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Connecting pigment composition and dissolved trace elements to phytoplankton population in the southern Benguela Upwelling zone (St. Helena Bay)
Presidency University, India.
Linköping University, Department of Thematic Studies, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences.
Stellenbosch University, South Africa.
Marine Ecoanalyt, Netherlands.
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2017 (English)In: Journal of Marine Systems, ISSN 0924-7963, E-ISSN 1879-1573, Vol. 176, 13-23 p.Article in journal (Refereed) Published
Abstract [en]

Rich in upwelled nutrients, the Southern Benguela is one of the most productive ecosystems in the world ocean. However, despite its ecological significance the role of trace elements influencing phytoplankton population in the Southern Benguela Upwelling System (SBUS) has not been thoroughly investigated. Here, we report pigment composition, macronutrients (nitrate, phosphate and silicate) and concentrations of dissolved Cd, Co, Fe and Zn during late austral summer and winter seasons in 2004 to understand the relationship between the selected trace elements and phytoplankton biomass in St. Helena Bay (SHB), which falls within the southern boundary of the SBUS. Chlorophyll a concentrations indicate higher phytoplankton biomass associated with high primary production during late summer in SHB where high diatom population is inferred from the presence of fucoxanthin. Diminished phytoplankton biomass and a shift from diatoms to dinoflagellates as the dominant phytoplankton taxa are indicated by diagnostic pigments during late winter. Dissolved trace elements (Cd, Co and Zn) and macronutrients play a significant role in phytoplankton biomass, and their distribution is affected by biological uptake and export of trace elements. Continuous uptake of Zn by diatoms may cause an onset of Zn depletion leading to a period of extended diatom proliferation during late summer. Furthermore, the transition from diatom to dinoflagellate dominated phytoplankton population is most likely facilitated by depletion of trace elements (Cd and Co) in the water column.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2017. Vol. 176, 13-23 p.
Keyword [en]
Benguela Upwelling; Nutrients; Trace elements; Phosphate; Nitrate; Pigments
National Category
Ecology
Identifiers
URN: urn:nbn:se:liu:diva-142825DOI: 10.1016/j.jmarsys.2017.07.009ISI: 000413280000002OAI: oai:DiVA.org:liu-142825DiVA: diva2:1154964
Note

Funding Agencies|VR [2008-508]; SIDA-NRF; SMF; EAOG

Available from: 2017-11-06 Created: 2017-11-06 Last updated: 2017-11-06

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
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  • Other style
More styles
Language
  • de-DE
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  • nn-NB
  • sv-SE
  • Other locale
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Output format
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  • asciidoc
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