2014
DOI: 10.1111/nph.13125
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Gross and net production during the spring bloom along the Western Antarctic Peninsula

Abstract: Summary This study explores some of the physiological mechanisms responsible for high productivity near the shelf in the Western Antarctic Peninsula despite a short growing season and cold temperature. We measured gross and net primary production at Palmer Station during the summer of 2012/2013 via three different techniques: incubation with H218O; incubation with 14CO2; and in situ measurements of O2/Ar and triple oxygen isotope. Additional laboratory experiments were performed with the psychrophilic diatom… Show more

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Cited by 48 publications
(82 citation statements)
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References 59 publications
(87 reference statements)
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“…Our FRRF measurements indeed revealed a high capacity for energy dissipation via NPQ (Table 4), even when compared to relatively high values previously measured in diatom-dominated Arctic phytoplankton assemblages as well as individual diatom and haptophyte strains (McKew et al 2013;Hoppe et al 2015;Schuback et al 2017). Moreover, relatively high temperatures occurring in the incubators may have helped to prevent high-light stress by increasing the turnover rate of carbon fixation relative to electron transport, thereby allowing the Calvin cycle to be a more efficient sink for light energy (Mock and Hoch 2005;Goldman et al 2015). Light effects were, however, also absent during the final sampling, i.e., under the 4.5°C colder temperatures compared to the measurement before the first dilution (Online Resource 1).…”
Section: Light-dependent Responses Were Subtle and Disappeared Duringmentioning
confidence: 92%
“…Our FRRF measurements indeed revealed a high capacity for energy dissipation via NPQ (Table 4), even when compared to relatively high values previously measured in diatom-dominated Arctic phytoplankton assemblages as well as individual diatom and haptophyte strains (McKew et al 2013;Hoppe et al 2015;Schuback et al 2017). Moreover, relatively high temperatures occurring in the incubators may have helped to prevent high-light stress by increasing the turnover rate of carbon fixation relative to electron transport, thereby allowing the Calvin cycle to be a more efficient sink for light energy (Mock and Hoch 2005;Goldman et al 2015). Light effects were, however, also absent during the final sampling, i.e., under the 4.5°C colder temperatures compared to the measurement before the first dilution (Online Resource 1).…”
Section: Light-dependent Responses Were Subtle and Disappeared Duringmentioning
confidence: 92%
“…In nutrient rich Antarctic coastal waters their blooms can reach concentrations approaching 10 8 cells l −1 . Chlorophyll a (Chl a) concentrations as high as 50 µg l −1 have been recorded off the West Antarctic Peninsula (WAP), although maximum Chl a concentrations off East Antarctica are usually an order of magnitude less (Nelson et al, 1987;Smith and Gordon, 1997;Wright and van den Enden, 2000;Garibotti et al, 2003;Wright et al, 2010;Goldman et al, 2015). The majority of phytoplankton production in the SO is grazed by microheterotrophs or consumed and remineralized by bacteria (Lochte et al, 1997;Christaki et al, 2014).…”
Section: Introductionmentioning
confidence: 99%
“…Biogeochemical time-series observations resolving seasonal changes in productivity are particularly scarce in the Arctic (MacGilchrist et al, 2014;Stanley et al, 2015). Measurements at Palmer Station in Antarctica show a strong seasonality in biological productivity and carbon uptake associated with changes in light, physical mixing, and grazing and demonstrate the benefits of high-frequency sampling for quantifying CO 2 uptake (Ducklow et al, 2013;Tortell et al, 2014;Goldman et al, 2015). Parameterization of gas exchange in the presence of ice also remains highly uncertain.…”
Section: Introductionmentioning
confidence: 99%
“…To our knowledge, this study is the first field-based experiment where the dual tracer technique is conducted in the presence of ice, and it adds to a limited number of in situ measurements of NOP and GOP during ice melt (Goldman et al, 2015;Stanley et al, 2015;Eveleth et al, 2016).…”
Section: Introductionmentioning
confidence: 99%