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International Journal on Algae
SJR: 0.219 SNIP: 0.261 CiteScore™: 0.24

ISSN Print: 1521-9429
ISSN Online: 1940-4328

International Journal on Algae

DOI: 10.1615/InterJAlgae.v4.i2.90
pages 112-124

Influence of environmental factors on the metabolism of oxygen in the population of Ahnfeltia tobuchiensis (Kanno et Matsubara) Mak. (Ahnfeltiales, Rhodophyta)

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

ABSTRACT

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.