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dc.contributor.advisor Crowder, Larry en_US
dc.contributor.author Neely, Karen Lynn en_US
dc.date.accessioned 2008-08-29T06:47:54Z
dc.date.available 2008-08-29T06:47:54Z
dc.date.issued 2008-06-23 en_US
dc.identifier.uri http://hdl.handle.net/10161/820
dc.description Dissertation en_US
dc.description.abstract <p>Coral reef fish coexist in a state of high diversity that has not been successfully explained by niche diversification, larval supply, differential mortality, or a suite of other proposed factors. These processes are all occurring on a diverse substrate that would be expected to affect the abundance and distribution of fish by directing habitat preferences as well as affecting competitive and predatory success. I conducted correlational studies on healthy and degraded Caribbean reefs that addressed fish abundances at the levels of community, species, and age class. I also experimentally tested habitat preferences in two ways: choice experiments on adults of common species that determined preferences for live coral and rugosity in an isolated environment, and monitoring of artificial reefs differing in live coral cover that tested habitat selection of adults and juveniles in the field. These observations all show that live coral had no effect on community parameters such as abundance or diversity, but that rugosity was positively related to species richness. However, these measures of the community masked differences at the species and age class level. A handful of species exhibited positive or negative preferences for live coral, but these selections did not follow a taxonomic or trophic-level classification. Species within the genus Stegastes, for example, could either aggregate towards or avoid live coral. One species even reversed its habitat preference as it matured. Field distributions were not determined solely by these habitat preferences, but inclusion of competitive interactions into a multi-factorial model explained distribution of some species. Results suggest that changes in live coral cover, an increasingly common phenomenon, would not affect fish at a community level, but could affect a few species through changes to recruitment or alteration of competitive interactions.</p> en_US
dc.format.extent 2201680 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.subject Biology, Ecology en_US
dc.subject coral reefs en_US
dc.subject fish en_US
dc.subject behavior en_US
dc.subject habitat selection en_US
dc.title Influence of Substrate on Coral Reef Fish Communities en_US
dc.type Dissertation en_US
dc.department Ecology en_US

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