PHOTOSYNTHETIC NATURE OF ICE ALGAE AND THEIR CONTRIBUTION TO THE PRIMARY PRODUCTION
Abstract: Photosynthetic activity of ice algae and phytoplankton was investi-gated under sea ice at two stations (ca. 44010fN, 143'46'E) in lagoon Saroma KO, Hokkaido, Japan, in early March 1987. Water temperature and salinity ranged from-1.1 to-1.4OC and from 32.4 to 33.5, respectively. T...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.553.6384 http://polaris.nipr.ac.jp/~penguin/polarbiosci/issues/pdf/1989-Satoh.pdf |
| Summary: | Abstract: Photosynthetic activity of ice algae and phytoplankton was investi-gated under sea ice at two stations (ca. 44010fN, 143'46'E) in lagoon Saroma KO, Hokkaido, Japan, in early March 1987. Water temperature and salinity ranged from-1.1 to-1.4OC and from 32.4 to 33.5, respectively. The maximum chlorophyll a concentrations of ice algae within 4 cm from the bottom of sea ice and phytoplankton in water column were 385 and 0.77 mg m-3, respectively. The maximum photosynthetic rate (1.12 mg02 mgchl. a-I h-1) of ice algae was obtained under 37.5 pE m- = s-l, which corresponds to only 3 % of incident solar radiation. These results demonstrate the low-light adaptation of ice algae grown under low light conditions. The optimum temperature for photosynthesis of ice algae was around 8OC. In situ measurements on a clear day gave the primary production of 1.59mgC m-2 h-I by ice algae and that of 1.92mgC m- = h-I by phytoplankton. It was concluded that the ice algae contribute to a considerable extent to the pro-duction of organic carbon in the ice-covered area of Saroma KO during winter. 1. |
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