Nitrogen environment, ecophysiology and growth of Gracilaria gracilus in Saldanha Bay, South Africa

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dc.contributor.advisorBolton, John Jen_ZA
dc.contributor.advisorAnderson, Robert Jen_ZA
dc.contributor.authorSmit, Albertus Jacobusen_ZA
dc.date.accessioned2016-02-29T12:06:00Z
dc.date.available2016-02-29T12:06:00Z
dc.date.issued1998en_ZA
dc.descriptionBibliography: pages 132-157.en_ZA
dc.description.abstractThe growth of Gracilaria gracilis (Stackhouse) Steentoft, Irvine et Farnham was examined by studying the effect of organismic determinants such as thallus length, position along the thallus and branching in a series of in situ and laboratory-based experiments. Knowledge of these factors is essential in order to maximise production from suspended seaweed rafts seeded with vegetative G. gracilis fragments. Seeding netlons with freshly collected material provided up to 30 % higher relative growth rates than seaweed maintained on the netlons for three successive months. Initial seedstock length greatly affected growth rate and yield such that 30 cm thalli fragments resulted in growth rates 14 % higher than for 10 cm fragments. This difference is suggested to be due to higher contribution of growth by lateral branches to overall biomass. Comparisons of the growth of apical and basal fragments suggested that growth takes place over the entire length of the thallus but that the apex contributes more to overall elongation than does the proximal part. The removal of apical meristems resulted in an enhanced branching frequency with production of four times as many branches as intact fragments. Evidence is also provided for severe morphological differentiation following long periods of rapid growth. These thalli have very high frequency of branching, are hollow due to the disintegration of medullary cells and are considered to be completely senescent.en_ZA
dc.identifier.apacitationSmit, A. J. (1998). <i>Nitrogen environment, ecophysiology and growth of Gracilaria gracilus in Saldanha Bay, South Africa</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Biological Sciences. Retrieved from http://hdl.handle.net/11427/17362en_ZA
dc.identifier.chicagocitationSmit, Albertus Jacobus. <i>"Nitrogen environment, ecophysiology and growth of Gracilaria gracilus in Saldanha Bay, South Africa."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1998. http://hdl.handle.net/11427/17362en_ZA
dc.identifier.citationSmit, A. 1998. Nitrogen environment, ecophysiology and growth of Gracilaria gracilus in Saldanha Bay, South Africa. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Smit, Albertus Jacobus AB - The growth of Gracilaria gracilis (Stackhouse) Steentoft, Irvine et Farnham was examined by studying the effect of organismic determinants such as thallus length, position along the thallus and branching in a series of in situ and laboratory-based experiments. Knowledge of these factors is essential in order to maximise production from suspended seaweed rafts seeded with vegetative G. gracilis fragments. Seeding netlons with freshly collected material provided up to 30 % higher relative growth rates than seaweed maintained on the netlons for three successive months. Initial seedstock length greatly affected growth rate and yield such that 30 cm thalli fragments resulted in growth rates 14 % higher than for 10 cm fragments. This difference is suggested to be due to higher contribution of growth by lateral branches to overall biomass. Comparisons of the growth of apical and basal fragments suggested that growth takes place over the entire length of the thallus but that the apex contributes more to overall elongation than does the proximal part. The removal of apical meristems resulted in an enhanced branching frequency with production of four times as many branches as intact fragments. Evidence is also provided for severe morphological differentiation following long periods of rapid growth. These thalli have very high frequency of branching, are hollow due to the disintegration of medullary cells and are considered to be completely senescent. DA - 1998 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1998 T1 - Nitrogen environment, ecophysiology and growth of Gracilaria gracilus in Saldanha Bay, South Africa TI - Nitrogen environment, ecophysiology and growth of Gracilaria gracilus in Saldanha Bay, South Africa UR - http://hdl.handle.net/11427/17362 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/17362
dc.identifier.vancouvercitationSmit AJ. Nitrogen environment, ecophysiology and growth of Gracilaria gracilus in Saldanha Bay, South Africa. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1998 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/17362en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Biological Sciencesen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherBotanyen_ZA
dc.titleNitrogen environment, ecophysiology and growth of Gracilaria gracilus in Saldanha Bay, South Africaen_ZA
dc.typeDoctoral Thesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhDen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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