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Marine Biology

, Volume 151, Issue 1, pp 99–107 | Cite as

Photosynthesis in Codium fragile (Chlorophyta) from a Nova Scotia estuary: responses to desiccation and hyposalinity

  • Kwang Young Kim
  • David J. Garbary
Research Article

Abstract

Codium fragile ssp. tomentosoides from Caribou Harbour, an estuarine site in the southern Gulf of St. Lawrence, was extremely tolerant to stresses from desiccation and reduced salinity. Photosynthetic responses of both rhizomatous and erect growth forms were measured using pulse amplitude modulation (PAM) fluorometry of chlorophyll a fluorescence to determine effective quantum yield (ΦPSII) and relative electron transport rate (rETR). After 5 h of desiccation, thalli lost 20% of their mass, but still showed high levels of ΦPSII. Thalli survived for at least 6 h in freshwater, and showed virtually complete recovery of photosynthetic capacity within a few hours of return to full seawater. Immersion in 8 psu showed virtually complete recovery until the 24 h treatment period. Combining desiccation and salinity stresses produced a synergistic effect, but plants still showed strong recovery even after 86% dehydration and reimmersion in 16 psu. These results suggest that the photosynthetic physiology of Codium fragile is highly adapted to growth in estuarine conditions.

Keywords

Photosynthetically Active Radiation Effective Quantum Yield Relative Electron Transport Rate Rapid Light Curf Intertidal Alga 
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.

Notes

Acknowledgments

We thank Sarah Fraser for technical support and AG Miller and Ricardo Scrosati for helpful discussion and comments on the manuscript. This work was supported by grants from MarineBio21, Ministry of Maritime Affairs and Fisheries, Korea to KYK and the Natural Sciences and Engineering Research Council of Canada to DJG.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Department of OceanographyChonnam National UniversityGwangjuSouth Korea
  2. 2.Department of BiologySt. Francis Xavier UniversityAntigonishCanada

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