Comparative morphology and demography of Peromysaus maniaulatus Wagner from Ile Haute and mainland Nova Scotia.
LE3 .A278 1981
Bachelor of Science
Deer mice (Peromysous manioulatus Wagner) from Ile Haute and Bass River, Nova Scotia were examined primarily by snap-trapping between July 1980. and May 1981 in order to compare the morphology and demography of the two populations. The island population exhibited life history traits generally associated with K-selection. Density, based on trap success, was significantly greater on Ile Haute than at Bass River. Sex ratios on Ile Haute favored females, while those at Bass River were nearly 1:1. Litter size on Ile Haute did not differ significantly from that at Bass River, but was significantly smaller than litter size obtained from a collective sample from Nova Scotia. The Ile Haute population exhibited both a top-heavy age distribution and a significantly greater level of tail wounding for both sexes. Mean body weights and body lengths for both sexes of insular deer mice were significantly higher for most age classes. Body length/tail length ratios on Ile Haute and at Bass River did not differ; however, adult females from Ile Haute had relatively shorter tails than the collective sample of mainland females. Deer mice from Ile Haute represent a "relict" population that has probably been isolated for at least 7,000 a. This population exhibits distinct demographic and morphological traits similar to those reported in other insular deer mouse populations.
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