Between February 1971 and February 1972 monthly measurements of phytoplankton primary production were made at six stations in Langebaan Lagoon. The gross primary production rates obtained showed a marked seasonal variation. They increased from 261,6 mgC/m 3jday in winter to 675,4 mgC/m 3jday in spring and to a maximum of 885,3 mgCjm 3jday in summer. Production rates ranged from 611,0 mgC/m 3jday at the entrance of the lagoon to 162,6 mgC/m 3jday at the station nearest to the head of the lagoon. A correlation between total chlorophyll and gross primary production was established for the lagoon, and was used in conjunction with chlorophyll concentrations and water transparency measurements from Saldanha Bay to estimate the gross primary production for the bay. The estimates ranged from 864,9 mgC/m 2jday to 3 301,2 mgC/m 2jday.
OPSOMMINGVanaf Februarie 1971 tot Februarie 1972 is maandelikse bepalings van primere produktiwiteit in die Langebaan-strandmeer gedoen. Die bruto primere produksietempo het 'n merkbare seisoenswisseling getoon. Dit het gewissel van 261,6 mgC/m 3jdag in die winter tot 675,4 mgC/m 3jdag in die lente en tot'n maksimum van 885,3 mgCjm 3jdag in die somer. Produksietempo's het in die strandmeer gewissel vanaf 611,0 mgC/m 3jdag by die ingang tot 162,6 mgCjm 3jdag by die stasie naaste aan die onderent van die strandmeer. 'n Korrelasie tussen totale chlorofil-en bruto prirnere produksie is vasgestel in die strandmeer en is tesame met chlorofilkonsentrasies en deursigtigheid van die water gebruik om die bruto primere produksie van die hele baai te bereken. Die beramings wat so verkry is, het gewissel van 864,9 mgC/m 2jdag tot 3 301,2 mgC/m 2jdag.
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