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. Field Station Bulletin 29(2): 14-26.