NDLI: Detecting the bloom-forming dinoflagellate Alexandrium tamarense using the absorption signature

Content Provider	Springer Nature Link
Author	Leong, Sandric Chee Yew Taguchi, Satoru
Copyright Year	2006
Abstract	Pulsed N inputs were simulated by exposing Alexandrium tamarense to sudden increase in concentration of three different N sources to evaluate an approach of using absorption coefficient (a ph) ratio at three wavelengths to detect toxic dinoflagellates such as A. tamarense. The present study examined the absorption properties of A. tamarense for a range of concentrations under three different nitrogen sources and concluded that using absorption such as chlorophyll-specific absorption coefficient (a ph * ) at a single wavelength is not appropriate for detecting bloom forming species due to variability of a ph * caused by varying physiological states. With appropriate wavelengths established, the a ph ratio approach with three wavelengths has the capability of detecting A. tamarense. Variable environmental conditions such as nutrient species, light quantity and light quality did not affect the a ph ratios significantly, particularly the ratio at 510 and 675 relative to 555 nm. This ratio allows differentiation of A. tamarense from other phytoplankton species including other bloom-forming dinoflagellates. In addition, this ratio could also detect the presence of A. tamarense in mixed cultures from diluted samples of as low as 5% in cell abundance (c. 30% in Chl a concentration). The present study suggests that this ratio could be an adequate biomarker for dinoflagellates such as A. tamarense. This absorption ratio technique could provide means of interpreting field populations and enhancing the capability for detecting harmful species such as A. tamarense.
Starting Page	299
Ending Page	308
Page Count	10
File Format	PDF
ISSN	00188158
Journal	Hydrobiologia
Volume Number	568
Issue Number	1
e-ISSN	15735117
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-05-29
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	absorption ratio ammonium harmful algal blooms nitrate urea Ecology Hydrobiology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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