Contrasting summer phytoplankton communities in stratified and mixed waters of the white sea

Ilyash, L. V.; Radchenko, I. G.; Шевченко, В. П.; Здоровеннов, Роман; Pantyulin, A. N.

doi:10.1134/s0001437014050075

Cited by 6 publications

(4 citation statements)

References 15 publications

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“…2, 4, 10, 13 and 17); meanwhile, the water stratification was absent at the stations located in cen tral Onega Bay and the nearby Solovetsky Archipelago (station nos. 6,8,20,22, and 53) (Fig. 1).…”

Section: Resultsmentioning

confidence: 87%

“…It can form intensive blooms that in most cases correspond to SWs and a low salinity surface layer [18]. Earlier, the predominance of P. minimum was recorded in MWs in central Onega Bay (early July 2008); its abundance was 48 × 10 6 cells/m 3 , and the biomass was 15 mg C/m 3 [6]. Therefore, the new data make it possible to consider that P. minimum may have a high abundance both in MWs and in SWs in the White Sea, which is in accordance with data on its distribution in other marine ecosystems [18,33].…”

Section: Discussionmentioning

confidence: 99%

“…In Onega Bay, vertically homog enous waters (due to tide mixing) are common in Solovetsky Salmas (straits belonging to the Solovetsky Archipelago) and the central part of the bay [6,7]. In southeastern Onega Bay, the water column is stratified due to the decrease in water salinity in the surface layer resulted from discharge of the Onega River.…”

Section: Introductionmentioning

confidence: 98%

“…Water masses with different hydrophysical parameters are separated by the frontal zone, whose position can change at least once a week [7]. The spatial heteroge neity of phytoplankton with respect to the hydrophys ical conditions has been analyzed for some areas of the White Sea [5,6]; however, most of Onega Bay and the inlets of Kandalaksha Bay have not been studied pre viously. There have been no data on such an important phytoplankton component as picoplankton for Onega Bay until now; picoplankton comprises cyano bacteria and eukaryotic microalgae less than 2 µm in size [38], or, according to some later publications, less than 3 µm [29].…”

Section: Introductionmentioning

confidence: 99%

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Effects of local hydrophysical conditions on the spatial variability of phytoplankton in the White Sea

et al. 2015

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The species composition and biomass of phytoplankton, chlorophyll a concentration (Chl), and hydrophysical characteristics of water masses have been studied in Onega and Kandalaksha bays (Chupa Inlet and Knyazhaya Inlet) of the White Sea at 16 stations June 17-26, 2012. Structural analysis of the phytoplank ton community according to the Bray-Curtis similarity index has revealed two groups of stations. The first group united stations in stratified waters in Kandalaksha Bay; all stations located in Onega Bay formed another group. In turn, the stations in Onega Bay were separated into two subgroups corresponding to mixed (MWs) and stratified (SWs) waters. The total phytoplankton biomass and the biomass of diatoms and small unidentified flagellates were higher in Onega Bay. The biomass of dinoflagellates and cryptophytes, as well as Chl, did not differ significantly in Kandalaksha and Onega bays. In Onega Bay, the total phytoplankton bio mass, Chl, and contribution of dinoflagellates to the total biomass were higher in SWs than in MWs. The con tribution of diatoms was higher in SWs. The study addresses the role of the frontal zones in shaping the struc ture and distribution of the phytoplankton community.

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Section: Resultsmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Effects of local hydrophysical conditions on the spatial variability of phytoplankton in the White Sea

et al. 2015

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Phytoplankton of the White Sea

Ilyash

Белевич

Житина

et al. 2018

The Handbook of Environmental Chemistry

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Molecular diversity patterns among various phytoplankton size-fractions in West Greenland in late summer

Elferink

Neuhaus

Wohlrab

et al. 2017

Deep Sea Research Part I: Oceanographic Research Papers

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Arctic regions have experienced pronounced biological and biophysical transformations as a result of global change processes over the last several decades. Current hypotheses propose an elevated impact of those environmental changes on the biodiversity, community composition and metabolic processes of species. The effects on ecosystem function and services, particularly when invasive or toxigenic harmful species become dominant, can be expressed over a wide range of temporal and spatial scales in plankton communities. Our study focused on the comparison of molecular biodiversity of three size-fractions (micro-, nano-, picoplankton) in the coastal pelagic zone of West Greenland and their association with environmental parameters. Molecular diversity was assessed via parallel amplicon sequencing the 28S rRNA hypervariable D1/D2 region. We showed that biodiversity distribution within the area of Uummannaq Fjord, Vaigat Strait and Disko Bay differed markedly within and among size-fractions. In general, we observed a higher diversity within the picoplankton size fraction compared to the nano-and microplankton. In multidimensional scaling analysis, community composition of all three size fractions correlated with cell size, silicate and phosphate, chlorophyll a (chl a) and dinophysistoxin (DTX). Individually, each size fraction community composition also correlated with other different environmental parameters, i.e. temperature and nitrate. We observed a more homogeneous community of the picoplankton across all stations compared to the larger size classes, despite different prevailing environmental conditions of the sampling areas. This suggests that habitat niche occupation for larger-celled species may lead to higher functional trait plasticity expressed as an enhanced range of phenotypes, whereas smaller organisms may compensate for lower potential plasticity with higher diversity. The presence of recently identified toxigenic harmful algal bloom (HAB) species (such as Alexandrium fundyense and A. ostenfeldii) in the area points out the potential risk for this vulnerable ecosystem in a changing world.

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Contrasting summer phytoplankton communities in stratified and mixed waters of the white sea

Cited by 6 publications

References 15 publications

Effects of local hydrophysical conditions on the spatial variability of phytoplankton in the White Sea

Effects of local hydrophysical conditions on the spatial variability of phytoplankton in the White Sea

Phytoplankton of the White Sea

Molecular diversity patterns among various phytoplankton size-fractions in West Greenland in late summer

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