Response of coccolithophore communities to oceanographic and atmospheric processes across the North- and Equatorial Atlantic

• Published in: Frontiers in Marine Science
• Main Authors: Guerreiro, Catarina, Ferreira, Afonso, Cros, Lluïsa, Stuut, Jan-Berend, Baker, Alex R., Tracana, Andreia, Veloso, Vera, Rees, Andrew P., Cachão, Mário, Nunes, Telmo, Brotas, Vanda
• Other Authors: European Commission, Natural Environment Research Council (UK)
• Format: Article in Journal/Newspaper
• Language: English
• Published: Frontiers Media 2023
• Subjects: Coccolithophores; Phytoplankton; Ecological gradients; Nutricline; Westerly Wind Biome; Trade Wind Biome; Saharan dust; Atlantic Meridional Transect; Conserve and sustainably use the oceans; seas and marine resources for sustainable development; North Atlantic
• Online Access: http://hdl.handle.net/10261/313465; https://doi.org/10.3389/fmars.2023.1119488

29 pages, 12 figures, 2 tables, 1 appendix, supplementary material https://www.frontiersin.org/articles/10.3389/fmars.2023.1119488/full#supplementary-material.-- Data availability statement: The original contributions presented in the study are included in the article/Supplementary Material. Further inquiries can be directed to the corresponding author Changes in coccolithophore productivity in response to climate-driven ocean warming are likely to have cascading biogeochemical effects that feed back to the changing climate. This paper investigates the role (and interplay) of large-scale oceanographic and atmospheric processes across the North- and Equatorial Atlantic, including Saharan dust deposition, on the distribution of coccolithophore communities. The study is based on biological and hydrological data collected across the photic zone of the ocean, and aerosol data collected from the lower atmosphere, across 50°N–1°S during the Atlantic Meridional Transect in boreal Autumn of 2018 (AMT28), in synergy with Earth Observations. Results confirm existing understanding of the distribution of coccolithophore communities which are related to major meridional hydrological gradients across the North Atlantic. Dynamic, oxygenated and microphytoplankton-enriched waters at higher-latitudes were characterized by less diverse coccolithophore populations, dominated by placolith-bearing r-selected coccolithophores. In contrast, the heavily stratified and picoplankton-enriched waters of the subtropical gyre revealed more diverse populations, dominated by umbelliform coccolithophores and holococcolithophores at the surface, and by floriform taxa in the lower photic zone. Mean concentrations of 14.4×103 cells/L present in the North Atlantic Tropical Gyre Province (30–12°N), only slightly lower compared to 17.7×103 cells/L produced in the North Atlantic Drift province (50–40°N), provide a snapshot perspective on the importance of coccolithophore production in heavily stratified gyre conditions. Higher concentrations of ...