Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/151879
Title: RAPHIDOPHYTE BLOOM POTENTIAL WITHIN SINGAPORE COASTAL WATERS
Authors: KOK WAI KIT, JEROME
Keywords: Raphidophytes, Harmful Algal Blooms, Physiology, Nutrients, Pigments, Chromophoric Dissolved Organic Matter
Issue Date: 16-Aug-2018
Citation: KOK WAI KIT, JEROME (2018-08-16). RAPHIDOPHYTE BLOOM POTENTIAL WITHIN SINGAPORE COASTAL WATERS. ScholarBank@NUS Repository.
Abstract: Raphidophytes are bloom-forming phytoplankton which have caused severe fish-kill events in many places around the world. Information about raphidophytes have largely derived from temperate studies, but their tropical dynamics are poorly understood. This thesis provided information about tropical raphidophytes using batch-culture experiments and field studies. In general, nitrogen-spiking triggered raphidophyte growth, with tropical species able to grow faster than their temperate counterparts. Warm tropical temperatures were incompatible with the cyst-driven bloom strategy of Heterosigma akashiwo, but cell recovery strategies could instead be important. Under field conditions, two raphidophyte blooms in Jan 2016 and Oct 2017 coincided with reduced diatom density, suggesting that such conditions may have a role in driving blooms. One possible selection factor may be salinity-reduction which can increase cellular exposure to harmful ultraviolet radiation. Tropical raphidophytes therefore have unique properties which are suited to tropical coastal conditions, and lead to an elevated bloom potential within these waters.
URI: http://scholarbank.nus.edu.sg/handle/10635/151879
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