EFFECTS OF TEMPERATURE AND ILLUMINANCE ON CELL DIVISION RATES OF THREE SPECIES OF TROPICAL OCEANIC PHYTOPLANKTON(1).

Abstract:

:Three species of tropical oceanic phytoplankton were isolated from two locations in the eastern Pacific Ocean. Unialgal cultures were maintained in an enriched seawater medium. The effects of temperature, and, in separate experiments, illuminance, on the exponential cell division rates of those algae were investigated. For 2 isolates of Gymnoclinium sp. (probably G. simplex), maximum growth rates were 1.25 and 1.7 divisions/24 hr, the optimum temperature range was 23-29 C, the compensation illuminance was 35 ft-c, and the saturation illuminance was 750 ft-c and above. For a small species of Chaetoceros, the maximum growth rate was 6.0 divisions/24 hr, the optimum temperature range was 23-37 C, the compensation illuminance was 10 ft-c, and the saturation illuminance was 600 ft-c. For a small Nannochloris species, the maximum growth rate was 4.5 divisions/ 24 hr, the optimum temperature range was 27-37 C, and the saturation illuminance was 800 ft-c. Nannochloris grew heterotrophically by apparently utilizing organic matter supplied by soil extract.

journal_name

J Phycol

journal_title

Journal of phycology

authors

Thomas WH

doi

10.1111/j.1529-8817.1966.tb04586.x

subject

Has Abstract

pub_date

1966-03-01 00:00:00

pages

17-22

issue

1

eissn

0022-3646

issn

1529-8817

journal_volume

2

pub_type

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