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Author
Mock, T.
Title
In situ
primary production in young Antarctic sea ice
Type
Journal Article
Year
2002
Publication
Hydrobiologia
Abbreviated Journal
Hydrobiologia
Volume
470
Issue
1-3
Pages
127-132
Keywords
Sea ice; Marine ecosystems; Primary production; Algae; Epontic organisms; Light effects; Epontic environment; Temperature effects; Brines; Salinity effects; Carbon fixation; Antarctica; Weddell Sea; Psw; Ice; In-situ; 14c; Methods
Abstract
An
in situ
incubation technique used successfully to measure the photosynthetic carbon assimilation of internal algal assemblages within thick multiyear Arctic ice was developed and improved to measure the photosynthetic carbon assimilation within young sea ice only 50 cm thick (Eastern Weddell Sea, Antarctica). The light transmission was improved by the construction of a cylindrical frame instead of using a transparent acrylic-glass barrel. The new device enabled some of the first precise measurements of
in situ
photosynthetic carbon assimilation in newly formed Antarctic sea ice, which is an important component in the sea ice ecosystem of the Antarctic Ocean. The rates of carbon assimilation of the interior algal assemblage (top to 5 cm from bottom) was 0.25 mg C m?² d?¹ whereas the bottom algal community (lowest 5 cm) attained only 0.02 mg C m?² d?¹. Chl a specific production rates (P
Chl
) for bottom algae (0.020 – 0.056 µg C µg chl a?¹ h?¹) revealed strong light limitation, whereas the interior algae (P
Chl
= 0.7 – 1.2 µg C µg chl a?¹ h?¹) were probably more limited by low temperatures (< -5 degree C) and high brine salinities.
Address
Corporate Author
Thesis
Publisher
Kluwer Academic Publishers
Place of Publication
Dordrecht
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
0018-8158
ISBN
Medium
Area
Expedition
Conference
Notes
Freshwater; Brackish; Marine
Approved
no
Call Number
refbase @ admin @ Mock2002Hydrobiologia
Serial
802
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