Meeting Abstract
Given their size and relative trophic level, many insect species occupy a relatively basal position on the food chain. They act as potential prey items for a variety of predators and it would often seem that they have little choice in the matter. However, recent studies have shown that cockroaches and other insects can employ a wide array of antipredator behaviors that can substantially impact their odds of becoming dinner. In this study we examined potential antipredator behavior of the Madagascar hissing cockroach (Gromphadorhina portentosa) to two representative, but physiologically and behaviorally distinct, predators, the Brazilian pink-toed tarantula (Lasiodora parahybana) and the Asian forest scorpion (Heterometrus spinifer). These two predatory species have opposing sensory structures for attacking prey, different predation strategies and different feeding patterns. As such we predicted that predator species could be associated with contrasting Gromphadorhina portentosa defensive behaviors. Additionally, we explored patterns of aggression and defense in relation to various size differentials between predators and prey. Positing that the potential prey might alter their strategies in relation to the relative size differences between themselves and the predator. We captured the range of antipredator responses used in these interactions, and their efficacy, through the use of time-lapse and high-speed video. Here we discuss these results and their implications for predator-prey interactions and evolution.
