Gulf Stream warm core rings: phytoplankton in two fall rings of different ages |
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Authors: | Fryxell, Greta A. Gould, R. W., Jr. Balmori, E. Rocio Theriot, E. C. |
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Affiliation: | Department of Oceanography, Texas A & M University College Station, TX 77843, USA 1Great Lakes Research Division, University of Michigan Ann Arbor, MI 48109, USA |
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Abstract: | Warm core ring (WCR) 82-H was sampled in SeptemberOctober(1982) as a Gulf Stream meander pinched off and became a ring.It is compared with the 3-month-old WCR 81-D, visited SeptemberOctober(1981). Although the rings have different histories, their phytoplanktonassemblages share some characteristics. Using cluster analysesbased on quantitative group counts, a station from one ringoccasionally clusters most closely with a station from the otherring, showing a similar balance of organisms. The younger ringat the time of sampling, WCR 82-H, had lower diversity, fewershelf species, and greater consistency between stations, exceptfor a high level of Oscillatoria in the meander before the ringpinched off. Interaction with slope water was seen principallyat the ring margin. WCR 81-D, on the other hand, showed a greatdeal of structure, and immediate dilutions with slope waterand the Gulf Stream were apparent, with higher diversity beforeand a week after such interactions. The upper water column ofwarm core rings, although showing evidence of physical mixing,can exhibit stratification of species, even after a storm. |
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