Search Results - "Fedak, M. A."

Variations in behavior and condition of a Southern Ocean top predator in relation to in situ oceanographic conditions by Biuw, M, Boehme, L, Guinet, C, Hindell, M, Costa, D, Charrassin, J.-B, Roquet, F, Bailleul, F, Meredith, M, Thorpe, S, Tremblay, Y, McDonald, B, Park, Y.-H, Rintoul, S.R, Bindoff, N, Goebel, M, Crocker, D, Lovell, P, Nicholson, J, Monks, F, Fedak, M.A

“…Responses by marine top predators to environmental variability have previously been almost impossible to observe directly. By using animal-mounted instruments…”
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How long should a dive last? A simple model of foraging decisions by breath-hold divers in a patchy environment by Thompson, D., Fedak, M.A.

“…Although diving birds and mammals can withstand extended periods under water, field studies show that most perform mainly short, aerobic dives. Theoretical…”
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Southern Ocean frontal structure and sea-ice formation rates revealed by elephant seals by Charrassin, J.-B, Hindell, M, Rintoul, S.R, Roquet, F, Sokolov, S, Biuw, M, Costa, D, Boehme, L, Lovell, P, Coleman, R, Timmermann, R, Meijers, A, Meredith, M, Park, Y.-H, Bailleul, F, Goebel, M, Tremblay, Y, Bost, C.-A, McMahon, C.R, Field, I.C, Fedak, M.A, Guinet, C

“…Polar regions are particularly sensitive to climate change, with the potential for significant feedbacks between ocean circulation, sea ice, and the ocean…”
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The impact of animal platforms on polar ocean observation by Fedak, M.A.

“…The polar seas play a critical role in the climate system, forming important links between all oceans and between the atmosphere and deep sea. In addition,…”
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Consequences of Maternal Size for Reproductive Expenditure and Pupping Success of Grey Seals at North Rona, Scotland by Pomeroy, P. P., Fedak, M. A., Rothery, P., Anderson, S.

“…1. The reproductive performance of individually marked mothers aged between 4 and 36 years breeding at the established grey seal colony of North Rona, Scotland…”
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Movements and Foraging Areas of Grey Seals in the North Sea by McConnell, B. J., Fedak, M. A., Lovell, P., Hammond, P. S.

“…1. Grey seals Halichoerus grypus Fab. are large, numerous marine top predators. Fears concerning competition with fisheries have prompted calls for control…”
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Effects of Age and Body Mass on Development of Diving Capabilities of Gray Seal Pups: Costs and Benefits of the Postweaning Fast by Bennett, K. A., McConnell, B. J., Moss, Simon E. W., Speakman, J. R., Pomeroy, P. P., Fedak, M. A.

“…Development of adequate diving capabilities is crucial for survival of seal pups and may depend on age and body size. We tracked the diving behavior of 20 gray…”
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The role of glucocorticoids in naturally fasting grey seal (Halichoerus grypus) pups: dexamethasone stimulates mass loss and protein utilisation, but not departure from the colony by Bennett, K A, Fedak, M A, Moss, S E W, Pomeroy, P P, Speakman, J R, Hall, A J

“…Seals must manage their energy reserves carefully while they fast on land to ensure that they go to sea with sufficient fuel to sustain them until they find…”
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Unsteady-state gas exchange and storage in diving marine mammals: the harbor porpoise and gray seal by Boutilier, R G, Reed, J Z, Fedak, M A

“…Breath-by-breath measurements of end-tidal O(2) and CO(2) concentrations in harbor porpoise reveal that the respiratory gas exchange ratio (R(R); CO(2)…”
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Factors Affecting Maternal Expenditure in Southern Elephant Seals During Lactation by Arnbom, Tom, Fedak, M. A., Boyd, Ian L.

“…Southern elephant seals Mirounga leonina provide a unique opportunity for examination of parental investment because postpartum pup growth is fueled…”
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Cardiac responses of grey seals during diving at sea by THOMPSON, D, FEDAK, M. A

“…Heart rate, swimming speed and diving depth data were collected from free-ranging grey seals, Halichoerus grypus, as they foraged and travelled in the sea…”
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Approaches to Studying Climatic Change and its Role on the Habitat Selection of Antarctic Pinnipeds by Costa, Daniel P., Huckstadt, Luis A., Crocker, Daniel E., McDonald, Birgitte I., Goebel, Michael E., Fedak, Michael A.

“…Top predators integrate resources over time and space, and depending on the particular species they represent, different components of the marine environment…”
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Status and conservation of the grey seal, Halichœrus grypus, in France by VINCENT, C, FEDAK, M. A, MCCONNELL, B. J, MEYNIER, L, SAINT-JEAN, C, RIDOUX, V

“…We investigated the status of the grey seal in the Molene archipelago, western Brittany, where a Marine National Park is planned. We combined regular censuses,…”
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Measurement of the body composition of living gray seals by hydrogen isotope dilution by Reilly, J J, Fedak, M A

“…The body composition of living gray seals (Halichoerus grypus) can be accurately predicted from a two-step model that involves measurement of total body water…”
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Diurnal and seasonal variations in the duration and depth of the longest dives in southern elephant seals (Mirounga leonina): possible physiological and behavioural constraints by Bennett, K A, McConnell, B J, Fedak, M A

“…This study seeks to understand how the physiological constraints of diving may change on a daily and seasonal basis. Dive data were obtained from southern…”
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Post-Breeding Distribution and Diving Behavior of Adult Male Southern Elephant Seals from Patagonia by Campagna, Claudio, Fedak, Michael A., McConnell, Bernie J.

“…Seven post-breeding adult male southern elephant seals, Mirounga leonina, were tracked using satellite-relay data loggers (SRDL) in 1994-1996. Two animals also…”
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Estimating field metabolic rates of pinnipeds: doubly labelled water gets the seal of approval by Sparling, C. E., Thompson, D., Fedak, M. A., Gallon, S. L., Speakman, J. R.

“…1. Measures of the field metabolic rate of marine mammals are extremely difficult to make but they are essential for assessing the impacts of marine mammals on…”
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Gas exchange of captive freely diving grey seals (Halichoerus grypus) by REED, J. Z, CHAMBERS, C, FEDAK, M. A, BUTLER, P. J

“…When at sea, phocids dive for long periods and spend a high percentage of their time submerged. This behaviour requires some combination of an increased oxygen…”
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Gas exchange and heart rate in the harbour porpoise, Phocoena phocoena by Reed, J Z, Chambers, C, Hunter, C J, Lockyer, C, Kastelein, R, Fedak, M A, Boutilier, R G

“…The respiratory physiology, heart rates and metabolic rates of two captive juvenile male harbour porpoises (both 28 kg) were measured using a rapid-response…”
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The metabolic characteristics of the locomotory muscles of grey seals (Halichoerus grypus), harbour seals (Phoca vitulina) and antarctic fur seals (Arctocephalus gazella) by REED, J. Z, BUTLER, P. J, FEDAK, M. A

“…It is not known precisely how marine mammals are able to maintain muscle function during active swimming in breath-hold dives, when ventilation stops and heart…”
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