Widespread Occurrence of the Hemiaulus-cyanobacterial Symbiosis in the Southwest North Atlantic Ocean
Abstract:Epifluorescent examination of Jive Hemiaulus spp. during September 1991 and January–February 1992 in the Bahama Islands, southwest North Atlantic Ocean, and Caribbean Sea indicated that 91–100% of the three diatom species noted contained diazotrophic cyanobacterial symbionts. This symbiosis was 5 to 254 times more abundant than the commonly reported Rhizosolenia-Richelia symbiosis, although the Hemiaulus symbionts were not generally visible in transmitted light in Jiving material. An additional 13 day-time series from Carrie Bow Cay, Belize found sustained high percentages of symbiotic Hemiaulus (average = 98%), suggesting these symbioses are persistent in tropical waters. Over 98% of the Hemiaulus spp. examined contained nitrogen-fixing symbionts. Additional observations on preserved material indicated the Hemiaulus symbioses were present at least as far north as 40°N in the Atlantic, and 31°N in the Pacific.
Document Type: Research Article
Publication date: 1994-01-01
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