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Gregarious pupation act as a defensive mechanism against cannibalism and intraguild predation

Insect Science 2016年第4期23卷 612-620页

作者： Claudia Roberge Bruno Frechette genevieve labrie Francois Dumont Eric Lucas Universite du Quebec a Montreal Departement des Sciences Biologiques CP 8888 Succ. Centre Ville Montreal Centre de recherche sur les grains Inc (CEROM) 740 chemin Trudeau St-Mathieu-de-Beloeil Quebec J3G OE2 Canada

Coccinellid pupae use an array of defensive strategies against their natural enemies. This study aims to assess the efficiency of gregarious pupation as a defensive mechanism against intraguild predators and cannibals in coccinellid. The study was designed specifically （i） to determine the natural occurrence of gregarious pupation in the field for different coccinellid species, and （ii） to evaluate the adaptive value of gregarious pupation as a defensive mechanism against 2 types of predators （i.e., cannibals and intraguild predators）. In the field, gregarious pupation consisted of a group of 2-5 pupae. The proportion of gregarious pupation observed varied according to species, the highest rate being observed with Harmonia axyridis Pallas （Coccinellidae; 14.17%）. Gregarious pupation had no impact on the probability that intraguild predators and cannibals locate pupae. Intraguild predation occurred more often in site with gregarious pupation, while cannibalism occurred as often in site with gregarious pupation as in site with isolated pupa. However, for a specific pupa, the mortality rate was higher for isolated pupae than for pupae located in a gregarious pupation site both in the presence of intraguild predators and in the presence of cannibals. The spatial location of pupae within the group had no impact on mortality rate. Since it reduces the risk of predation, it is proposed that gregarious pupation act as a defensive mechanism for 11. axyridis pupae.

关键词： attack abatement Coccinellidae dilution effect encounter effect grouping behavior Pentatomidae Selfish herd

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