Does a single meal affect female reproductive output in the sexually cannibalistic praying mantid Iris oratoria?
2000
Maxwell, M.R.
1. One explanation of the evolution of sexual cannibalism, the female's consumption of a male during or following courtship or copulation, is that this behaviour increases the female's fitness. This study tests the assumption that a single meal increases female reproductive output significantly in the sexually cannibalistic praying mantid Iris oratoria L. 2. In 38 mating trials, seven of the females cannibalised the males. In order to augment the number of females that fed, an additional nine females were each fed one cricket nymph at the end of the mating trial. 3. Three measures of female reproductive output--the occurrence of oviposition, the mass of the first ootheca, and the number of eggs in the first ootheca increased significantly with female feeding condition, which was a reflection of food consumed before the mating trial. Females that copulated later in the season tended to lay lighter oothecae. 4. The females' consumption of a meal during the mating trial, either a conspecific male or a cricket, did not influence any measure of reproductive output significantly, although possible effects upon subsequent oothecae cannot be ruled out. 5. If, as the present study suggests, a single meal provides a negligible or delayed benefit to female reproductive output, the evolution of sexual cannibalism might lie in alternative explanations, which include possible fitness benefits to cannibalistic females in the nymphal stage or possible paternity benefits to the cannibalised males.
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