A Preliminary Report on the Photosynthetic Activity of Phyllophora Antarctica A. et E. S. GEPP, Antarctic Red Alga

Antarctic red alga, Phyllophora antarctica A. et E. S. GEPP was collected from beneath the ice on the coast of East Ongul Island (Lat. 69°00'S, Long. 39°35'E) situated in Lutzow-Holm Bay, Antarctica. The water temperature was -0.5℃. The light intensity was 650lx. The measurement of photosy...

Full description

Bibliographic Details
Main Author: Masao OHNO
Format: Article in Journal/Newspaper
Language:English
Published: National Institute of Polar Research 1976
Subjects:
geo
Online Access:https://doi.org/10.15094/00007888
https://doaj.org/article/67ba837be0534391909d1595ec34619d
Description
Summary:Antarctic red alga, Phyllophora antarctica A. et E. S. GEPP was collected from beneath the ice on the coast of East Ongul Island (Lat. 69°00'S, Long. 39°35'E) situated in Lutzow-Holm Bay, Antarctica. The water temperature was -0.5℃. The light intensity was 650lx. The measurement of photosynthetic activity on the specimens was made in the laboratory aboard the ice breaker FUJI. The fronds were placed in D. O. bottles for one hour. Net photosynthesis was measured by means of Winkler titration for dissolved O_2 before and after the incubation. The photosynthetic activity increased with increase in light intensity till 8,000lx. The optimum temperature for the photosynthetic activity was about 20℃ under 8,000lx. But the fronds kept under 15℃ or 20℃ for 3 days discolored and showed low rates of the activity.