highly significantP < 0.0001
Effect of removal of the guarding female When the guarding female was removed, the decrease in offspring survival was highly significant in both species (binomial GLM, C. cucurbitina : deviance = 39.18, df = 1, P < 0.0001, C. chalybea : deviance = 10.92, df = 1, P = 0.0009; Table 2 and Fig. 4 ).