Photosynthesis and respiration of some Arctic seaweeds

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Abstract
Both laboratory and in situ measurements of photosynthesis and respiration of some Arctic seaweeds were made. The temperature optima of these reactions were similar to those of temperate seaweeds and much higher than the local temperatures. However, reaction rates at low temperatures (as a percentage of the maximum rate) were higher than those reported for plants grown or collected at higher temperatures. Laboratory and in situ measurements resulted in similar estimates of compensating intensities. They also showed that little or no growth could be expected beneath snow-covered ice, but growth could occur beneath about 70 cm of ice cleared of snow.

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