Environmental controls onEmiliania huxleyimorphotypes in the Benguela coastal upwelling system (SE Atlantic)

Environmental controls onEmiliania huxleyimorphotypes in the Benguela coastal upwelling system (SE Atlantic)

ABSTRACT: Two distinct morphotypes of the coccolithophoreEmiliania huxleyiwere observed as part of the phytoplankton succession offshore of Namibia, where coastal upwelling created strong gradients in sea surface temperature (SST), salinity, and nutrient conditions. The sampled surface waters hosted...

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Veröffentlicht in:Marine Ecology Progress Series. - Inter-Research Science Center, 1979. - 448(2012) vom: Feb., Seite 51-66
1. Verfasser: Henderiks, Jorijntje (VerfasserIn)
Weitere Verfasser: Winter, Amos, Elbrächter, Malte, Feistel, Rainer, van der Plas, Anja, Nausch, Guenther, Barlow, Ray
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2012
Zugriff auf das übergeordnete Werk:Marine Ecology Progress Series
Schlagworte:Emiliania huxleyi Morphology Ecology Plankton succession Coastal upwelling Namibia Physical sciences Biological sciences Applied sciences
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520 |a ABSTRACT: Two distinct morphotypes of the coccolithophoreEmiliania huxleyiwere observed as part of the phytoplankton succession offshore of Namibia, where coastal upwelling created strong gradients in sea surface temperature (SST), salinity, and nutrient conditions. The sampled surface waters hosted a characteristic succession of phytoplankton communities: diatoms bloomed in newly upwelled waters above the shelf, whereas dense coccolithophore communities dominated byE. huxleyiwere found farther offshore, in progressively aging upwelled waters. A substantially calcifiedE. huxleyimorphotype (labeled Type A*) dominated plankton assemblages at stations influenced by upwelling, that immediately succeeded coastal diatom blooms. This morphotype caused a chlorophyll and 19’-hexanoyloxyfucoxanthin (19’-HF) maximum with >1 × 10⁶ cells l−1, straddling a pycnocline at 17 m depth where thein situN:P ratio was ≈13. Farther offshore, within <20 nautical miles distance, populations of Type A* drastically declined, and a more delicate morphotype with thin distal shield elements and open central area (Type B/C) was found. This morphotype was most abundant (~0.2 × 10⁶ cells l−1) in high-phosphate, nitrogen-depleted surface waters (N:P ≈ 8), where it co-existed with other coccolithophores, most notablySyracosphaeraspp. Extensive surface blooms of coccolithophores observed by satellites in the same region in the past were identified by microscopy as being produced byE. huxleyiandS. pulchra. However, blooms ofE. huxleyiat greater depths in the euphotic zone, such as those observed in this study, will go undetected by satellites and thus underestimate coccolithophore biomass and calcification within upwelling regions. 
540 |a © Inter-Research 2012 
650 4 |a Emiliania huxleyi 
650 4 |a Morphology 
650 4 |a Ecology 
650 4 |a Plankton succession 
650 4 |a Coastal upwelling 
650 4 |a Namibia 
650 4 |a Physical sciences  |x Earth sciences  |x Hydrology  |x Water  |x Upwelling water 
650 4 |a Physical sciences  |x Earth sciences  |x Hydrology  |x Water  |x Saltwater  |x Sea water 
650 4 |a Biological sciences  |x Biology  |x Botany  |x Marine botany  |x Phycology  |x Algae  |x Diatoms 
650 4 |a Biological sciences  |x Biology  |x Marine biology  |x Aquatic organisms  |x Plankton  |x Phytoplankton 
650 4 |a Physical sciences  |x Earth sciences  |x Hydrology  |x Limnology  |x Surface water 
650 4 |a Physical sciences  |x Earth sciences  |x Geography  |x Geomorphology  |x Bodies of water  |x Oceans 
650 4 |a Biological sciences  |x Biochemistry  |x Biomolecules  |x Biological pigments  |x Chlorophylls 
650 4 |a Biological sciences  |x Biology  |x Marine biology  |x Aquatic organisms  |x Plankton 
650 4 |a Applied sciences  |x Materials science  |x Materials  |x Pigments 
650 4 |a Physical sciences  |x Earth sciences  |x Hydrology  |x Water samples 
655 4 |a research-article 
700 1 |a Winter, Amos  |e verfasserin  |4 aut 
700 1 |a Elbrächter, Malte  |e verfasserin  |4 aut 
700 1 |a Feistel, Rainer  |e verfasserin  |4 aut 
700 1 |a van der Plas, Anja  |e verfasserin  |4 aut 
700 1 |a Nausch, Guenther  |e verfasserin  |4 aut 
700 1 |a Barlow, Ray  |e verfasserin  |4 aut 
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856 4 0 |u https://www.jstor.org/stable/24875846  |3 Volltext 
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