a nonsignificant trendP = 0.07
Twelve of the 13 birds showed significant clumping of lice within central regions (Morisita’s index, χ 2 = 88–743; P < 0.01 for all comparisons), whereas 1 bird showed a nonsignificant trend (Moristia’s index, χ 2 = 66, P = 0.07).