Vinsamlegast notið þetta auðkenni þegar þið vitnið til verksins eða tengið í það: http://hdl.handle.net/1946/15826
Pyrodinium bahamense, a toxic dinoflagellate, is the leading cause of “red tide” algal blooms in the Philippines. Current monitoring practices do not address the need for an early warning system, due to the high costs and expertise required in the implementation of available methods. The feasibility of an inexpensive and simple method for monitoring HABs was examined. The approach was based on analysis of colour, derived from in situ digital images, supplemented by basic environmental measurements – salinity, temperature, and light intensity. The influence of these parameters on growth - and thus the ability to predict a bloom - was explored, alongside the notion that P. bahamense should alter the colour balance of a water body, indicating the initiation of a bloom. Colour was analyzed in respect to the three basic components of a digital image: Red, green, and blue. Three bodies of water and three rivers surrounding the island of Palawan, Philippines were examined. The colour balance was consistent in most cases, and a unique colour composition was found for each location. Light intensity readings were always within the optimal growth range for P. bahamense, and the same is true for salinity with one exception. Temperature was too high 36% of the time, but 34% of these results exceeded the optimal range by only 1°Ce, and samples were taken at the surface. Thus, the environmental parameters examined seemed consistently within the optimal range for P. bahamense growth. In situ optical monitoring results were encouraging, but inconclusive due to the lack of a P. bahamense bloom occurrence during study.