Structure of the Community of Planktic Algae of the White Sea in Relation to Availability of Oxidized or Reduced Forms of Nitrogen and Level of Illuminationстатья
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Аннотация:Phytoplankton sampled in Kandalaksha Bay of the White Sea in late June 2006 was exposed in situ
for 14 days under two levels of illumination (E1 > E2) with the addition of 180 μM of nitrogen as nitrate, urea,
ammonium, and glycine. Every 3 days, species composition, abundance, and biomass of algae were esti
mated. The maximum biomass (Bmax) of phytoplankton depended on nitrogen substrates and level of illumi
nation. The differences in Bmax between phytoplankton assimilating different nitrogen substrates became
more apparent under E2. Phytoplankton assimilating nitrates, urea, and ammonium had higher Bmax under
E1, but algae grown with glycine had higher Bmax under E2. Although the values of Bmax differed, the structures
of all assemblages were similar except for that grown on ammonium under E1. Competitive parameters of
algae populations depended on the form of nitrogen and level of illumination in a speciesspecific manner.
Comparison of the present data with results of similar experiments in 2005 revealed that structure of assem
blages formed after nitrogen pulse additions depended not only on nitrogen forms and illumination level but
also on initial (before pulse) structure of community and availability of nitrogen for algae.