A preliminary study of Gelidium capense in culture

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dc.contributor.advisorBolton, John Jen_ZA
dc.contributor.authorBentley, Joanneen_ZA
dc.date.accessioned2017-08-08T06:49:02Z
dc.date.available2017-08-08T06:49:02Z
dc.date.issued2010en_ZA
dc.description.abstractSome preliminary investigations of the effects of temperature, light intensity, salinity and to a lesser extent, water movement, were performed under controlled laboratory culture conditions on the subtidal red alga Gelidium capense, with regards to its potential for aquaculture for its use in the agar and paper-making industries. Agar was also extracted from a wild population and its concentration measured. Four temperature conditions {l0°C, 15°C, 20°c and 25°C) and three salinities (35ppt, 18ppt and 9ppt) were tested as well as four irradiances (120-140 μmol photons m⁻²s⁻¹ , 80-100 μmol photons m⁻²s⁻¹, 60-70 μmol photons m⁻²s⁻¹ and 30-50 μmol photons m⁻²s⁻¹). Water movement was achieved either through aeration or using a flask shaker. A combination of full salinity {35ppt) and 15°C temperature with a light intensity of 80- 100 μmol photons m⁻²s⁻¹ yielded the most optimal growth rates (5 .07% day⁻¹) while poor growth rates (- 1.61% day⁻¹) were observed for the 18ppt and 9ppt salinities and the lowest light intensities. Interestingly, G. capense did not thrive at 20°c or 25°C and instead discoloured rapidly, showed necrosis within a few days, which is in contrast to the findings of most studies focussed on other species of Gelidium under similar conditions. Slow growth rates were achieved at 10°c. The mean agar yield measured ten percent (9.66% ± 1.81) of dry algal weight which is less than a third of the agar yields of some other species of Gelidium and Graci/aria. This suggests that this species may not be as valuable as other Gelidium species in terms of its agar content. It does, however, have high rhizine content and this may lend it to be beneficial in the papermaking industry.en_ZA
dc.identifier.apacitationBentley, J. (2010). <i>A preliminary study of Gelidium capense in culture</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Biological Sciences. Retrieved from http://hdl.handle.net/11427/24853en_ZA
dc.identifier.chicagocitationBentley, Joanne. <i>"A preliminary study of Gelidium capense in culture."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 2010. http://hdl.handle.net/11427/24853en_ZA
dc.identifier.citationBentley, J. 2010. A preliminary study of Gelidium capense in culture. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Bentley, Joanne AB - Some preliminary investigations of the effects of temperature, light intensity, salinity and to a lesser extent, water movement, were performed under controlled laboratory culture conditions on the subtidal red alga Gelidium capense, with regards to its potential for aquaculture for its use in the agar and paper-making industries. Agar was also extracted from a wild population and its concentration measured. Four temperature conditions {l0°C, 15°C, 20°c and 25°C) and three salinities (35ppt, 18ppt and 9ppt) were tested as well as four irradiances (120-140 μmol photons m⁻²s⁻¹ , 80-100 μmol photons m⁻²s⁻¹, 60-70 μmol photons m⁻²s⁻¹ and 30-50 μmol photons m⁻²s⁻¹). Water movement was achieved either through aeration or using a flask shaker. A combination of full salinity {35ppt) and 15°C temperature with a light intensity of 80- 100 μmol photons m⁻²s⁻¹ yielded the most optimal growth rates (5 .07% day⁻¹) while poor growth rates (- 1.61% day⁻¹) were observed for the 18ppt and 9ppt salinities and the lowest light intensities. Interestingly, G. capense did not thrive at 20°c or 25°C and instead discoloured rapidly, showed necrosis within a few days, which is in contrast to the findings of most studies focussed on other species of Gelidium under similar conditions. Slow growth rates were achieved at 10°c. The mean agar yield measured ten percent (9.66% ± 1.81) of dry algal weight which is less than a third of the agar yields of some other species of Gelidium and Graci/aria. This suggests that this species may not be as valuable as other Gelidium species in terms of its agar content. It does, however, have high rhizine content and this may lend it to be beneficial in the papermaking industry. DA - 2010 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2010 T1 - A preliminary study of Gelidium capense in culture TI - A preliminary study of Gelidium capense in culture UR - http://hdl.handle.net/11427/24853 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/24853
dc.identifier.vancouvercitationBentley J. A preliminary study of Gelidium capense in culture. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 2010 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/24853en_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.subject.otherPhycologyen_ZA
dc.titleA preliminary study of Gelidium capense in cultureen_ZA
dc.typeBachelor Thesis
dc.type.qualificationlevelHonours
dc.type.qualificationnameBSc (Hons.)en_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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