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Co-occurrence of Dinoflagellate Blooms and High pH in Marine
Enclosures
Hinga, KR
Marine Ecology Progress Series MESEDT, Vol. 86, No. 2, p 181-187,
September 10, 1992. 5 fig, 57 ref. NSF Grant No. OCE-8817466 and
NOAA Cooperative Agreement No. NA90AA-H-CE53.
Data collected during two marine enclosure experiments in
Narragansett Bay were re-examined to investigate whether
dinoflagellate blooms may be linked to high pH levels in marine
environments. High abundances of dinoflagellates in mixed
phytoplankton populations in marine enclosures were strongly
correlated with high pH during 23 enclosure-years of weekly
samples. Diatom blooms were not similarly correlated with high pH.
The correlation with high pH was not the result of dinoflagellate
blooms themselves drawing down the CO2 and driving up the seawater
pH. Examination of individual blooms of > 500 cells/ml indicated
that dinoflagellate cell counts increased only after the pH was
driven high (i.e., > 8.5). High pH occurred either by natural
processes (diatom blooms) or, in one case, by an artificial
manipulation of the pH in the enclosure. There were nine periods
in which the seawater pH exceeded 8.5. Dinoflagellate blooms
occurred during 7 of these events. A high pH affinity for
dinoflagellates could help explain reported successional sequences
of diatom blooms followed by dinoflagellate blooms and the
association of dinoflagellate blooms with eutrophication. Seawater
pH should probably be included with other environmental factors in
studies of the mechanisms that control the occurrence of field
dinoflagellate blooms. (Author's abstract)
 Descriptors: *Algal blooms | *Dinoflagellates | *Hydrogen ion concentration | *Marine environment | *Marine pollution | *Narragansett Bay | *Water
pollution effects | Algal growth | Correlation analysis | Diatoms | Environmental effects | Eutrophication | Field tests | Phytoplankton
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