Quasi K-Selected Species, Equivalence, and the Oceanic Coccolithophorid Plankton
Coccolithophore species, other than Emiliania huxleyi and Gephyrocapsa oceanica, make up a group of about 20 species in the western North Atlantic and the Mediterranean. Most of the species are the same in both places and provide the same ordered decrease of abundances in both places, suggesting an equilibrium condition. Thus we may say 'if, given any species, one species belongs to a diverse coccolithophore group, then it occurs under equilibrium conditions and occurs in the deep ocean'; this implies 'if the given species does not occur under equilibrium conditions or does not occur in the deep ocean, then it does not belong to such a diverse group.' Along the coast of Colombia and Ecuador in the Pacific growth conditions result in very uneven plankton concentrations indicating lack of equilibrium and the diversity of coccolithophores is reduced, certifying 'if the given species does not occur under equilibrium conditions, then it does not belong to a diverse coccolithophore group.' In the Gulf of Persia the water is quite shallow, making possible stranding of coccolithophores on the bottom during the unstratified winter period, and just a very few coccolithophore species are present. So this certifies 'if the given species does not occur in the deep ocean, then it does not belong to a diverse coccolithophore group.'
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Document Type: Research Article
Publication date: 1983-04-01
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