Characteristic of microalgae development in the Sea of Okhotsk in winter and modeling of their annual dynamics in Aniva Bay

Леонов, А. В.; Могильникова, Т. А.; Pishchal’nik, V. M.; Zenkin, O. V.

doi:10.1134/s0097807807020091

Cited by 6 publications

(4 citation statements)

References 3 publications

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“…In particular, T. nordenskioeldii usually dominates the spring phytoplankton bloom in the shelf surface waters of the Sea of Okhotsk with water temperatures of 2-5 • C and salinities of 20-27 (Sorokin and Sorokin, 1999). There is evidence that Thalassiosira is abundant in the eastern coastal waters of Sakhalin Island along the moving path of the drift ice in winter and after ice retreat (Sorokin and Sorokin, 1999;Leonov et al, 2007;Zakharkov et al, 2007). We thus suggest that Thalassiosira could be a common component in the drift ice of the Sea of Okhotsk and they play important roles in the drift ice and seawater in the Sea of Okhotsk during the winter and the ice melt season.…”

Section: Discussionmentioning

confidence: 99%

“…There is a substantial standing stock of ice algae in the Okhotsk Sea ice. Dense ice algal communities have commonly been observed at the bottom of Okhotsk sea ice, especially in spring (Leonov et al, 2007). Chlorophyll a (Chl a) concentrations in the Okhotsk sea ice ranged between 0.2 to 3.5 mg m −2 , and was up to an order of magnitude higher than the under-ice seawater (Granskog et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…The spring blooms usually continue until the end of June in the central areas and mid-July or early August in the colder eastern and northern parts (Sorokin and Sorokin, 1999;Shuntov, 2001). When ice breakup begins in spring, ice algae are rapidly washed out of the ice and dispersed into the water column, causing a significant increase in the downward flux of ice algal cells under the Okhotsk sea ice (Leonov et al, 2007;Hiwatari et al, 2008). Spring phytoplankton communities in coastal southern Okhotsk waters off Hokkaido, Japan can also be directly affected by ice melting.…”

Section: Introductionmentioning

confidence: 99%

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Response to Sea Ice Melt Indicates High Seeding Potential of the Ice Diatom Thalassiosira to Spring Phytoplankton Blooms: A Laboratory Study on an Ice Algal Community From the Sea of Okhotsk

et al. 2020

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Phytoplankton communities in seasonally ice-covered areas are largely affected by ice algae. The Okhotsk Sea is the southernmost sea ice zone in the northern hemisphere with a sizeable seasonal ice cover, thus ice algae of the Okhotsk sea ice have a large potential to seed the early spring bloom. Little is known about the Okhotsk ice algal communities and their seeding effects. We investigated the dynamics of the composition and the photophysiological performances of an Okhotsk ice algal community in a 6day laboratory incubation experiment that simulated the natural ice melt conditions. Centric diatoms, especially Thalassiosira spp., overwhelmingly dominated the ice algal community throughout incubation, whereas pennate diatoms, mostly Navicula and Nitzschia, showed little growth with much higher mortality. The maximum photochemical efficiency of Photosystem II (F v /F m) was the lowest at the beginning of the ice melt, suggesting a suppressed photosynthetic functioning by changes in salinity. The cellular pigment contents decreased by 30% due to osmotic stress, evidenced by deformed plastids under a microscope. The transcript level of the rbcL gene that encodes the large subunit of RubisCO was significantly higher during ice melt and decreased in the no-ice period, suggesting an urgent need for carbon fixation under the melt condition. Full recovery of photosynthesis and growth was also made after complete ice melt. Our results indicated high seeding potential of Thalassiosira to spring blooms owing to their photophysiological plasticity to dynamic salinity changes.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Response to Sea Ice Melt Indicates High Seeding Potential of the Ice Diatom Thalassiosira to Spring Phytoplankton Blooms: A Laboratory Study on an Ice Algal Community From the Sea of Okhotsk

et al. 2020

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“…Phytoplankton biomass, including diatoms, is concentrated in summer over the Sakhalin Shelf at the upper boundary of a thermocline ranging from the surface to 10–15 m depths ( Sorokin & Sorokin, 1999 ; Rutenko & Sosnin, 2014 ; Prants et al, 2017 ). Vertical mixing and down-welling of Sakhalin Shelf waters is prevalent in winter ( Leonov et al, 2007 ). The 40-60 m depth ranges of the Offshore benthos are thus below the high surface concentrations of phytoplankton in summer.…”

Section: Discussionmentioning

confidence: 99%

Ampelisca eschrichtii Krøyer, 1842 (Ampeliscidae) of the Sakhalin Shelf in the Okhotsk Sea starve in summer and feast in winter

Durkina

Chapman

Demchenko

2018

PeerJ

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BackgroundAmpelisca eschrichtii Krøyer, 1842 of the Sakhalin Shelf of the Okhotsk Sea, Far Eastern Russia, comprise the highest known biomass concentration of any amphipod population in the world and are a critically important prey source for western gray whales. Growth and reproduction in this population has not been apparent in summer. However, they are not accessible for sampling in winter to test a previous default conclusion that they grow and reproduce in winter.MethodsWe tested the default winter growth and reproduction hypothesis by detailed comparisons of the brood and gonad development among 40 females and 14 males and brood sizes among females observed since 2002. Our test included six predictions of reproductive synchrony that would be apparent from gonad and brood morphology if active reproduction occurs in summer.ResultsWe found high prevalences of undersized and damaged oocytes, undersized broods, a lack of females brooding fully formed juveniles, atrophied ovaries, and males with mature sperm but lacking fully developed secondary sex morphologies required for pelagic mating. All of these conditions are consistent with trophic stress and starvation.DiscussionThese A. eschrichtii populations therefore appear to starve in summer and to grow and reproduce in winter. The Offshore A. eschrichtii populations occur in summer below water strata bearing high phytoplankton biomasses. These populations are more likely to feed successfully in winter when storms mix phytoplankton to their depths.

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Prey biomass dynamics in gray whale feeding areas adjacent to northeastern Sakhalin (the Sea of Okhotsk), Russia, 2001–2015

Blanchard¹,

Demchenko

Aerts³

et al. 2019

Marine Environmental Research

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Characteristic of microalgae development in the Sea of Okhotsk in winter and modeling of their annual dynamics in Aniva Bay

Cited by 6 publications

References 3 publications

Response to Sea Ice Melt Indicates High Seeding Potential of the Ice Diatom Thalassiosira to Spring Phytoplankton Blooms: A Laboratory Study on an Ice Algal Community From the Sea of Okhotsk

Response to Sea Ice Melt Indicates High Seeding Potential of the Ice Diatom Thalassiosira to Spring Phytoplankton Blooms: A Laboratory Study on an Ice Algal Community From the Sea of Okhotsk

Ampelisca eschrichtii Krøyer, 1842 (Ampeliscidae) of the Sakhalin Shelf in the Okhotsk Sea starve in summer and feast in winter

Prey biomass dynamics in gray whale feeding areas adjacent to northeastern Sakhalin (the Sea of Okhotsk), Russia, 2001–2015

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