Seasonal reproductive patterns for the 11 terrestrial isopod species found in Wisconsin are presented. The pattern of the most widespread species, Trachelipus rathkei, is examined hi detail through a series of paired north/south samplings which reveal a seasonal lag in the percent of females which were gravid in populations from the northern part of the state. A difference in sex ratio between north and south samples is reported.
Joan, J. and B. Klausmeier. 1996. Comparison of Wisconsin terrestrial isopods and their life cycle traits. 29(2): 14-26.