The spatial distribution of silicoflagellates in the region of the Gulf Stream warm-core ring 82B: application to water mass tracer studies

K. Takahashi, P. L. Blackwelder

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Six taxa of silicoflagellates were found. Three major taxa dominated standing stocks: Distephanus speculum, Dictyocha messanensis (intermediate-sized form) and D. mandrai. D. speculum, considered a cold-water taxon in the literature, showed a higher standing stock in the cooler high-velocity region of the warm-core ring, continental shelf and slope waters. Fewer were present in the warmer ring center, Gulf Stream and Sargasso Sea. D. mandrai showed a similar distribution to that of D. speculum, but its preference for slightly warmer waters (>10°C) was noted. Dictyocha messanensis and Distephanus pulchra, known to be warm-water taxa, were relatively abundant in the warm ring center. In contrast to standing stock data, ratios between cold- and warm-water taxa correlate well with temperature and salinity in the warm-core ring. Since these ratios are not effected by convective loss, they are excellent water mass tracers in this system. Distribution of the silicoflagellate taxa suggests that WCR82B April had a higher affinity with the Gulf Stream than the Sargasso Sea. Silicoflagellate species distributions are highly correlative with water masses. -from Authors

Original languageEnglish (US)
Pages (from-to)S327-S346
JournalDeep-Sea Research, Part A: Oceanographic Research Papers
Volume39
Issue number1 A Suppl.
DOIs
StatePublished - 1992
Externally publishedYes

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

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