Towards a Movement Ecology: Modeling the Behavioral Response of Invasive Snails to Resources and Competition.

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dc.contributor.advisor Nick M. Haddad, Committee Member en_US
dc.contributor.advisor James F. Gilliam, Committee Chair en_US
dc.contributor.advisor Jay F. Levine, Committee Member en_US
dc.contributor.advisor Kevin Gross, Committee Member en_US Snider, Sunny Brooke en_US 2010-04-02T19:10:25Z 2010-04-02T19:10:25Z 2008-03-03 en_US
dc.identifier.other etd-11052007-171057 en_US
dc.description.abstract The movement of individuals is one of the fundamental components of contemporary ecological problems such as metapopulation theory, epidemic models, competitive coexistence, and invasion dynamics. Advection-diffusion models, sometimes with a reaction term, have been usefully applied to such problems. For this dissertation, I broadened this approach by seeking to understand the effects of certain biotic and abiotic factors on movement ecology, and asking how to incorporate flexible behavioral responses into classical advection-diffusion models. I asked how resources, competitive environment, and habitat structure, interacting with body size or not, affect the movement behaviors of two coexisting invasive snails (Melanoides tuberculata and Tarebia granifera), and whether including the behavioral response to these factors improves advection-diffusion models of movement. I also made natural history observations regarding the snail system to provide a biological context for my empirical work. To address these questions, I conducted replicated experiments and observational studies, extended advection-diffusion models, and arbitrated among candidate models using AIC (Akaike's Information Criterion) model selection. Specific studies included (1) behavioral response to phenotypic and resource heterogeneities, and their interaction, (2) behavioral response to intraspecific and interspecific competition, and (3) behavioral response to spatially uniform versus spatially heterogeneous environments. In summary, this dissertation provides insights into modeling movement behaviors, using two coexisting invasive snails as the model system. I advocate for a behaviorally informed modeling framework that integrates sentient responses of individuals in terms of movement, improving our ability to accurately model ecological processes that depend on movement ecology. en_US
dc.rights I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dis sertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. en_US
dc.subject Tarebia granifera en_US
dc.subject Melanoides tuberculata en_US
dc.subject resources en_US
dc.subject Trinidad en_US
dc.subject snail en_US
dc.subject invasion speed en_US
dc.subject heterogeneity en_US
dc.subject movement ecology en_US
dc.subject movement en_US
dc.subject competition en_US
dc.subject invasion en_US
dc.subject body size en_US
dc.subject habitat boundaries en_US
dc.subject diffusion en_US
dc.subject advection en_US
dc.subject behavior en_US
dc.title Towards a Movement Ecology: Modeling the Behavioral Response of Invasive Snails to Resources and Competition. en_US PhD en_US dissertation en_US Zoology en_US

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