Do cave carabid beetles really show character displacement in body size? [Pseudanophthalmus menetriesi, Pseudanophthalmus pubescens, Kentucky]

From examination of data, the authors conclude that : the reported direction of size change in Pseudanophthalmus menetriesi is real and highly significant; this size difference may not be directly related to coexistence with P. pubescens , because a reverse shift in relative sizes occurs where the two species coexist at the northwest corner of their ranges; and P. pubescens itself may possibly exhibit character displacement in size, because its populations have smaller mean lengths where its range overlaps that of P. menetriesi .