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Seasonal changes in the phytoplankton as indicated by chlorophyll estimations

Published online by Cambridge University Press:  11 May 2009

W. R. G. Atkins  and
Mary Parke
W. R. G. Atkins
Affiliation:
From the Plymouth Laboratory
Mary Parke
Affiliation:
From the Plymouth Laboratory
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Extract

The pigments of pure cultures of algae, of known number per volume, have been extracted with aqueous acetone after separation by filtration. The extracts were compared in a Kober colorimeter with standard solutions of a preparation of bought chlorophyll. The number required to give 1 mg. of chlorophyll was thus determined.

The algae studied included: Chlorophyceae, two species of Chlamydomonas and one Chlorella not yet described; Chrysophyceae, Dicrateria inornata Parke; Bacillariophyceae, Coscinodiscus centralis Ehr., Thalassiosira gravida Cleve and Nitzschia closterium (Ehr.) W.Sm. forma minutissima; Cryptophyceae, Hemiselmis rufescens Parke; Dinophyceae, Gymnodinium sp. The numbers per milligram of chlorophyll varied from 74 × 103 for Coscinodiscus to over 3200 × 106 for Hemiselmis rufescens. Of the nine cultures, six were between 50 and 750 × 106. The volume of the cell is the decisive factor in the milligram count.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 29 , Issue 3 , February 1951 , pp. 609 - 618
Copyright
Copyright © Marine Biological Association of the United Kingdom 1951

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