Figure 2.

Negative association between the number of sperm recovered from the caput epididymis and the number of scent marks deposited in a standardized scent-marking assay among both ‘high-competition’ (open squares; n=16, r=−0.464, p=0.07) and ‘low-competition’ (filled squares; n=13, r=−0.581, p=0.04) males. Overall, there is a significant negative association between scent marking and sperm counts, as indicated by the significant effect of scent marking in a general linear model containing epididymal sperm count as the dependent variable and treatment group as a fixed factor (scent-marking effect: F_1,26=10.23, p=0.004; treatment group effect: F_1,26=32.31, p<0.001).