PHOTOSYNTHESIS CHARACTERISTICS OF ICE ALGAE WITH SPECIAL EMPHASES ON TEMPERATURE AND LIGHT CONDITIONS (EXTENDED ABSTRACT)
Under the sea ice of polar oceans, temperature is restricted to the range- 1.8 to- 1.5OC and light is also limited to low intensities due to reflection and absorption by snow and ice. As temperature and light are both essential conditions for photosynthesis, ice algae are expected to be affected by...
| Main Authors: | , , |
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.575.6351 http://polaris.nipr.ac.jp/~penguin/polarbiosci/issues/pdf/1995-Suzuki.pdf |
| Summary: | Under the sea ice of polar oceans, temperature is restricted to the range- 1.8 to- 1.5OC and light is also limited to low intensities due to reflection and absorption by snow and ice. As temperature and light are both essential conditions for photosynthesis, ice algae are expected to be affected by the low temperatures and low light intensities under sea ice (BUNT et al., 1966; EPPLEY, 1972; COTA, 1985). In this study, photosynthetic responses to temperature and light intensities were analyzed using natural ice algal communities collected at Resolute Passage in April and May 1992 with particular emphases on the effects of low temperatures and low light intensities on photosynthesis. Light saturated gross-photosynthetic rates of ice algae determined at various temperatures between-1 and 20Â ° by means of the oxygen electrode method showed continuous increase along with increases of temperature from- 1 to 18'C. Higher gross-photosynthetic rates observed at higher temperatures indicated de-pression of photosynthesis by temperature within the experimental temperature range. Moreover, it has become clear that the photosynthetic rate increased |
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