Habitat and reproduction of some of the small mammals of Vigo County, Indiana, with a list of mammals known to occur there

Whitaker, J.O.

Occas Papers Cc Adams Center Ecol Stud Wes Mich Univ 16: 1-24

1967


Accession: 022740929

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Abstract
A study of the mammals of Vigo County, Indiana, was conducted from Aug. 1962 to Aug. 1965. A total of 2785 mammals was examined, including 1506 taken by means of-snap-trapping in 429 to 500 randomly selected 25 x 25 m plots. A total of 42 spp. was taken during the study. Blarina brevicauda and Microtus pinetorum were mainly in upland woods in Vigo County. Microtus pennsylvanicus was found only in grassy fields with good cover especially in those with moist soil. M. ochrogaster was more common than M. pennsylvanicus and was relatively abundant in grassy fields, weedy fields, and cultivated fields. It was significantly more common in areas of better cover but was not significantly more common in: areas with moist soil than in areas with dry soil. Peromyscus maniculatus bairdi and Mus musculus were the most abundant sp. of small mammals of Vigo County and both occurred generally in the same type of habitats including nearly all cultivated situations. P. m. bairdi was the only sp. regularly occurring in plowed fields or on bare ground and significantly more mice of this species were taken in areas with less gound cover. There was a significant association of M. musculus with areas of better cover. Apparently there were seasonal movements of the sp. into areas with adequate cover when previously existing habitats were destroyed at harvest or plowing time. Peromyscus leucopus was common in the wooded habitats, including brushy fields, but was also found in grassy fields and in winter wheat fields. The average number of embryos was 4.73 in 62 pregnant female P. m. bairdi, 4.25 in 20 pregnant P. leucopus and 6.02 in 48 pregnant M. musculus. The system of sampling used turned up all but one sp. of small mammals known to occur in the county and which reasonably would be expected to occur in mouse traps.