A 3-year live-trapping study of deer mice was carried out on separate 1-hectarc (ha) grids located in a mature forest, a recently logged area, and a young plantation. Despite apparent gross differences in the habitats, populations on the recently logged area were similar in numbers, survival, and recruitment to those in the mature forest. There were greater differences in population parameters between years than between these two areas. Populations of deer mice in the young plantation were lower in numbers and eventually went to extinction in the summer of 1970. This appeared to be due rather to the presence of numerous Microtus oregoni in this area than to the habitat being less suitable for deer mice.On the basis of this and previous studies it is proposed that the numbers of deer mice in a population are regulated as follows. During breeding seasons the numbers of males and juveniles are regulated by agonistic male behavior while the numbers of females may be a function of the length of the breeding season. During non-breeding seasons the changes in numbers of all deer mice are regulated by the length of such seasons.
Beaver colony site density was sampled on 136 lakes (about 1830 shoreline km) and 45 stream sections (145 stream km) in the northern interior of British Columbia. Beaver habitat factors were quantified and then related to beaver colony site density by multiple regression analysis. On the basis of separate analysis for lakes and streams, a land capability classification system was developed for beaver. The regression equations are also useful as models of beaver–habitat relationships and can be used for beaver inventory by prediction of beaver colony site density.Conservation of existing aspen (Populus tremuloides) stands, common throughout the beaver's range, is considered the most powerful management tool for maintaining or enhancing present beaver land capability.
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