Microsatellite analysis of paternity and reproduction in Arctic grizzly bears

Article Abstract:

Understanding the breeding behavior of Arctic grizzly bears is necessary to attempt conservation. Therefore, observations were made on a group of 30 grizzly bear families, 152 bears, in northwestern Alaska. Males usually mate with only one female during a breeding season though some evidence supports multiple mating pairs and only 49% of mature males are successful breeders. Some litters include more than one male's DNA, indicating matings with multiple males, a condition more likely to occur when food is widely available because more females go into estrus. Tracking was accomplished through radiotelemetry and DNA fingerprinting.

Sexual behavior, Sexual behavior in animals, Animal sexual behavior, Breeding

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Genetic relationship of grizzly bears (Ursus arctos) in the Prudhoe Bay Region of Alaska: inference from microsatellite DNA, mitochondrial DNA and field observations

Article Abstract:

Parent-offspring and sibling relationships among grizzly bears in the Prudhoe Bay oil field region of northern Alaska were studied using field observations and molecular genetic data. Genotypes at 14 microsatellite DNA loci were determined and 17 possible mother-offspring pairs and eight possible father-offspring pairs were identified.

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Phylogenetic relationships of the Phasianidae reveals possible non-pheasant taxa

Article Abstract:

The phylogenetic relationships of 21 pheasant and 6 non-pheasant species are determined, using the nucleotide sequences from the mitochondrial cytochrome b gene. The results suggest that alterations in taxonomic classifications may be required for some pheasant species and genera.

Science & research, Genetic research, Cytochrome b, Phasianidae

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