Influence of hydrography on phytoplankton distribution in the Amundsen and Ross Seas, Antarctica

Fragoso, Glaucia Moreira; Smith, Walker O

doi:10.1016/j.jmarsys.2011.07.008

Cited by 64 publications

(49 citation statements)

References 52 publications

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“…To predict the impacts of these changes on ecosystems, it is important to understand the dynamics of the plankton community. Although oceanographic surveys have been conducted in the Amundsen Sea, ecological studies of plankton have concentrated on primary production, ciliates, mesozooplankton, and krill Fragoso and Smith, 2012;Lee et al, 2012Lee et al, , 2013. Three studies on ciliates have focused on the species composition, morphology, and phylogeny of ciliates Kim et al, 2013;Jiang et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Microzooplankton herbivory and community structure in the Amundsen Sea, Antarctica

Yang

Jiang

Lee

2016

Deep Sea Research Part II: Topical Studies in Oceanography

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Section: Introductionmentioning

confidence: 99%

Microzooplankton herbivory and community structure in the Amundsen Sea, Antarctica

Yang

Jiang

Lee

2016

Deep Sea Research Part II: Topical Studies in Oceanography

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“…The relative contributions of prymnesiophytes and diatoms reflect a complex interplay of physical circulation/mixing conditions, the light environment, and concentrations of macro-and micro-nutrients. A better understanding of the physical forcing of these communities is important because community composition has biogeochemical implications and this regional system is changing (Arrigo et al, 1999;Alderkamp et al, 2012;Fragoso and Smith, 2012). For example, P. antarctica takes up twice as much CO 2 per mole of phosphate removed as diatoms (Arrigo et al, 1999), it is not a preferred prey of microzooplankton (Caron et al, 2000), and its presence has been linked to dimethyl sulfide cycling between the ocean and atmosphere (Liss et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

In situ phytoplankton distributions in the Amundsen Sea Polynya measured by autonomous gliders

Schofield

Miles

Alderkamp

et al. 2015

Elementa: Science of the Anthropocene

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The Amundsen Sea Polynya is characterized by large phytoplankton blooms, which makes this region disproportionately important relative to its size for the biogeochemistry of the Southern Ocean. In situ data on phytoplankton are limited, which is problematic given recent reports of sustained change in the Amundsen Sea. During two field expeditions to the Amundsen Sea during austral summer 2010-2011 and 2014, we collected physical and bio-optical data from ships and autonomous underwater gliders. Gliders documented large phytoplankton blooms associated with Antarctic Surface Waters with low salinity surface water and shallow upper mixed layers (< 50 m). High biomass was not always associated with a specific water mass, suggesting the importance of upper mixed depth and light in influencing phytoplankton biomass. Spectral optical backscatter and ship pigment data suggested that the composition of phytoplankton was spatially heterogeneous, with the large blooms dominated by Phaeocystis and non-bloom waters dominated by diatoms. Phytoplankton growth rates estimated from field data (≤ 0.10 day −1 ) were at the lower end of the range measured during ship-based incubations, reflecting both in situ nutrient and light limitations. In the bloom waters, phytoplankton biomass was high throughout the 50-m thick upper mixed layer. Those biomass levels, along with the presence of colored dissolved organic matter and detritus, resulted in a euphotic zone that was often < 10 m deep. The net result was that the majority of phytoplankton were light-limited, suggesting that mixing rates within the upper mixed layer were critical to determining the overall productivity; however, regional productivity will ultimately be controlled by water column stability and the depth of the upper mixed layer, which may be enhanced with continued ice melt in the Amundsen Sea Polynya.

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“…Among the polynyas, the Amundsen Sea polynya is one of the highest regions of productivity reaching up to 2.2 g C m -2 day -1 in the Southern Ocean (Lee et al 2012). Although the primary production in the Amundsen Sea polynya has been estimated by satellite observations (Arrigo and van Dijken 2003;Arrigo et al 2008Arrigo et al , 2012, few in situ measurements of phytoplankton productivity have been made in the Amundsen Sea to date due to the difficulty in accessing the area due to the sea ice cover (Fragoso and Smith 2012;Lee et al 2012;Hahm et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Large seasonal variation in phytoplankton production in the Amundsen Sea

et al. 2014

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To better estimate annual primary production in the Amundsen Sea, which is one of the highest productivity regions in the Southern Ocean, the seasonal variations in carbon and nitrogen uptake rates of phytoplankton were investigated in this study. Based on 13 C-15 N dual isotope tracer techniques, the average daily productivities for the Amundsen polynya (AP), Pine Island polynya (PIP) and nonpolynya regions were 0.25, 0.16 and 0.12 g C m -2 day -1 , respectively. The average daily uptake rates of total nitrogen were 60.2, 53.5 and 34.8 mg N m -2 day -1 for the AP, PIP and non-polynya stations, respectively. In spite of the high concentration of nitrate in the Amundsen Sea, daily nitrate uptake rates (mean ± SD = 0.02 ± 0.01 g N m -2 day -1 ) were lower than ammonium uptakes for all productivity stations in this study, which resulted in a significantly lower f-ratio (mean ± SD = 0.44 ± 0.24) than that (mean ± SD = 0.71 ± 0.15) of the previous year. The substantially lower uptake rates of carbon and nitrogen and the f-ratio, especially in the AP, are due to a large seasonal variation in the uptake rates mainly caused by the shorter daytime duration and partly due to lower light availability induced by deeper mixed conditions in the present study compared with the previous study in 2010/2011. The large seasonal variation in daily phytoplankton production should be considered to better estimate annual production as a basic food source for higher trophic levels in the Amundsen Sea.

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Influence of hydrography on phytoplankton distribution in the Amundsen and Ross Seas, Antarctica

Cited by 64 publications

References 52 publications

Microzooplankton herbivory and community structure in the Amundsen Sea, Antarctica

Microzooplankton herbivory and community structure in the Amundsen Sea, Antarctica

In situ phytoplankton distributions in the Amundsen Sea Polynya measured by autonomous gliders

Large seasonal variation in phytoplankton production in the Amundsen Sea

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