English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Spatial distribution, cell division and cellular chlorophyll content were studied in populations of the diatom Nitzschja delicatula Hasle during the winter phytoplankton bloom in open waters of the Black Sea in 1991. This d ~ a t o m contributed 39 to 87 % (mean 72%) to phytoplankton biomass. Cell numbers were a s high as 6 X log cells mT3 and biomass was as high as 2.7 g m-3 The frequency of dividing cells in the population varied from 0 to 37 %. A diurnal rhythm in cell division was not observed. Production of ]V. delicatula was estimated from carbon biomass and the percentage of dividing cells in the population. High values of carbon biomass (3 to 5 g C m-2), production (1 to 3 g C m-2 d' ) and daily P/Bcoefficients (0.5 to 0 8) ind~cated the active growth of the population in the central parts of the western and eastern cyclonic gyres On average, for phytoplankton communities predominantly made up of N. dellcatula, estimated production was 2.3 times as high as primary production measured by the "C technique. Vertical changes of chlorophyll cell content were used as an index of the mix~ng in phytoplankton assemblages. Whlle phytoplankton biomass was inversely related to the mixed layer depth, population growth rate depended upon mixing activity in the upper water column.

Winter bloom of the diatom Nitzschia delicatula in the open waters of the Black Sea