dc.contributor.author | Stevison, Blake K. | |
dc.date.accessioned | 2014-09-24T14:18:18Z | |
dc.date.available | 2014-09-24T14:18:18Z | |
dc.date.issued | 2013-05-01 | |
dc.identifier.uri | https://hdl.handle.net/11244/11128 | |
dc.description.abstract | I examined how shell morphological defenses in freshwater snails (Physa sp.) influence patch choice and patch-use in response to predator cues. Behavioral responses were analyzed using a model comparison approach based on Akaike Information Criterion (AIC) to understand what morphological relationships and their interactions with predator cues best explained patch-use of the snails. I then tested alternative adaptive explanations for the morphological traits explaining patch-use by testing their effect on being killed by a predator in a no-choice predation study, as well as examining their influence on shell crush resistance. In this paper I also examined if the same type of cospecialization of complementary morphology and behavior found in earlier experiments occur between a behavior reducing the predator encounter rate, and morphological traits reducing the probability of surviving encounters with predators. I examined how shell morphology influences how physid snails use patches in the absence and presence of predator cues. I found that individuals with larger aperture lengths were more vulnerable to predators, and that more morphologically vulnerable individuals exhibited stronger antipredator behavior. Therefore, there is a compensatory relationship with an antipredator behavior and morphological defense that address different components of predation risk (i.e. reducing encounters with predators vs. increasing the probability of surviving such an encounter). I argue that separating predation risk into the two separate components of avoiding encounters and surviving encounters, can result in a better understanding of individual variation, and animal personalities in the context of predation risk. | |
dc.format | application/pdf | |
dc.language | en_US | |
dc.publisher | Oklahoma State University | |
dc.rights | Copyright is held by the author who has granted the Oklahoma State University Library the non-exclusive right to share this material in its institutional repository. Contact Digital Library Services at lib-dls@okstate.edu or 405-744-9161 for the permission policy on the use, reproduction or distribution of this material. | |
dc.title | How Shell Morphology Mediates Patch Use in Response to Predation Risk in Freshwater Snails | |
dc.type | text | |
osu.filename | Stevison_okstate_0664M_12754.pdf | |
osu.accesstype | Open Access | |
dc.description.department | Zoology | |
dc.type.genre | Thesis | |