International Journal on Algae

ISSN for PRINT: 1521-9429

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2002, Volume4

Issue 2

128 pages

Issue price - $216.00

I. I. Cherbadgy
Institute of Marine Biology, the Far East Branch of the Russian Academy of Sciences, 17, Palchevskogo St., 690041 Vladivostok, Russia

L. I. Popova
Institute of Marine Biology, the Far East Branch of the Russian Academy of Sciences, 17, Palchevskogo St., 690041 Vladivostok, Russia

Integrated studies on the influence of environmental factors, including temperature, photosynthetically active radiation, NH₄⁺, PO₄³⁻, and oxygen concentration, and also the content of nitrogen, phosphorus, organic carbon, and chlorophyll a in tissues of the alga, on the metabolism of oxygen (MO₂) in an Ahnfeltia tobuchiensis (Kanno et Matsubara) Mak. population were carried out in Izmena Bay on Kunashir Island in June 1997 and August 1999. Samples were taken at 14 stations under natural conditions. The agarophyte A. tobuchiensis, belonging to Rhodophyta, forms an unattached layer 50 cm thick within on area of 30.2 km². Its biomass is 144,000 tons. The light curves of the layer formed by A. tobuchiensis were measured at various stations differing in the concentration of NH₄⁺ and PO₄³⁻. Oxygen saturation was not recorded with photosynthetically active radiation at 300 μE · m⁻² · s⁻¹. The compensation point of photosynthesis was recorded at 0.1−0.5 μE · m⁻² · s⁻¹ or 0.006−0.03 % of photosynthetically active radiation. The regression equation describing oxygen metabolism depending on the complex of the environmental factors was established. It has been found that the intensity of photosynthetically active radiation accounting for about 78 % of the variability of MO₂ is the main factor determining the rate of MO₂ was in the population. The rate of MO₂ to a lesser extent depends on the concentration of chlorophyll a and water temperature. The influence of other factors on the variability of MO₂ is insignificant, m some cases, processes of production in the population may be limited by the concentration of nitrogen compounds. This phenomenon may be registered in shallow-water sections at the surface of the layer, where the intensity of photosynthetieally active radiation is not more than 300 μE · m⁻² · s⁻¹.

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