Abstract
Diel vertical distributions and seasonal variations in abundance of three species of euthecosomatous pteropods characteristics of the Slope Water Region and two warm-water species are presented for two cold-core rings of the Gulf Stream. The cold-water species, Limacina retroversa, disappears from the cold-core rings within the first 5 months. One warm-water species, L. inflata, shows population increases of more than an order of magnitude within 5 months and then a decline to background Sargasso Sea levels. Daytime depths for this latter migratory species suggest a shallower migration in young to middle age cold-core rings.
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