Search Results - "Hobson, K. A"

Methylmercury photodegradation influenced by sea-ice cover in Arctic marine ecosystems by Point, D, Moors, A. J, Hobson, K. A, Vander Pol, S. S, Pugh, R. S, Roseneau, D. G, Becker, P. R, Sonke, J. E, Donard, O. F. X, Day, R. D

“…Atmospheric deposition of mercury to remote areas has increased threefold since pre-industrial times. Mercury deposition is particularly pronounced in the…”
Get full text

Multidimensional natal isotopic niches reflect migratory patterns in birds by Franzoi, A., Larsen, S., Franceschi, P., Hobson, K. A., Pedrini, P., Camin, F., Bontempo, L.

“…Naturally occurring stable isotope ratios in animal tissues allow estimation of species trophic position and ecological niche. Measuring multiple isotopes of…”
Get full text

Publisher Correction: Multidimensional natal isotopic niches reflect migratory patterns in birds by Franzoi, A., Larsen, S., Franceschi, P., Hobson, K. A., Pedrini, P., Camin, F., Bontempo, L.

Get full text

Comparative equilibration and online technique for determination of non-exchangeable hydrogen of keratins for use in animal migration studies by Wassenaar, L. I., Hobson, K. A.

“…Stable hydrogen-isotope ratios (δD) of keratin provide a novel means for tracking geographical movements of birds and other species. Here we describe a rapid,…”
Get full text

Using Stable Isotopes to Study Resource Acquisition and Allocation in Procellariiform Seabirds by Cherel, Y., Hobson, K. A., Weimerskirch, H.

“…Some procellariiform seabirds use a dual strategy for provisioning their chicks by alternating short (ST) and long (LT) foraging trips. Parent birds gain mass…”
Get full text

A multi-isotope (δ13C, δ15N, δ2H) feather isoscape to assign Afrotropical migrant birds to origins by Hobson, K. A, Van Wilgenburg, S. L, Wassenaar, L. I, Powell, R. L, Still, C. J, Craine, J. M

“…A universal challenge in methodology used to study the ecology, conservation and evolutionary biology of migratory species is the quantification of…”
Get full text

Widely distributed breeding populations of Canada warbler (Cardellina canadensis) converge on migration through Central America by Roberto-Charron, A., Kennedy, J., Reitsma, L., Tremblay, J. A., Krikun, R., Hobson, K. A., Ibarzabal, J., Fraser, K. C.

“…Abstract Background To effectively conserve migratory species, the entire range encompassed by their annual life cycle needs to be considered. Most research on…”
Get full text

Long-term changes of mercury levels in ringed seal ( Phoca hispida) from Amundsen Gulf, and beluga ( Delphinapterus leucas) from the Beaufort Sea, western Canadian Arctic by Outridge, P.M., Hobson, K.A., Savelle, J.

“…Mercury (Hg) concentrations were determined in the canine teeth of ringed seals ( Phoca hispida) harvested during the 13th–14th, late 19th and early 21st…”
Get full text

Using Stable-Isotope Analysis of Feathers to Distinguish Moulting and Breeding Origins of Seabirds by Cherel, Yves, Hobson, Keith A., Weimerskirch, Henri

“…To determine whether stable isotope measurements of bird feathers can be used to identify moulting (interbreeding) foraging areas of adult seabirds, we…”
Get full text

Influence of Chemical and Biological Factors on Trophic Transfer of Persistent Organic Pollutants in the Northwater Polynya Marine Food Web by Fisk, Aaron T, Hobson, Keith A, Norstrom, Ross J

“…Persistent organic pollutants (POPs) and stable isotopes of nitrogen (δ15N) were measured in zooplankton (6 species), a benthic invertebrate (Anonyx nugax),…”
Get full text

Linking Breeding and Wintering Grounds of Neotropical Migrant Songbirds Using Stable Hydrogen Isotopic Analysis of Feathers by Hobson, Keith A., Wassenaar, Leonard I.

“…Recent studies have shown that stable hydrogen isotope ratios (δD) in the tissues of animals often correlate with δD of local precipitation. Here we examined…”
Get full text

Conspecific Food Competition Explains Variability in Colony Size: A Test in Magellanic Penguins by Forero, M. G., Tella, J. L., Hobson, K. A., Bertellotti, M., Blanco, G.

“…Food availability has been proposed as one of the main factors regulating population sizes in birds. Seabirds have provided evidence for the hypothesis that…”
Get full text

Ecological factors differentially affect mercury levels in two species of sympatric marine birds of the North Pacific by Hipfner, J.M., Hobson, K.A., Elliott, J.E.

“…In 2003 and 2004, we measured mercury concentrations and δ 15N and δ 13C values in the whole blood of adults of two species of seabirds, Cassin's auklet (…”
Get full text

Contaminant residues in seabird eggs from the Canadian Arctic. II. Spatial trends and evidence from stable isotopes for intercolony differences by Braune, B.M, Donaldson, G.M, Hobson, K.A

“…Eggs of four species of seabirds from colonies in the Canadian Arctic were examined for contaminant concentrations. Eggs of glaucous gulls ( Larus…”
Get full text

Chernobyl as a Population Sink for Barn Swallows: Tracking Dispersal Using Stable-Isotope Profiles by Møller, A. P., Hobson, K. A., Mousseau, T. A., Peklo, A. M.

“…Stable-isotope profiles of feathers can reveal the location or habitat used by individual birds during the molting period. Heterogeneity in isotope profiles…”
Get full text

Stable isotope and band-encounter analyses delineate migratory patterns and catchment areas of white-throated sparrows at a migration monitoring station by Mazerolle, D. F, Hobson, K. A, Wassenaar, L. I

“…The Canadian Migration Monitoring Network consists of several fixed migration monitoring stations (MMS) that apply constant-effort protocols to track changes…”
Get full text

Contaminant residues in seabird eggs from the Canadian Arctic. Part I. Temporal trends 1975–1998 by Braune, B.M, Donaldson, G.M, Hobson, K.A

“…Concentrations of total mercury, selenium and a suite of organochlorine compounds were measured in the eggs of three species of birds. Concentrations of total…”
Get full text

Using Stable Isotopes to Determine Seabird Trophic Relationships by Hobson, Keith A., Piatt, John F., Pitocchelli, Jay

“…1. The stable isotopes of nitrogen (delta 15N) and carbon (delta 13C) were analysed in 22 species of marine birds from coastal waters of the northeast Pacific…”
Get full text

Influence of Drinking Water and Diet on the Stable-Hydrogen Isotope Ratios of Animal Tissues by Hobson, Keith A., Atwell, Lisa, Wassenaar, Leonard I.

“…Despite considerable interest in using stable-hydrogen isotope ratio (δ D) measurements in ecological research, it was previously unknown whether hydrogen…”
Get full text

Baleen as a biomonitor of mercury content and dietary history of North Atlantic Minke Whales ( Balaenopetra acutorostrata): combining elemental and stable isotope approaches by Hobson, K.A., Riget, F.F., Outridge, P.M., Dietz, R., Born, E.

“…Baleen is an incrementally-growing tissue of balaenopteran whales which preserves relatively well over time in museums and some archeological sites, and,…”
Get full text