The use of index trap lines to estimate population numbers of deermice (Peromyscus maniculatus) in a forest environment in British Columbia

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Abstract
Monthly live trapping of three 1-hectare grids in differing forest habitats was carried out over an 8-month period. Immediately after 2 nights of trapping on each grid a central index line was trapped for a further 2 nights. The total capture numbers., numbers of males, and numbers of females of deermice (Peromyscus maniculatus) on the index line correlated significantly with the same parameters on the grid. In addition, survival rates and body weights were almost identical and similar representation of other small mammal species was determined by both arrangements of traps. It is suggested that the index line may be a more efficient method of sampling small mammal populations.
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