Oceans and Ice Branch–Code 971, NASA/Goddard Space Flight Center, Greenbelt, Maryland 20771.
THE INFLUENCE OF SALINITY AND TEMPERATURE COVARIATION ON THE PHOTOPHYSIOLOGICAL CHARACTERISTICS OF ANTARCTIC SEA ICE MICROALGAE1
Article first published online: 26 OCT 2004
Journal of Phycology
Volume 28, Issue 6, pages 746–756, December 1992
How to Cite
Arrigo, K. R. and Sullivan, C. W. (1992), THE INFLUENCE OF SALINITY AND TEMPERATURE COVARIATION ON THE PHOTOPHYSIOLOGICAL CHARACTERISTICS OF ANTARCTIC SEA ICE MICROALGAE. Journal of Phycology, 28: 746–756. doi: 10.1111/j.0022-3646.1992.00746.x
Received 16 March 1992. Accepted 6 August 1992.
We thank D. Robinson, G. Dieckmann, M. Gosselin, and R. Reynolds for their assistance in the field and in the construction of the photosynthetron. We also thank D. Stramski, for the use of his spectrophotometer and his help in obtaining particulate absorption spectra, and B. Jones, who analyzed our nutrient samples. We extend special thanks to S. Kottmeier, International Telephone and Telegraph, and Antarctic Support Associates for their logistical support while in McMurdo Sound. We are especially grateful to C. Lembi and two anonymous reviewers for their timely and helpful comments. This work was supported by NSF grants DPP-817237 and DPP-8717692 from the Division of Polar Programs.
- Issue published online: 26 OCT 2004
- Article first published online: 26 OCT 2004
- photosynthetic efficiency;
- photosynthetic rate;
- quantum yield;
- salinity adaptation;
- sea ice;
- temperature adaptation
The responses of sea ice microalgae to variation in ambient irradiance (0 to 150 μE · m−2· s−1), temperature (–6° to + 6° C), and salinity (0 to 100 ppt) were tested to determine whether these variables act independently or in concert to influence rates of microalgal photosynthesis. The photosynthetic efficiency and maximum photosynthetic rate for sea ice microalgae increased as a function of incubation temperature between -6° and + 6° C. Furthermore, photosynthetic efficiency, maximum photosynthetic rate, and quantum yield were greatest at salinities between SO and 50 ppt. In contrast, the mean specific absorption coefficients were lowest near seawater salinities, and the saturating irradiance, Is, appeared to be inversely proportional to salinity. Results also suggest that the effects of salinity on the growth of sea ice microalgae are independent of those elicited by temperature or light, and that the functional relationship between salinity and light or temperature is multiplicative. This information is essential to the proper formulation of algorithms used to describe algal growth in environments where light, temperature, and salinity are changing simultaneously, such as within sea ice or within the water column at the marginal ice edge zone.