Production characteristics of the population of the red algaAhnfeltia tobuchiensis in Baklan Bight (Peter the Great Bay, Sea of Japan) |
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Authors: | D A Nekrasov I I Cherbadzhi L I Popova |
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Institution: | (1) Institute of Marine Biology, Far East Division, Russian Academy of Sciences, 690041 Vladivostok, Russia |
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Abstract: | Spatial distribution and production characteristics of the population of the unattached red algaAhnfeltia tobuchiensis (Kanno and Matsubara) Mak were studied in Baklan Bight (Sea of Japan) in September 1990 and June 1991. The following environmental
factors were determined: the level of photosynthetically active radiation (PAR) penetrating the water column; the water temperature;
and the content of oxygen, nitrogen, phosphorus, and dissolved organic substance. the main factor limiting the net primary
production (NPP) of theA. tobuchiensis population in Baklan Bight appears to be PAR intensity at the surface of the stratum. In June and September, respectively
it constituted about 10% and 0.2% of the PAR on the sea surface. By means of regression analysis, the following equations
were obtained to describe the relationship between NPP at the surface of the stratum and the environmental factors studied,
PAR intensity being the principal variable: NPP=0.02+0.81 PAR (in June) and NPP=0.02+0.23PAR (in September). In June and September,
the NPP of theA. tobuchiensis stratum amounted to 17.2 and 1.3 g/(m2 day), and the biomass to 21 and 31 thousand tons, respectively. During the eight months, its distribution changed considerably.
In June and September, the daily biomass growth equaled 140.7 and 8.5 t, respectively. A 10-cm-thick layer displayed the highest
production characteristics. |
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Keywords: | Ahnfeltia tobuchiensis primary production environmental conditions |
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