Effects of Environmental Factors on Distribution and Asexual Reproduction of the Invasive Hydrozoan, Moerisia lyonsi

dc.contributor.advisorKennedy, Victor Sen_US
dc.contributor.advisorMiller, Thomas Jen_US
dc.contributor.advisorPurcell, Jennifer Een_US
dc.contributor.authorMa, Xipingen_US
dc.contributor.departmentMarine-Estuarine-Environmental Sciencesen_US
dc.date.accessioned2004-05-31T19:47:48Z
dc.date.available2004-05-31T19:47:48Z
dc.date.issued2003-12-10en_US
dc.description.abstractThe effects of temperature, salinity, food and predation on the invasive hydrozoan, Moerisia lyonsi, were studied in the laboratory to understand its cross-oceanic distribution patterns and the quantitative relationships between the asexual reproduction of polyp and medusa buds. Polyp mortality occurred only at some treatments of salinities 35-40. Polyps reproduced asexually at salinities 1-40 at 20-29°C, but not at 10°C. The highest asexual reproduction rates occurred at salinities 5-20 without significant difference among salinities. The scyphomedusa, Chrysaora quinquecirrha, was found to prey heavily on the medusae of M. lyonsi and may have restricted its distributions in estuaries. The initiation and proportion of medusa bud production was more responsive to environmental changes than that of polyp bud production. Unfavorable conditions enhanced polyp bud production, while favorable conditions enhanced medusa bud production. The adaptive reproduction processes of M. lyonsi and the significance to survival and dispersal of the populations are discussed.en_US
dc.format.extent509206 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/1903/99
dc.language.isoen_US
dc.relation.isAvailableAtDigital Repository at the University of Marylanden_US
dc.relation.isAvailableAtUniversity of Maryland (College Park, Md.)en_US
dc.subject.pqcontrolledBiology, Oceanographyen_US
dc.titleEffects of Environmental Factors on Distribution and Asexual Reproduction of the Invasive Hydrozoan, Moerisia lyonsien_US
dc.typeThesisen_US

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