An investigation conducted in a Polar Frontal Zone site (26–40°W, 48–52°S) in the spring-summer season of 1988–1989 was followed by four smaller surveys. The study of abiotic conditions included measurements of O2, NO3, PO4, SiO2 etc.
Smaller-scale surveys conducted after the basic survey showed that, due to intensive phytoplankton growth, autotrophic organisms were actively consuming nutrients yielding high concentrations of chlorophyll ‘a’ (4.5 μg l−1). Silicate dropped from 10–55 μM to less than 2.5 μM, and phosphate from 1.8 –2.0 to 0.85 μM. Phytoplankton blooms resulted in a spatial redistribution of abiotic gradient zones and the formation of ‘biological’ fronts. Thus, the silicate horizontal gradient at such fronts amounted to 7.22 μM per k.
An investigation conducted in a Polar Frontal Zone site (26–40°W, 48–52°S) in the spring-summer season of 1988–1989 was followed by four smaller surveys. The study of abiotic conditions included measurements of O2, NO3, PO4, SiO2 etc.
Smaller-scale surveys conducted after the basic survey showed that, due to intensive phytoplankton growth, autotrophic organisms were actively consuming nutrients yielding high concentrations of chlorophyll ‘a’ (4.5 μg l−1). Silicate dropped from 10–55 μM to less than 2.5 μM, and phosphate from 1.8 –2.0 to 0.85 μM. Phytoplankton blooms resulted in a spatial redistribution of abiotic gradient zones and the formation of ‘biological’ fronts. Thus, the silicate horizontal gradient at such fronts amounted to 7.22 μM per k.
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