Distribution and Feeding of Herbivorous Zooplankton in the Laptev Sea

Арашкевич, Е. Г.; Drits, A. V.; Pasternak, A. F.; Флинт, М. В.; Демидов, А. Б.; Amelina, A. B.; Кравчишина, М. Д.; Sukhanova, I. N.; Щука, С. А.

doi:10.1134/s0001437018030013

Cited by 13 publications

(7 citation statements)

References 24 publications

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“…Zooplankton fecal pellets flux was rather similar at the studied sites and depths and contributed only a small fraction to the vertical POC flux (5% on average), suggesting that the river plume did not produce a significant impact on the FPs flux. Similarly, no effect of the Lena River plume on zooplankton grazing was found (Arashkevich et al., 2018).…”

Section: Discussionmentioning

confidence: 97%

“…Our data describe particle sedimentation at the end of the productive season when river inflow is moderate (Janout et al., 2020), radiation rapidly declines, primary production and phytoplankton biomass decrease (Demidov et al., 2019), and zooplankton biomass and grazing were low (Arashkevich et al., 2018). Given the scarcity of data for this region, our study provides new insights into the magnitude and composition of the sinking fluxes on the shelf of the Laptev Sea in habitats differentially influenced by the river plumes during the ice‐free period.…”

Section: Discussionmentioning

confidence: 97%

“…Higher grazing is usually connected with an earlier stage of succession (Juul‐Pedersen et al., 2008; Wexels Riser et al., 2010). The contribution of FP to POC bio flux was relatively low in both of the years (2%–33%) which is likely explained by the reduced feeding activity of the pelagic community at the tail end of the productive season (Arashkevich et al., 2018). Similar estimates of FP impact on the organic carbon export were obtained in the Beaufort Sea: from a few to 25 percent (Miguel et al., 2015) and from 2% to 11% (Juul‐Pedersen et al., 2008) in the autumn.…”

Section: Discussionmentioning

confidence: 99%

“…Similarly, no effect of the Lena River plume on zooplankton grazing was found (Arashkevich et al, 2018).…”

Section: Vertical Flux and Freshwater Plumementioning

confidence: 92%

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Influence of Riverine Discharge and Timing of Ice Retreat on Particle Sedimentation Patterns on the Laptev Sea Shelf

et al. 2021

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The export of organic carbon from the surface to deep-sea layers, resulting from sedimentation of particulate organic matter, is one of the main processes of the global carbon cycle in the ocean and a key factor in regulating the level of CO 2 in the atmosphere (Archer et al., 2000;Siegenthaler et al., 2005). Recently, the processes of sedimentation of matter and the functioning of the "biological pump" in the Arctic have attracted great attention, since in this region the current climate changes are most pronounced (Walsh, 2008). The dynamics of the vertical flux of sedimentary matter and, to a lesser extent, its composition, have been studied in various marine ecosystems of the Arctic Basin over the past decades (

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

“…Similarly, no effect of the Lena River plume on zooplankton grazing was found (Arashkevich et al, 2018).…”

Section: Vertical Flux and Freshwater Plumementioning

confidence: 92%

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Influence of Riverine Discharge and Timing of Ice Retreat on Particle Sedimentation Patterns on the Laptev Sea Shelf

et al. 2021

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“…The acoustic data from the single-frequency ADCP do not provide any information on the identity of organisms responsible for the observed DVM patterns. Among the zooplankton species abundant in the research area, only late copepodite stages of large-sized copepods Calanus glacialis and Metridia longa (total body length 2.0-5.0 mm) are known to perform DVM in the Laptev and Kara seas (Arashkevich et al, 2018). However, these species migrate to deeper regions from October to March, and were most likely absent from the study area.…”

Section: Zooplankton Diel Vertical Migration During Spring and Fallmentioning

confidence: 99%

Coastal Polynya Disrupts the Acoustic Backscatter Diurnal Signal Over the Eastern Laptev Sea Shelf

et al. 2021

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The diel vertical migration (DVM) of zooplankton is one of the largest species migrations to occur globally and is a key driver of regional ecosystems and the marine carbon pump. The dramatic changes in the Arctic environment in recent years, mainly associated with sea-ice decline, may have wide significance for the Arctic shelf ecosystems including DVM. Observations have revealed the occurrence of DVM in ice-covered Arctic waters, however, there have yet to be observations of DVM from the extensive Siberian shelves in the Eurasian Arctic and no analysis of how the sea-ice decline may affect DVM. Here, 2 yearlong time series of acoustic backscatter, collected by moored acoustic Doppler current profilers in the eastern Laptev Sea from August 1998 to August 1999, were used to examine the annual cycle of acoustic scattering, and therefore the annual cycle of DVM in the area. The acoustic time series were used along with atmospheric and oceanic reanalysis and satellite data. Our observations show that DVM did not occur during polar night and polar day, but is active during the spring and fall transition periods when there is a diurnal cycle in light conditions. DVM began beneath the fast ice at the end of polar night and increased in intensity through spring. However, the formation of a large polynya along the landfast ice edge in late March 1999 caused DVM to abruptly cease near the fast ice edge, while DVM persisted through spring to the start of polar day at the onshore mooring. We associate this cessation of synchronized DVM ∼1 month ahead of polar day with a predator-avoidance behavior of zooplankton in response to higher polar cod abundance near the polynya. During polar day, the intensity of acoustic scattering was attributed to the riverine suspended particles. Overall, our results highlight the occurrence of DVM on the Siberian shelves, the cessation of synchronized DVM when a polynya opens up nearby, and the potential impact of significant trends toward a more extensive Laptev Sea polynya as part of changing ice conditions in the Eurasian Arctic and their impact on the Arctic shelf ecology.

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Cross-shelf structure and distribution of mesozooplankton communities in the East-Siberian Sea and the adjacent Arctic Ocean

Ershova

Kosobokova

2019

Polar Biol

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Distribution and Feeding of Herbivorous Zooplankton in the Laptev Sea

Cited by 13 publications

References 24 publications

Influence of Riverine Discharge and Timing of Ice Retreat on Particle Sedimentation Patterns on the Laptev Sea Shelf

Influence of Riverine Discharge and Timing of Ice Retreat on Particle Sedimentation Patterns on the Laptev Sea Shelf

Coastal Polynya Disrupts the Acoustic Backscatter Diurnal Signal Over the Eastern Laptev Sea Shelf

Cross-shelf structure and distribution of mesozooplankton communities in the East-Siberian Sea and the adjacent Arctic Ocean

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