Multiscale control of bacterial production by phytoplankton dynamics and sea ice along the western Antarctic Peninsula: A regional and decadal investigation

Ducklow, Hugh W.; Schofield, Oscar; Vernet, María; Stammerjohn, Sharon; Erickson, Michelle A.

doi:10.1016/j.jmarsys.2012.03.003

Cited by 77 publications

(97 citation statements)

References 74 publications

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“…Although the bacterial productivity (BP) data set is limited to the last decade (2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012), the variability in the anomalies follows those of chl-a (Fig. 1a), likely because phytoplankton in Antarctic waters provide the main source of dissolved organic carbon for bacterial growth 23 . The two dominant phytoplankton groups in the region are diatoms and cryptophytes (as determined by accessory pigment analysis, see Methods section).…”

Section: Resultsmentioning

confidence: 99%

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Winter and spring controls on the summer food web of the coastal West Antarctic Peninsula

Fraser²,

et al. 2014

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Section: Resultsmentioning

confidence: 99%

“…1a. is estimated from the rate of 3H-leucine incorporation measured in 3-6 h incubations performed in the laboratory at Palmer Station in the dark at in situ temperatures 46 . BP was converted from leucine incorporation rates using the factor 1,500 g C biomass produced per mole leucine incorporated.…”

Section: Methodsmentioning

confidence: 99%

Winter and spring controls on the summer food web of the coastal West Antarctic Peninsula

Fraser²,

et al. 2014

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“…Moderately low bacterial abundances (e.g. Ducklow et al 2001Ducklow et al , 2012 have been hypothesized to result in less scattering in the blue wavelengths than typical ocean waters (Dierssen & Smith 2000). The fucoxanthin algorithm we employed also relies on the blue wavelengths, thus it is possible that shifts in bacterial abundances and/or increased glacial melt will result in spatial and temporal biases of the algorithm.…”

Section: Discussionmentioning

confidence: 99%

“…Ducklow et al 2012), a 1°C increase in sea surface temperature (SST) (Meredith & King 2005), and a 0.7°C increase in subsurface ocean temperature attributed to both ocean warming and changes in ocean circulation , Martinson 2012. Changes in regional wind patterns and seasonal ice−ocean feedbacks have led to a decline in the duration of seasonal sea ice cover by nearly 90 d since the beginning of satellite-based measurements in 1979 .…”

Section: Introductionmentioning

confidence: 99%

Effect of continental shelf canyons on phytoplankton biomass and community composition along the western Antarctic Peninsula

Kavanaugh¹,

Abdala²,

Ducklow³

et al. 2015

Mar. Ecol. Prog. Ser.

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“…For the past 2 decades, the WAP marine ecosystem has been experiencing rapid warming and reduction in total sea ice cover in winter (30), which may signifi-cantly increase bacterial activity and carbon fluxes (4). Our goal was to determine whether differences in leucine incorporation previously observed among the three different clades (12) translate to differences in their contribution to the use of various types of DOM.…”

mentioning

confidence: 99%

Uptake of Dissolved Organic Carbon by Gammaproteobacterial Subgroups in Coastal Waters of the West Antarctic Peninsula

Nikrad

Cottrell

Kirchman

2014

Appl Environ Microbiol

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Heterotrophic bacteria are well known to be key players in the turnover of dissolved organic material (DOM) in the oceans, but the relationship between DOM uptake and bacterial clades is still not well understood. Here we explore the turnover and singlecell use of glucose, an amino acid mixture, N-acetylglucosamine (NAG), and protein by gammaproteobacterial clades in coastal waters of the West Antarctic Peninsula in summer and fall. More than 60% of the cells within two closely related gammaproteobacterial clades, Ant4D3 and Arctic96B-16, were active in using the amino acid mixture, protein, and NAG. In contrast, an average of only 7% of all SAR86 cells used amino acids and protein even in summer when DOM use was high. In addition to DOM uptake within a group, we explored the contribution of the three gammaproteobacterial groups to total community uptake of a compound. SAR86 contributed 5-to 10-fold less than the other gammaproteobacterial subgroups to the uptake of all compounds. We found that the overall contribution of the Ant4D3 clade to DOM uptake was highest, whereas the SAR86 clade contributed the least to DOM turnover in West Antarctic Peninsula waters. Our results suggest that the low growth activity of a bacterial clade leads to low abundance, fewer active cells and a low contribution to the turnover of DOM components.A diverse community of heterotrophic bacteria processes dissolved organic material (DOM) in the Arctic Ocean and Antarctic seas, making up a critical part of the carbon cycle in polar environments. Some members of this community appear to be unique to polar waters, while others are also found in low-latitude oceans (1, 2). Single-cell methods have indicated that these bacteria are active in leucine incorporation (3), even though bulk estimates indicate that DOM fluxes mediated by heterotrophic bacteria are lower in polar waters than in other oceans (4). With few exceptions (5-7), however, previous single-cell studies and the bulk activity studies of polar systems have focused on leucine as a general index of bacterial activity (3,(8)(9)(10)(11)(12)(13). The paucity of data about the uptake of other compounds by specific bacterial taxa hinders efforts to understand mechanisms in bacterial biogeography and the contribution of these bacteria to carbon cycling.Studies examining DOM uptake by gammaproteobacteria, which make up 5 to 25% of the total bacterial community in polar systems and many other oceanic waters (14, 15), provide some examples of differences in the uptake of leucine and other DOM components among bacterial clades. Gammaproteobacteria took up more leucine and an amino acid mixture than ATP or glucose in Mediterranean coastal water according to single-cell studies (16,17). Similarly, in the Arctic Ocean, gammaproteobacteria preferred amino acids to other types of low-molecular-weight (LMW) DOM, such as ATP or glucose (5, 6). However, the uptake of protein, algal derivatives, extracellular polysaccharides, and chitin by gammaproteobacteria was higher than their affinity for LMW...

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Multiscale control of bacterial production by phytoplankton dynamics and sea ice along the western Antarctic Peninsula: A regional and decadal investigation

Cited by 77 publications

References 74 publications

Winter and spring controls on the summer food web of the coastal West Antarctic Peninsula

Winter and spring controls on the summer food web of the coastal West Antarctic Peninsula

Effect of continental shelf canyons on phytoplankton biomass and community composition along the western Antarctic Peninsula

Uptake of Dissolved Organic Carbon by Gammaproteobacterial Subgroups in Coastal Waters of the West Antarctic Peninsula

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