Geographic and genetic boundaries of brown bear (Ursus arctos) population in the Caucasus

@article{Murtskhvaladze2010GeographicAG,
  title={Geographic and genetic boundaries of brown bear (Ursus arctos) population in the Caucasus},
  author={Marine Murtskhvaladze and Alexander Gavashelishvili and David Tarkhnishvili},
  journal={Molecular Ecology},
  year={2010},
  volume={19}
}
The taxonomic status of brown bears in the Caucasus remains unclear. Several morphs or subspecies have been identified from the morphological (craniological) data, but the status of each of these subspecies has never been verified by molecular genetic methods. We analysed mitochondrial DNA sequences (control region) to reveal phylogenetic relationships and infer divergence time between brown bear subpopulations in the Caucasus. We estimated migration and gene flow from both mitochondrial DNA… 

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References

SHOWING 1-10 OF 86 REFERENCES

Phylogenetic Relationships Among Fragmented Asian Black Bear (Ursus Thibetanus) Populations in Western Japan

Since nuclear genetic diversity will be lost in the three western populations because of the small population size and genetic isolation, their habitats need to be preserved, and these four populations should be linked to each other by corridors to promote gene flow from the easternmost population with highernuclear genetic diversity.

Nuclear DNA microsatellite analysis of genetic diversity and gene flow in the Scandinavian brown bear (Ursus arctos)

This study extended the analysis of genetic diversity and gene flow in the Scandinavian brown bear using data from 19 nuclear DNA microsatellite loci and proposed one evolutionarily significant unit and four management units for the brown bear in Scandinavia.

Pre-pleistocene refugia and differentiation between populations of the caucasian salamander (Mertensiella caucasica).

A 350-bp fragment of the mitochondrial cytochrome-b gene was sequenced in the Caucasian salamander, Mertensiella caucasica, representing 10 populations from across its range along the Black Sea coast, showing parallel patterns in body proportions and coloration patterns.

Phylogeography and mitochondrial diversity of extirpated brown bear (Ursus arctos) populations in the contiguous United States and Mexico

The data are consistent with recent genetic evidence that brown bears were south of the ice prior to the last glacial maximum, and there is no support for previous subspecies designations, although bears of the southwestern United States may have had a distinctive, but recent, pattern of ancestry.

Variation in Skull Morphology of Brown Bears (Ursus arctos) from Caucasus

Multivariate analysis of cranial variables revealed the existence of three groups, or ecomorphs, apparent in both male and female Caucasian bears, which supported previous work that showed diversity in this group.

Microevolution of the mitochondrial DNA control region in the Japanese brown bear (Ursus arctos) population.

Investigating nucleotide sequences of the mitochondrial DNA control region to describe natural genetic variations and to assess the relationships between subpopulations of the brown bear Ursus arctos on Hokkaido Island, Japan found that most of the phylogenetically close haplotypes within each group were distributed geographically close to each other.

06. Ecological divergence between two evolutionary lineages of the Caucasian salamander: evidence from GIS analysis

The genetic isolation of these two lineages is caused by differential climatic requirements rather than by existing fragmentation of suitable habitats, suggesting that the species from the Greater Caucasus is explained by unsuitable climatic conditions.

The influence of climatic oscillations during the Quaternary Era on the genetic structure of Asian black bears in Japan

The extant genetic structure of the Asian black bear populations arose as follows: first, populations became small and genetic drift decreased genetic diversity in the northern area during the last glacial period, whereas large continuous populations existed in the southern part of central Japan.

Mitochondrial DNA Phylogeography of Black Bears (Ursus americanus) in Central and Southern North America: Conservation Implications

Abstract The American black bear (Ursus americanus) experienced a significant range contraction during the 19th and 20th centuries due to a variety of anthropogenic factors. Although previous

Geographic expansion of an increasing brown bear population: evidence for presaturation dispersal

The results strongly suggest that presaturation dispersal, i.e. dispersal occurring before the carrying capacity of the habitat has been reached, is occurring in this increasing population of brown bears in Sweden, and might be more common in increasing populations of large mammals than was previously thought.
...