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A possible discrepancy between the exposed and the whole population depending on range‐size and trap‐spacing in vole populations
Author(s) -
Tanaka Ryo
Publication year - 1966
Publication title -
population ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 59
eISSN - 1438-390X
pISSN - 1438-3896
DOI - 10.1007/bf02518799
Subject(s) - vole , trap (plumbing) , range (aeronautics) , population density , population , biology , radius , ecology , physics , materials science , demography , meteorology , sociology , composite material , computer security , computer science
Conclusion From a field study for the vole population ( Clethrionomys rufocanus ) in Hokkaido in the late summer of 1965, it has been proved that the range length may decrease from 25 to 18 m by the gross along with the rise from 20 to 100 in the density level per acre, and hence that an appreciable discrepancy, due to underestimation, may be produced in estimates of the exposed as compared to the whole population at an outbreaking density as high as 100 on a plan with trap‐spacing 10 m. In consideration of this together with my preceding results, the strict terms that we may enough approximate the whole one by estimating the exposed seem likely to be that the ratio of range radius to trap spacing, supposing a range is circular, should be near 2 or more at either ordinary or outbreaking densities, to say in the concrete, that the trap spacing as close as 5 m or so in grid is desirable with this vole, perhaps with most other voles.