Contribution of algal sinking and zooplankton grazing to downward flux in the Lazarev Sea (Southern Ocean) during the onset of phytoplankton bloom: a lagrangian study

Pakhomov, Evgeny A.; Froneman, P. W.; Wassmann, Paul; Ratkova, Tatjana; Арашкевич, Е. Г.

doi:10.3354/meps233073

Cited by 28 publications

(12 citation statements)

References 48 publications

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“…Downward flux was positively correlated with biomass of large cells, data from both reservoirs combined, in accordance with the initial hypothesis that large cells contribute more to sedimentation in reservoirs than other size classes. Pakhomov et al. (2002) also found that microphytoplankton (20–200 μ m) represents 15–75% of the total fluxes of particulate organic carbon, with highest values in periods of bloom.…”

Section: Discussionmentioning

confidence: 85%

Short‐term variability in physical forcing in temperate reservoirs: effects on phytoplankton dynamics and sedimentary fluxes

2006

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1. The effects of wind events on phytoplankton dynamics were investigated in two temperate reservoirs. 2. Meteorological forcing, change in physical and chemical structure of the water column and biological responses of phytoplankton communities were followed for 3 weeks in three seasons. 3. Depending on the season, the phytoplankton response differed in response to nutrient and light conditions, and to the intensity of stratification and mixing. 4. We demonstrated that, on a time scale of a few days, wind events can modify phytoplankton dynamics, in terms of size structure and exported biomass. An increase of mixing favoured the largest size class and disadvantaged the smallest size class, while an increase in stratification had the opposite effects. The short-term change in size structure was reflected in the sedimentary fluxes but with a time lag.

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Section: Discussionmentioning

confidence: 85%

Short‐term variability in physical forcing in temperate reservoirs: effects on phytoplankton dynamics and sedimentary fluxes

2006

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“…A few published studies exist where Phaeocystis PPC as a fraction of POC has been quantified Gowing et al 2001;Olli et al 2002;Pakhomov et al 2002). Compiling these data with some previously unpublished data from investigations carried out by Wassmann and co-workers in Tromsø, Norway, provides Average ± standard deviation of three sampling events.…”

Section: The Morphological Challenge: Cells and Coloniesmentioning

confidence: 90%

Does Phaeocystis spp. contribute significantly to vertical export of organic carbon?

Reigstad

Wassmann

2007

Biogeochemistry

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Phaeocystis spp. cell and colony mass fluxes and their contribution to the vertical particulate organic carbon (POC) export from a wide range of stations were quantified by shortterm sediment traps. The compilation of available data, ranging from polar to sub-arctic and boreal regions, revealed that Phaeocystis colonial and single cells frequently are observed in shallow sediment traps at 30-50 m depth (average of 7 ± 11% of POC export). A strong vertical export decline between 40 m and 100 m diminished the contribution of Phaeocystis spp. cell carbon to vertical export of POC to only 3 ± 2% at 100 m depth, with two exceptions (deeper mixed stations). Estimates of potential corresponding mucus contribution increased the average Phaeocystis spp. contribution to <5% of POC export. The vertical flux attenuation efficiency is higher for Phaeocystis spp. than for diatoms. The overall contribution of Phaeocystis spp. to vertical carbon export based on direct investigations of vertical organic carbon export is small.

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“…These pelagic gastropods are found throughout the world, predominantly in near-surface seawater, although deep-sea species are also known to exist (Lalli and Gilmer, 1989). Studies of the potential effects of ocean acidification on pteropods have primarily focused on polar species because of their abundance and importance in regional foodwebs and carbon biogeochemical cycles (Pakhomov et al, 2002;Accornero et al, 2003;Armstrong et al, 2005;Manno et al, 2010) and because the polar oceans are expected to reach undersaturation first due to the increased solubility of CO 2 in cold water (Comeau et al, 2011). The Arctic species Limacina helicina shows a 28 % decrease in calcification at 780 ppm CO 2 , although it is capable of precipitating aragonite at low saturation states (Comeau et al, 2009(Comeau et al, , 2010a.…”

Section: Introductionmentioning

confidence: 99%

The metabolic response of pteropods to acidification reflects natural CO<sub>2</sub>-exposure in oxygen minimum zones

2012

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Abstract. Shelled pteropods (Thecosomata) are a group of holoplanktonic mollusks that are believed to be especially sensitive to ocean acidification because their aragonitic shells are highly soluble. Despite this concern, there is very little known about the physiological response of these animals to conditions of elevated carbon dioxide. This study examines the oxygen consumption and ammonia excretion of five pteropod species, collected from tropical regions of the Pacific Ocean, to elevated levels of carbon dioxide (0.10 %, 1000 ppm). Our results show that pteropods that naturally migrate into oxygen minimum zones, such as Hyalocylis striata, Clio pyramidata, Cavolinia longirostris and Creseis virgula, were not affected by carbon dioxide at the levels and duration tested. Diacria quadridentata, which does not migrate, responds to high carbon dioxide conditions with reduced oxygen consumption and ammonia excretion. This indicates that the natural chemical environment of individual species may influence their resilience to ocean acidification.

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Contribution of algal sinking and zooplankton grazing to downward flux in the Lazarev Sea (Southern Ocean) during the onset of phytoplankton bloom: a lagrangian study

Cited by 28 publications

References 48 publications

Short‐term variability in physical forcing in temperate reservoirs: effects on phytoplankton dynamics and sedimentary fluxes

Short‐term variability in physical forcing in temperate reservoirs: effects on phytoplankton dynamics and sedimentary fluxes

Does Phaeocystis spp. contribute significantly to vertical export of organic carbon?

The metabolic response of pteropods to acidification reflects natural CO<sub>2</sub>-exposure in oxygen minimum zones

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Contribution of algal sinking and zooplankton grazing to downward flux in the Lazarev Sea (Southern Ocean) during the onset of phytoplankton bloom: a lagrangian study

Cited by 28 publications

References 48 publications

Short‐term variability in physical forcing in temperate reservoirs: effects on phytoplankton dynamics and sedimentary fluxes

Short‐term variability in physical forcing in temperate reservoirs: effects on phytoplankton dynamics and sedimentary fluxes

Does Phaeocystis spp. contribute significantly to vertical export of organic carbon?

The metabolic response of pteropods to acidification reflects natural CO&lt;sub&gt;2&lt;/sub&gt;-exposure in oxygen minimum zones

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The metabolic response of pteropods to acidification reflects natural CO<sub>2</sub>-exposure in oxygen minimum zones