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Characterization of the coccolithophore community off Cabo Verde archipelago, including the Senghor Seamount (Eastern North Atlantic)
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Advisor(s)
Abstract(s)
A systematic investigation of the extant coccolithophore community around Cabo Verde archipelago was per formed during the cruise MSM49 of RV Maria S. Merian, which took place in the late fall of 2015. The description
of the spatial and vertical distributions of coccolithophores was based on a survey performed to the north, east
and south of Cabo Verde archipelago, between the surface and 150 m water depth. The total cell densities ob tained for the studied region were relatively low, reaching to a maximum of 30 × 103 cell L− 1 in the upper 50 m
over the southeastern slope of the Senghor seamount. Emiliania huxleyi and Gephyrocapsa oceanica were the
dominant species, followed by Florisphaera profunda. The coccolithophore distribution off Cabo Verde was
essentially explained by relatively warm and nutrient-depleted waters in the region during the surveyed interval,
in result of the weaker NE trade winds and the northward migration of the Intertropical Convergence Zone. In
these conditions, a notable zonation of coccolithophores along depth was depicted, in consequence of the
inferred general well-stratified water column. Four typical depth-related groups were identified: (i) a Shallow
oligotrophic (10–30 m), represented by Discosphaera tubifera and Umbellosphaera spp.; (ii) an Intermediate
(40–50 m), formed by the three placolith-bearing species E. huxleyi, G. ericsonii and G. oceanica, and by Algir osphaera robusta, Helicosphaera spp., Michaelsarsia spp., Syracosphaera spp. and Umbilicosphaera spp.; (iii) a Deep
(60–75 m) with F. profunda, Ophiaster spp., Oolithotus spp. and Reticulofenestra sessilis as typical members; (iv) and
The Deepest (>80 m), composed by Gladiolithus flabellatus and Syracosphaera lamina. In addition, high abun dances of G. oceanica related with the Eddy station were attributed to the transport and thriving of the coastal
coccolithophore community, dominated by this species, from the African coast towards Cabo Verde.
Description
Keywords
Extant coccolithophores Biodiversity Ecology Seamount Cyclonic eddy Eastern subtropical Atlantic Cabo Verde Archipelago . Faculdade de Ciências da Vida
Citation
Narciso, A., Javidpour, J., Chi, X., Cachão, M., & Kaufmann, M. (2021). Characterization of the coccolithophore community off Cabo Verde archipelago, including the Senghor Seamount (Eastern North Atlantic). Estuarine, Coastal and Shelf Science, 250, 107146. https://doi.org/10.1016/j.ecss.2020.107146
Publisher
Elsevier