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Distribution and occurrence of Gymnodinium breve on the West Coast of Florida, 1964-1965
Dragovich, A.; Kelly, J.A. (1966). Distribution and occurrence of Gymnodinium breve on the West Coast of Florida, 1964-1965. Special scientific report - Fisheries, 541. [S.n.]: [s.l.].
Part of: Special scientific report - Fisheries. US Department of the Interior. Fish and Wildlife Serivice. Bureau of Commercial Fisheries. ISSN 0097-3653, more

Keywords
    Geographical distribution; Red tides; Runoff; Salinity data; Temperature data; Temporal distribution; Vertical distribution; Gymnodinium breve C.C.Davis, 1948 [WoRMS]; ASW, Mexico Gulf [Marine Regions]; ASW, USA, Florida [Marine Regions]; Marine

Authors  Top 
  • Dragovich, A.
  • Kelly, J.A.

Abstract
    The distribution and monthly occurrence of Gymnodinium breve, the Florida red-tide organism, were determined over a period of 13 months (in 1964-65) in the coastal waters of west Florida, USA. Counts of G. breve varied from 0 to 53,800 cells per litre of water; no fish kills were observed. The organism was present at all stations from 9.3 km (5 miles) to 37.1 km (20 miles) offshore. It was not present in samples from Tampa Bay, and it was found only twice in samples from Charlotte Harbor. The highest occurrence of G. breve was in samples taken 27.8 km. (15 miles) offshore. Vertical distribution of the species was greatest at the surface and at 5 m. and lowest at 20 m. The largest concentrations of G. breve occurred in September during a period of reduced salinity and temperature. Because these two factors are important to the ecology of the organism, their relation to the presence or absence of G. breve is discussed. G. breve were found within the temperature range 13.8 °C to 30.6 °C. It was absent or rare at both the low and high temperatures; cell densities greater than 1,000 per litre were observed from 26.00 °C to 27.9 °C. The organism occurred at salinities ranging from 33.68 to 37.07 ppt. The highest concentration of cells and incidence was noted within the salinity range 35.00 to 36.90 ppt.

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