Trapping data for Microtus pennsylvanicus

100 trap points spaced 7.6 m apart in a 10 X 10 pattern. This grid was live-trapped from July 4-6, 1978 to May 19-21, 1982. Initially it was trapped every two weeks throughout the year but near the end of the study, only in the snow free periods. The main trap used was the Longworth live trap. From the summer of 1979 onwards it was also trapped with pitfall traps (May-November). The following publications have reported various aspects of this data. The primary one which describes the site and its vegetation and gives an aerial shot of the area is Boonstra and Rodd (1983)