pérouse Bay by Barnas, Andrew F, Darby, Brian J, Vandeberg, Gregory S, Rockwell, Robert F, Ellis-Felege, Susan N

“…Lesser snow goose (Anser caerulescens caerulescens) populations have dramatically altered vegetation communities through increased foraging pressure. In remote…”
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The Energetic Value of Land-Based Foods in Western Hudson Bay and Their Potential to Alleviate Energy Deficits of Starving Adult Male Polar Bears by Gormezano, Linda J, Rockwell, Robert F

“…Climate change is predicted to expand the ice-free season in western Hudson Bay and when it grows to 180 days, 28-48% of adult male polar bears are projected…”
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Bear presence attracts avian predators but does not impact lesser snow goose daily nest attendance by Barnas, Andrew F., Darby, Brian J., Iles, David T., Koons, David N., Rockwell, Robert F., Semeniuk, Christina A. D., Ellis‐Felege, Susan N.

“…The presence of foraging bears in Arctic breeding bird colonies has been increasingly reported in the literature, and these may constitute disturbance events…”
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Effects of Landscape Features on the Distribution and Sustainability of Ungulate Hunting in Northern Congo by MOCKRIN, MIRANDA H., ROCKWELL, ROBERT F., REDFORD, KENT H., KEULER, NICHOLAS S.

“…Understanding the spatial dimensions of hunting and prey population dynamics is important in order to estimate the sustainability of hunting in tropical…”
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Increased variance in temperature and lag effects alter phenological responses to rapid warming in a subarctic plant community by Mulder, Christa P. H., Iles, David T., Rockwell, Robert F.

“…Summer temperature on the Cape Churchill Peninsula (Manitoba, Canada) has increased rapidly over the past 75 years, and flowering phenology of the plant…”
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Shifting Vital Rate Correlations Alter Predicted Population Responses to Increasingly Variable Environments by Iles, David T, Rockwell, Robert F, Koons, David N

“…Time series of vital rates are often used to construct "environment-blind" stochastic population projections and calculate the elasticity of population growth…”
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Effects of exploitation on an overabundant species: the lesser snow goose predicament by Koons, David N, Rockwell, Robert F, Aubry, Lise M, David, Koons

“…Invasive and overabundant species are an increasing threat to biodiversity and ecosystem functioning world‐wide. As such, large amounts of money are spent each…”
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A pilot(less) study on the use of an unmanned aircraft system for studying polar bears (Ursus maritimus) by Barnas, Andrew F., Felege, Christopher J., Rockwell, Robert F., Ellis-Felege, Susan N.

“…Unmanned aircraft systems (UAS) are increasingly popular tools for studying wildlife ecology. The non-invasive aspect of UAS and the ability to collect a large…”
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Reproductive success of a keystone herbivore is more variable and responsive to climate in habitats with lower resource diversity by Iles, David T., Rockwell, Robert F., Koons, David N.

“…1. The effects of climate on wild populations are often channelled through species interactions. Population responses to climate variation can therefore differ…”
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Liberalized harvest regulations have not affected overabundant Snow Geese in Northern Manitoba by Koons, David N, Aubry, Lise M, Rockwell, Robert F

“…Large amounts of money are spent each year to control overabundant species that imperil biodiversity and ecosystem functioning across the globe. Lesser Snow…”
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Subpopulation contributions to a breeding metapopulation of migratory arctic herbivores: survival, fecundity and asymmetric dispersal by Alisauskas, Ray T., Calvert, Anna M., Leafloor, James O., Rockwell, Robert F., Drake, Kiel L., Kellett, Dana K., Brook, Rodney W., Abraham, Kenneth F.

“…Estimates of demographic parameters for lesser snow geese Anser caerulescens caerulescens have become critical to understand ecosystem change in northern…”
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Can controlled bow hunts reduce overabundant white-tailed deer populations in suburban ecosystems? by Weckel, Mark, Rockwell, Robert F.

“…► We model the impact of bow hunting on suburban populations of white-tailed deer. ► We examine changes to deer harvest rates as a function of deer density. ►…”
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Climate change, phenology, and habitat degradation: drivers of gosling body condition and juvenile survival in lesser snow geese by Aubry, Lise M, Rockwell, Robert F, Cooch, Evan G, Brook, Rodney W, Mulder, Christa P. H, Koons, David N

“…Nesting migratory geese are among the dominant herbivores in (sub) arctic environments, which have undergone unprecedented increases in temperatures and plant…”
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Kin grouping is insufficient to explain the inclusive fitness gains of conspecific brood parasitism in the common eider by Hervey, Samuel D., Barnas, Andrew F., Stechmann, Tanner J., Rockwell, Robert F., Ellis‐Felege, Susan N., Darby, Brian J.

“…Conspecific brood parasitism allows females to exploit other females' nests and enhance their reproductive output. Here, we test a recent theoretical model of…”
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Trophic matches and mismatches: can polar bears reduce the abundance of nesting snow geese in western Hudson Bay? by Rockwell, Robert F., Gormezano, Linda J., Koons, David N.

“…Climate change driven advances in the date of sea ice breakup will increasingly lead to a loss of spring polar bear foraging opportunities on ringed seal pups…”
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A phenological comparison of grizzly (Ursus arctos) and polar bears (Ursus maritimus) as waterfowl nest predators in Wapusk National Park by Barnas, Andrew F., Iles, David T., Stechmann, Tanner J., Wampole, Erin M., Koons, David N., Rockwell, Robert F., Ellis-Felege, Susan N.

“…Relatively little is known about the feeding ecology of grizzly bears ( Ursus arctos ) in Wapusk National Park. Other ursids, polar bears ( Ursus maritimus ),…”
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Evaluating behavioral responses of nesting lesser snow geese to unmanned aircraft surveys by Barnas, Andrew, Newman, Robert, Felege, Christopher J., Corcoran, Michael P., Hervey, Samuel D., Stechmann, Tanner J., Rockwell, Robert F., Ellis‐Felege, Susan N.

“…Unmanned aircraft systems (UAS) are relatively new technologies gaining popularity among wildlife biologists. As with any new tool in wildlife science,…”
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Dietary composition and spatial patterns of polar bear foraging on land in western Hudson Bay by Gormezano, Linda J, Rockwell, Robert F

“…Flexible foraging strategies, such as prey switching, omnivory and food mixing, are key to surviving in a labile and changing environment. Polar bears (Ursus…”
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