Our experiment was consistent with our hypothesis of competition for traps with M.
For every capture event of a vole at the IN study site, a field assessment of species identity was made based on differences between Microtus ochrogaster and M.
In addition, preserved skulls of three Microtus ochrogaster and four M.
Microtus ochrogaster typically have five plantar tubercles and a tail length:hind foot length ratio <2, while in M.
For the males collected from the IN site, only one of 13 voles (8%) with a Microtus ochrogaster avpr1a genotype had an atypical number of plantar tubercles (six rather than five), while both of the voles with M.
Getz (1963) reported that metabolic water production was sufficient to meet 15% of the water requirements of M.
Comparisons of population demography of Microtus ochrogaster and M.
The rationale for such amounts of precipitation was that, from field observations, this amount of rain in such short periods of time had the potential to flood underground nests of Microtus ochrogaster and the surface nests of M.
An episode of extreme weather was not associated with cessation of growth of any of the five population fluctuations of M.
Either survival or the proportion of reproductively active females was [greater than or equal to]20% lower the 3 mo after than before the peak of two of the four M.
Episodes of extreme weather occurred during 24 of 39 increase phases of population fluctuations of Microtus ochrogaster and during 15 of 20 increase phases of M.
The 21 lines in dry or moist fields yielded all of the species taken except for M.
Thus comparing trap success for the different habitat types during these months, M.
cooperi is now rarely caught in forest clearings, whereas M.
Linzey (1983) stated that isolated, man-made clearings in eastern forests are not readily colonized by Microtus pennsylvanicus and are favored by Synaptomys cooperi, although the clearing of eastern woodlands and replacement of native grasses by introduced species favors M.