Henriksen, P. National Environmental Research Institute, pet@dmu.dk
Riemann, B. National Environmental Research Institute, bri@dmu.dk
S°rensen, H. M. Aarhus County,

 
QUANTIFYING PHYTOPLANKTON FROM PIGMENT ALGORITHMS - EVIDENCE FROM CULTURES AND NATURAL POPULATIONS
 
Pigment profiles of natural phytoplankton samples are used to detect and distinguish between various taxonomic units. The extent to which such finger prints can be used to quantify phytoplankton groups depends on the accuracy of the algorithms which is a function of the stability of the ratios between the marker pigments and chlorophyll a. We examined the stability of the algorithms in algal cultures grown under a variety of nutrient and light conditions. The ratios of chlorophyll a to 19┤-butanoyloxyfucoxanthin, 19┤hexanoyloxyfucoxanthin, fucoxanthin, peridinin and alloxanthin were examined. Results from laboratory cultures demonstrated that the ratio of chlorophyll a/alloxanthin in the cryptophyte Rhodomonas marina varied up to a factor 9 depending on light and nutrients, whereas the other marker pigments were much more stable to chlorophyll a. These results were compared to the stability of the marker pigments to chlorophyll a in a large number of other species and in natural populations using results from microscopic examinations as a reference.
 
Day: Thursday, Feb. 4
Time: 04:00 - 04:15pm
Location: Sweeney Center
 
Code: SS36TH0400S