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dc.contributor.advisorGrange, Ken
dc.contributor.advisorStewart, Brian
dc.contributor.authorDuncan, Joanne Claireen_NZ
dc.date.available2012-12-14T04:40:32Z
dc.date.copyright1998en_NZ
dc.identifier.citationDuncan, J. C. (1998). Biology of the sea pen Pteroeides sp. in Fiordland, New Zealand (Thesis, Master of Science). University of Otago. Retrieved from http://hdl.handle.net/10523/2937en
dc.identifier.urihttp://hdl.handle.net/10523/2937
dc.description281 leaves ; 30 cm. Includes bibliography. "August 1998". University of Otago department: Marine Science.en_NZ
dc.description.abstractThe sea pen Pteroeides sp. shows variability in size frequency distributions and density between areas of a population, suggestive of spatially unpredictable and patchy recruitment. The spatial distribution of colonies does not differ significantly from a random distribution. The calcareous axial style contains growth rings, though it was not established whether rings are annual. Colonies are able to successfully reanchor within the substratum following diver removal, but exposure of colonies may increase chances of possible predatory damage. Movement of colonies across the substratum occurs, but is not significant over the population as a whole. The nudibranch Tritonia sp. is identified as the only known predator of Pteroeides sp. in New Zealand fiords to date. Ten to twenty percent of Pteroeides sp. colonies in the study area contain an endosymbiotic filamentous brown alga. Pteroeides sp. is gonochoric with a sex ratio of 1:1. Gametogenesis is synchronous among all polyps in a colony. Both sexes show the same annual pattern of gamete maturity with an annual spawning event. The presense of immature oocytes throughout the year indicates oogenesis may take more than one year to complete. Mature oocytes are large (c. 500-550μm in diameter) and broadcast spawning occurs in late summer.
dc.format.mimetypeapplication/pdf
dc.language.isoenen_NZ
dc.publisherUniversity of Otagoen_NZ
dc.rightsAll items in OUR Archive are provided for private study and research purposes and are protected by copyright with all rights reserved unless otherwise indicated.en_NZ
dc.titleBiology of the sea pen Pteroeides sp. in Fiordland, New Zealanden_NZ
dc.typeThesisen_NZ
thesis.degree.disciplineMarine Scienceen_NZ
thesis.degree.nameMaster of Scienceen_NZ
thesis.degree.grantorUniversity of Otagoen_NZ
thesis.degree.levelMastersen_NZ
otago.interloanyesen_NZ
otago.openaccessOpen
dc.identifier.voyager245537en_NZ
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