Phenotypic Variation in Skull Size and Shape Between Newfoundland and Mainland Populations of North American Black Bears

The Canadian Field-Naturalist
John A. Virgl, Shane P. Mahoney, and Kim Mawhinney

It is well recognized that differences in environmental selection pressures among populations can generate phenotypic divergence in a suite of morphological characteristics and associated life history traits. Previous analysis of mitochondrial DNA and body size have suggested that Black Bears (Ursus americanus) inhabiting the island of Newfoundland represent a different subspecies or ecotype from mainland populations.