
TY  - JOUR
A1  - Parker, RR 
A1  - Tranter, DJ 
T1  - Estimation of algal standing stock and growth parameters usin <I>in vivo</I> fluorescence
JF  - Marine and Freshwater Research
JO  - Mar. Freshwater Res.
Y1  - 1981
VL  - 32
IS  - 4
SP  - 629
EP  - 638
KW  - 
UR  - https://doi.org/10.1071/MF9810629 
N2  - This paper is addressed to the following questions: 'How accurately does in vivo chlorophyll fluorescence of samples treated with Diuron (DCMU), notated FM estimate autotrophic standing stock?' and 'How accurately does the Diuron response, &#916;F (= FM - FV), estimate primary production?'. Data are drawn from several cruises in the western Tasman Sea, ranging between latitudes 25ºS. and 53ºS. The prediction of chlorophyll (µg chl u I-1) from FM (standard chl a fluorescence units) is given by Chl= 2 &#215; 10-3 FM. The standard error is about 6 &#215; 10-4 FM so the 'true' value will usually be within ±60% of the estimated mean value. The production parameter, PA(µg Cl-1), as measured by 14C uptake under saturating light conditions, may be predicted for the euphotic zone other than the surface layer by PA = 3 &#215; 10-2&#916;F. If mean &#916;F values are used the 'true' value will usually lie within ±25% of the estimate. A strong diel effect was found in the parameter &#934;( =&#916;FFM-1), the 'photochemical quantum efficiency', an estimator of relative growth rate. The diel cycle has the form of a major midday minimum, a minor midnight minimum, and pre-dawn and post-sunset maxima. This cycle must be removed before comparisons of &#934; of samples taken at different times can be made. 
ER  -

