3-7 Sat Jan 2 Does eye morphology predict predator avoidance behavior in the Carolina grasshopper (Dissosteira carolina)? Brandley, NC*; Gilbert, FR; College of Wooster nbrandley@wooster.edu
Sensory organs are notoriously expensive to develop and maintain, and therefore face strong selective pressures to maximize detection of relevant information. As such, researchers often believe that an organism’s sensory systems should match their behavioral needs. However, the behavioral responses are often left untested, and sensory specializations may not act uniformly across all behavioral tasks. For example, Carolina grasshoppers (Dissosteira carolina) have unusual eyes that are both 1) sexually dimorphic (females have larger eyes with finer visual acuity) and 2) specialized for vision in the vertical axis. However, it is unknown whether either of these visual characteristics predict their behavior in response to approaching predators. Here, we present Carolina grasshoppers (n=67) with a series of computer-generated stimuli designed to exploit these visual differences while simultaneously recording their response via the EthoVision XT tracking system. Our results will elucidate whether particular characteristics of Carolina grasshopper’s eyes are matched to their predator avoidance behavior.