期刊
MARINE ENVIRONMENTAL RESEARCH
卷 144, 期 -, 页码 154-165出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.marenvres.2018.12.003
关键词
Phytoplankton pigments; Anticyclonic eddies; Agulhas leakage; Agulhas rings
资金
- Brazilian Coastal Monitoring System (SiMCosta)
- Brazilian National Council for Scientific and Technological Development (CNPq)
- Brazilian Federal Agency for Coordination of Improvement of Higher Education Personnel (CAPES)
- Brazilian Secretariat of the Inter-ministerial Commission for the Sea Resources (SECIRM)
- Brazilian Navy
- CAPES Foundation [23038.001421/2014-30]
- CAPES Ph.D. grant [88882.182314/2018-01]
- CNPq [302604/2015-4]
This study describes the pigment-based phytoplankton community within three South Atlantic anticyclonic eddies (at different ages) shed from the Agulhas Current retroflection crossing the South Atlantic Ocean. Seawater samples were collected over these mesoscale structures in June-July 2015 during the Following Ocean Rings in the South Atlantic (FORSA) cruise. Data on phytoplankton pigments, measured with high-performance liquid chromatography (HPLC), were processed using a chemical taxonomy (CHEMTAX) tool to determine and quantify phytoplankton taxonomic groups. In addition, physical (water column structure) and chemical (macronutrient) parameters were determined and related to the biological data. Our results showed that, in general, the community was composed mostly of small flagellates (haptophytes) and prokaryotes (Prochlorococcus) and that pelagophytes were prominent in the younger eddy. This ring, located in the eastern basin of the South Atlantic Ocean, represented a younger and stronger structure, with no evident deep chlorophyll maximum (DCM) depth and an evenly distributed biomass over a well-mixed upper layer, revealing a more diverse phytoplankton community. The weakened structures of the older western eddies presented a pronounced DCM depth below 100 m and similar phytoplankton community composition patterns marked by enhanced Prochlorococcus contributions but also the important occurrences of haptophytes at the DCM depth and Synechococcus and chlorophytes at the surface. The community distributions in all three structures were associated with the distribution of nutrients and acclimation to light conditions. This study contributes to a better understanding of the phytoplankton distribution and its association with the presence of mesoscale anticyclonic eddies in an undersampled and complex region of the South Atlantic Ocean.
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