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Gulf Stream warm core rings: phytoplankton in two fall rings of different ages

Gulf Stream warm core rings: phytoplankton in two fall rings of different ages Abstract Warm core ring (WCR) 82-H was sampled in September–October (1982) as a Gulf Stream meander pinched off and became a ring. It is compared with the 3-month-old WCR 81-D, visited September–October (1981). Although the rings have different histories, their phytoplankton assemblages share some characteristics. Using cluster analyses based on quantitative group counts, a station from one ring occasionally clusters most closely with a station from the other ring, showing a similar balance of organisms. The younger ring at the time of sampling, WCR 82-H, had lower diversity, fewer shelf species, and greater consistency between stations, except for a high level of Oscillatoria in the meander before the ring pinched off. Interaction with slope water was seen principally at the ring margin. WCR 81-D, on the other hand, showed a great deal of structure, and immediate dilutions with slope water and the Gulf Stream were apparent, with higher diversity before and a week after such interactions. The upper water column of warm core rings, although showing evidence of physical mixing, can exhibit stratification of species, even after a storm. This content is only available as a PDF. © IRL Press Limited http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Plankton Research Oxford University Press

Gulf Stream warm core rings: phytoplankton in two fall rings of different ages

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References (26)

Publisher
Oxford University Press
Copyright
© IRL Press Limited
ISSN
0142-7873
eISSN
1464-3774
DOI
10.1093/plankt/7.3.339
Publisher site
See Article on Publisher Site

Abstract

Abstract Warm core ring (WCR) 82-H was sampled in September–October (1982) as a Gulf Stream meander pinched off and became a ring. It is compared with the 3-month-old WCR 81-D, visited September–October (1981). Although the rings have different histories, their phytoplankton assemblages share some characteristics. Using cluster analyses based on quantitative group counts, a station from one ring occasionally clusters most closely with a station from the other ring, showing a similar balance of organisms. The younger ring at the time of sampling, WCR 82-H, had lower diversity, fewer shelf species, and greater consistency between stations, except for a high level of Oscillatoria in the meander before the ring pinched off. Interaction with slope water was seen principally at the ring margin. WCR 81-D, on the other hand, showed a great deal of structure, and immediate dilutions with slope water and the Gulf Stream were apparent, with higher diversity before and a week after such interactions. The upper water column of warm core rings, although showing evidence of physical mixing, can exhibit stratification of species, even after a storm. This content is only available as a PDF. © IRL Press Limited

Journal

Journal of Plankton Research – Oxford University Press

Published: Jan 1, 1985

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