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Marine Biology

, Volume 70, Issue 2, pp 197–204 | Cite as

Calcification in the maerl coralline alga Phymatolithon calcareum: Effects of salinity and temperature

  • R. J. King
  • W. Schramm
Article

Abstract

The coralline alga Phymatolithon calcareum was dredged from 13 m in the Kattegatt, Baltic Sea, in December, 1980, and its rate of calcification was measured by 45Ca++-uptake methods. Light-saturated calcification rates at 5°C ranged from 15.8 μg CaCO3 g-1 dry wt h-1 for the basal parts of the plants to 38.7 μg CaCO3 g-1 dry wt h-1 for the tips. These “age” gradients were not apparent when calcification rates were expressed on the basis of surface area. Experiments with salinity (10, 20, 30‰) and temperature (0°, 5°, 10°, 20°C) indicated that optimum conditions for calcification were at 30‰ S and at temperatures above 10°C. Salinity had a greater influence on calcification rate than did temperature, and there was a positive relationship between salinity and calcification rate at all temperatures. In 6 mo old cultures, salinity was again the important factor, with all plants remaining healthy at 30‰ except those at the highest temperature (20°C). These trends, and the low calcification rates at 10‰S (4.6 μg CaCO3 g-1 dry wt h-1 at 5°C to 8.6 μg CaCO3g-1 dry wt h-1 at 20°C) suggest that low salinity may be the explanation for the general absence of P. calcareum from the brackish waters of the Baltic Sea. Short-term experiments in which salinity was kept constant while Ca++ concentration was altered, and experiments in which salinity was varied and Ca++ concentration kept constant, suggest that it is the calcium ion concentration and not salinity per se which affects calcification rates.

Keywords

Calcium Optimum Condition Positive Relationship CaCO3 Great Influence 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1982

Authors and Affiliations

  • R. J. King
    • 1
  • W. Schramm
    • 2
  1. 1.School of BotanyThe University of New South WalesKensingtonAustralia
  2. 2.Institut für Meereskunde an der Universität KielKiel 1Germany

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