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dc.contributor.advisorSmee, Delbert Lee
dc.contributor.authorCastleberry, Cole
dc.date.accessioned2018-12-19T21:59:29Z
dc.date.available2018-12-19T21:59:29Z
dc.date.issued2018-08
dc.identifier.urihttps://hdl.handle.net/1969.6/87103
dc.description.abstractPrey respond to predation risk by implementing defensive mechanisms such as avoidance behavior, interrupting the periodicity of their life history, and altering their morphology. Prey employ defensive mechanisms at a cost to traditional fitness strategies such as growth or fecundity. The severity of response is correlated with the level of risk the organism perceives. In the marine environment, chemical cues play a large role in prey risk assessment, especially in bivalves. I tested the morphological response of oysters (Crassostrea virginica) to blue crabs (Callinectes sapidus) reared on diets of mud crabs (Panopeus herbstii) or conspecific oysters to measure the differential response of C. virginica to intraguild predation and conspecific cues. I hypothesized that oysters exposed to the exudate of blue crabs consuming mud crabs, a natural oyster predator, would respond by growing stronger, heavier shells, but that oysters exposed to blue crabs consuming oysters would grow shells that were significantly stronger and heavier. Oysters exposed to the oyster cue grew significantly lighter but stronger shells than oysters exposed to mud crab (intraguild) cues and controls. Intraguild cue oysters produced the smallest and weakest shells, but maintained a shell weight intermediate to oyster cue and control groups. The results support the hypothesis in part due to the significant increases in strength of the oyster cue treatment, but their low weight was unexpected, as was the reaction seen in the mud crab cue treatment.en_US
dc.format.extent33 pagesen_US
dc.language.isoen_USen_US
dc.rightsThis material is made available for use in research, teaching, and private study, pursuant to U.S. Copyright law. The user assumes full responsibility for any use of the materials, including but not limited to, infringement of copyright and publication rights of reproduced materials. Any materials used should be fully credited with its source. All rights are reserved and retained regardless of current or future development or laws that may apply to fair use standards. Permission for publication of this material, in part or in full, must be secured with the author and/or publisher.en_US
dc.subjectblue crabsen_US
dc.subjectmorphologyen_US
dc.subjectnon-consumptive effectsen_US
dc.subjectoystersen_US
dc.subjectpredationen_US
dc.titleThe risk assessment capability and defense induction strategy of the Eastern Oyster Crassostrea virginicaen_US
dc.typeTexten_US
thesis.degree.disciplineCoastal and Marine System Scienceen_US
thesis.degree.grantorTexas A & M University--Corpus Christien_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Scienceen_US
dc.contributor.committeeMemberSmith-Engle, Jennifer
dc.contributor.committeeMemberMclaughlin, Richard
dc.description.departmentLife Sciencesen_US
dc.description.collegeCollege of Science and Engineeringen_US
dc.type.genreThesisen_US


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