Accessible Requires Authentication Published by De Gruyter July 24, 2013

The genus Pseudo-nitzschia (Bacillariophyceae) in Malaysia, including new records and a key to species inferred from morphology-based phylogeny

Sing Tung Teng, Chui Pin Leaw, Hong Chang Lim and Po Teen Lim
From the journal Botanica Marina

Abstract

Species of the diatom Pseudo-nitzschia are known to produce domoic acid that is responsible for amnesic shellfish poisoning (ASP). To investigate the potential risk of ASP and species occurrence of toxic or potentially toxic Pseudo-nitzschia in Malaysian waters, plankton samples were collected from 17 locations. Samples were examined through transmission electron microscopy. Species of Pseudo-nitzschia were identified on the basis of the frustule morphology and morphometric measurements. Twenty-two well-described species were recorded, of which 14 are new records for Malaysia. A new morphotype, closely resembling species in the pseudodelicatissima complex, was also discovered. The morphotype differs from other species in the complex by its lower densities of fibulae and striae. Nine of the species have previously been associated with ASP events worldwide. Our study recorded for the first time high species richness of Pseudo-nitzschia in the confined coasts of Malaysia. In addition, we performed a morphology-based phylogeny and proposed a key to Pseudo-nitzschia species, with a special emphasis on the poroid structure of the striae, to aid in species identification.


Corresponding author: Po Teen Lim, Faculty of Resource Science and Technology, Universiti Malaysia Sarawak, Kota Samarahan, 94300 Sarawak, Malaysia

The authors are grateful to the anonymous reviewers for their constructive comments. Special thanks to Stephen S. Bates for valuable suggestions and English revision of the manuscript. S.T. Teng was partially supported by UNIMAS postgraduate fellowship. This study was funded by the Malaysian Government through MOSTI ScienceFund (02-01-09-SF0054) to C.P. Leaw, ScienceFund (04-01-02-SF0092), and MoHE JSPS-Asian Core Program to P.T. Lim.

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Received: 2012-8-13
Accepted: 2013-6-29
Published Online: 2013-07-24
Published in Print: 2013-08-01

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