Polar and brown bear genomes reveal ancient admixture and demographic footprints of past climate change
- W. Miller, S. Schuster, C. Lindqvist
- Biology, Environmental ScienceProceedings of the National Academy of Sciences
- 23 July 2012
It is demonstrated that brown bears and PBs have had sufficiently independent evolutionary histories over the last 4–5 million years to leave imprints in the PB nuclear genome that likely are associated with ecological adaptation to the Arctic environment.
Phylogeography of brown bears (Ursus arctos) of Alaska and paraphyly within the Ursidae.
- S. Talbot, G. Shields
- BiologyMolecular Phylogenetics and Evolution
- 1 June 1996
The mtDNA data support some, but not all, of the currently designated subspecies of brown bears whose descriptions have been based essentially on morphology, and a weak correlation is suggested between types of mtDNA and habitat preference by brown bears in Alaska.
Complete mitochondrial genome of a Pleistocene jawbone unveils the origin of polar bear
- C. Lindqvist, S. Schuster, Ø. Wiig
- Environmental ScienceProceedings of the National Academy of Sciences
- 1 March 2010
It is shown that the phylogenetic position of the ancient polar bear lies almost directly at the branching point between polar bears and brown bears, elucidating a unique morphologically and molecularly documented fossil link between living mammal species.
A phylogeny of the bears (Ursidae) inferred from complete sequences of three mitochondrial genes.
- S. Talbot, G. Shields
- BiologyMolecular Phylogenetics and Evolution
- 1 June 1996
Calibration of the corrected average number of nucleotide differences per site with the fossil record indicates that transitions at third positions of codons in the ursid cytochrome b gene occur at a rate of approximately 6% per million years, which is considerably slower than comparable values reported for other species of mammal.
An Ice Age Refugium for Large Mammals in the Alexander Archipelago, Southeastern Alaska
- T. Heaton, S. Talbot, G. Shields
- Environmental ScienceQuaternary Research
- 1 September 1996
Genetic and paleontological evidence are combining to provide a new and surprising picture of mammalian biogeography in southeastern Alaska. Prior to our study, the brown and black bears of the…
Mitochondrial DNA Phylogeography of the North American Brown Bear and Implications for Conservation
- L. Waits, S. Talbot, R. H. Ward, G. Shields
- Biology, Environmental Science
- 1 April 1998
The mitochondrial DNA phylogeographic clades do not correlate with taxonomic classifications for U. arctos, and it is hypothesize that the clades were formed prior to migration of this species into North America.
Flexibility in the parental effort of an Arctic-breeding seabird
- A. Harding, A. Kitaysky, D. Grémillet
- Biology
- 1 April 2009
There may be a threshold to the additional reproductive costs breeders will accept, with parents prioritizing self-maintenance over increased provisioning effort when foraging costs become too high, as predicted by life-history theory.
Epizootic of Beak Deformities Among Wild Birds in Alaska: An Emerging Disease in North America?
- C. Handel, Lisa M. Pajot, K. A. Trust
- Environmental Science
- 11 November 2010
An unusual concentration of beak deformities that appear to have arisen rapidly within Alaska and now extend southward along the Pacific Coast is described, which may represent a systemic disorder or secondary conditions.
Population genetic structure of annual and perennial populations of Zostera marina L. along the Pacific coast of Baja California and the Gulf of California
- R. Muñiz-Salazar, S. Talbot, G. K. Sage, D. Ward, A. Cabello‐Pasini
- Biology, Environmental ScienceMolecular Ecology
- 7 February 2005
The test for isolation by distance (IBD) showed a significant correlation between genetic and geographical distances in Gulf of California populations, but not in Pacific coast populations, perhaps because of shifts in currents during El Niño Southern Oscillation (ENSO) events along the Pacific coast.
Genetic variation, relatedness, and effective population size of polar bears (Ursus maritimus) in the southern Beaufort Sea, Alaska.
- M. Cronin, S. Amstrup, S. Talbot, G. K. Sage, Kristin S. Amstrup
- Environmental ScienceJournal of Heredity
- 1 November 2009
Assessment of parentage and relatedness of polar bears in the southern Beaufort Sea, Alaska, with genetic data and field observations of age, sex, and mother-offspring and sibling relationships confirms and expands field data on reproduction by females and provides new data on reproduce by males and estimates of relatedness and N(e) in a polar bear population.
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