A Small Island Community in Midsummer

Abstract

In many respects a small island is an ideal laboratory for ecologic investigations. The limited area and, usually, the smaller numbers of individuals and species, as compared with the mainland, make it easier to census the fauna and flora and to comprehend the interrelationships that exist. Furthermore, the peculiar insular situation, with fewer habitats available and often with the absence of competition typical of larger areas, brings about special responses on the part of island animals which help to point up the more involved relationships existing in larger communities. Little Rogg Island, situated in Potagannissing Bay at the eastern extremity of Chippewa County, Michigan, is such a spot near the upper end of Lake Huron. The present study was undertaken with a view to the population and distribution of small mammals, and most attention was centered thereon. Partial results have been published elsewhere (Manville 1950b). During a month's time (July 2 to 30, 1949) observations and specimens of many other members of the community were collected. These data are presented herewith as an indication of the island complex, although no clear-cut picture of the various interrelationships was obtained. The community is of further interest as representing a repopulation by the fauna and flora since a severe fire many years ago.