Autecology and phylogeny of Coolia tropicalis and Coolia malayensis (Dinophyceae), with emphasis on taxonomy of C. tropicalis based on light microscopy, scanning electron microscopy and LSU rDNA1

Ejria Saleh, and Normawaty Mohamad Noor, and Øjvind Moestrup, and Lundholm, Nina and Fraga, Santiago and Aimimualiani Adam, and Holmes, Michael J. (2013) Autecology and phylogeny of Coolia tropicalis and Coolia malayensis (Dinophyceae), with emphasis on taxonomy of C. tropicalis based on light microscopy, scanning electron microscopy and LSU rDNA1. Journal of Phycology, 49 (3). pp. 536-545. ISSN 1529-8817

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Official URL: http://dx.doi.org/10.1111/jpy.12062

Abstract

Coolia is a widespread and ecologically important genus of benthic marine dinoflagellates found in tropical regions. Historically, there has been taxonomic confusion about the taxonomy and toxicity of this group. The goal of this study was to resolve morphological questions concerning Coolia tropicalis and determine the taxonomic identity of the Australian Coolia isolate which has been reported to produce cooliatoxins. To accomplish this, the morphology of tropical strains from Belize (the type locality of C. tropicalis), Malaysia, Indonesia, and Australia were examined and compared to published reports. The morphological analysis showed that C. tropicalis differs from the original description in that it has a slightly larger size (35–47 μm long by 30–45 μm wide versus 23–40 μm long by 25–39 μm wide), and the shape of fourth apical plate, and the length of Po plate (7.4–12 μm versus 7 μm). Based on both morphology and phylogenetic analysis using LSU D1- D3 rDNA sequences, the clones of C. tropicalis from Malaysia, Indonesia, and Belize were found to form a monophyletic clade within the genus. The strain producing cooliatoxin was found to be C. tropicalis, not Coolia monotis as originally assumed. To explore the factors influencing the growth of Coolia species, the growth rates of C. tropicalis and Coolia malayensis were determined at different temperatures and salinities. Both species tolerated a wide range of temperatures, but cannot survive at temperatures <20°C or >35°C. C. monotis, the dominant species reported in the literature, probably does not produce toxins.

Item Type:Article
Uncontrolled Keywords:Coolia malayensis, Coolia tropicalis, growth study, salinity, taxonomy, temperature
Subjects:Q Science > QK Botany
Divisions:SCHOOL > Borneo Marine Research Institute
ID Code:1762
Deposited By:IR Admin
Deposited On:05 Feb 2016 15:18
Last Modified:05 Feb 2016 15:18

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