Widespread Occurrence of the Hemiaulus-cyanobacterial Symbiosis in the Southwest North Atlantic Ocean
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.
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Document Type: Research Article
Publication date: 1994-01-01
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