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An evaluation of the application of CHEMTAX to Antarctic coastal pigment data |
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| Authors: | Wendy A Kozlowski Douglas Deutschman |
| Institution: | a Integrative Oceanography Division, Scripps Institution of Oceanography, Mail Code 0218, La Jolla, CA 92093-0218, USA b Department of Biology, San Diego State University, 5500 Campanile Drive, San Diego, CA 92182, USA c Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales, C.C. 330, 5500 Mendoza, Argentina d NATO Undersea Research Center, La Spezia, Italy |
| Abstract: | Presented is an evaluation of the application of CHEMTAX (CHEMical TAXonomy) to Antarctic coastal pigments collected along the western Antarctic Peninsula (wAP). Overall analytical error is <20% for all pigments involved in the analysis. CHEMTAX was stable within a range of input pigment ratios; data were analyzed in three bins based on light depths, with each year's data run independently. Results were validated by comparison to those from CHEMTAX methods that included randomized error, feedback loops and additional diagnostic pigments. Blooms during mid-summer (chlorophyll a concentrations >5 ??g L−1) were dominated primarily by either diatoms or cryptomonads. Mixed flagellates can also be abundant and Pheaocystis spp. and prasinophytes are frequently present in low concentrations. Comparison with microscopy shows CHEMTAX to give superior results in identifying Pheaocystis spp. with favorable results for other groups. This analysis shows CHEMTAX to be a reliable and stable tool for providing estimations of the main phytoplankton taxa in wAP waters based on long-term data collected during a 12-year time series. |
| Keywords: | Phytoplankton Antarctica Pigments CHEMTAX Microscopy |
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