Marine copepod assemblages in the Arctic: The effect of frontal zones on biomass and productivity

Dvoretsky, Vladimir G.; Dvoretsky, Alexander G.

doi:10.1016/j.marenvres.2023.106250

Cited by 7 publications

(3 citation statements)

References 52 publications

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“…In the Bering Sea, sea-ice concentration was found to impact secondary production of Calanus spp., which was low during warm periods with less sea-ice cover (Kimmel et al, 2018, Kimmel et al, 2023. In the Barents Sea previous research on secondary production has mainly focused on the southern regions close to the polar front (Basedow et al, 2014;Dvoretsky and Dvoretsky, 2024a) and the eastern Barents Sea (Dvoretsky and Dvoretsky, 2009;Dvoretsky and Dvoretsky, 2024b) and primarily on large Calanus spp. (Slagstad et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Response of the copepod community to interannual differences in sea-ice cover and water masses in the northern Barents Sea

Gawinski,

Daase,

Primicerio

et al. 2024

Front. Mar. Sci.

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The reduction of Arctic summer sea ice due to climate change can lead to increased primary production in parts of the Barents Sea if sufficient nutrients are available. Changes in the timing and magnitude of primary production may have cascading consequences for the zooplankton community and ultimately for higher trophic levels. In Arctic food webs, both small and large copepods are commonly present, but may have different life history strategies and hence different responses to environmental change. We investigated how contrasting summer sea-ice cover and water masses in the northern Barents Sea influenced the copepod community composition and secondary production of small and large copepods along a transect from 76°N to 83°N in August 2018 and August 2019. Bulk abundance, biomass, and secondary production of the total copepod community did not differ significantly between the two years. There were however significant spatial differences in the copepod community composition and production, with declining copepod abundance from Atlantic to Arctic waters and the highest copepod biomass and production on the Barents Sea shelf. The boreal Calanus finmarchicus showed higher abundance, biomass, and secondary production in the year with less sea-ice cover and at locations with a clear Atlantic water signal. Significant differences in the copepod community between areas in the two years could be attributed to interannual differences in sea-ice cover and Atlantic water inflow. Small copepods contributed more to secondary production in areas with no or little sea ice and their production was positively correlated to water temperature and ciliate abundance. Large copepods contributed more to secondary production in areas with extensive sea ice and their production was positively correlated with chlorophyll a concentration. Our results show how pelagic communities might function in a future ice-free Barents Sea, in which the main component of the communities are smaller copepods, and the secondary production they generate is available in energetically less resource-rich portions.

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Section: Introductionmentioning

confidence: 99%

Response of the copepod community to interannual differences in sea-ice cover and water masses in the northern Barents Sea

Gawinski,

Daase,

Primicerio

et al. 2024

Front. Mar. Sci.

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“…(6) The resulting mixture was stored for 20 min and evaporated until complete drying. (7) The dried sample was dissolved in 1 mL of distilled water and centrifuged at 10,000 r.p.m. for 5 min.…”

Section: Biochemical Assaymentioning

confidence: 99%

“…The Barents Sea represents a unique high-latitude Large Marine Ecosystem owing to its high primary productivity and biodiversity [1][2][3] arising from interactions between water masses of disparate origin, namely cold Arctic waters and relatively warmer Arctic waters [4][5][6][7]. This ecosystem sustains major fisheries primarily targeting cod (Gadus morhua), haddock (Melanogrammus aeglefinus), saithe (Pollachius virens), and capelin (Mallotus villosus).…”

Section: Introductionmentioning

confidence: 99%

Amino Acid Composition in Different Tissues of Iceland Scallop from the Barents Sea

Dvoretsky,

Obluchinskaya,

Gorshenina

et al. 2024

Animals

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The Iceland scallop from the Barents Sea is a commercially important species with promising aquaculture potential, but information on the biochemical properties of its tissues is limited. Our analysis of the adductor muscle, gonad, and mantle of this bivalve mollusk from coastal waters provided insight into its amino acid composition. Biochemical analysis revealed predominant levels of glycine (11.8, 11.5, and 9.6 mg g−1, respectively) and arginine (11.2, 8.3, and 5.8 mg g−1, respectively). While multivariate comparisons did not reveal significant differences in amino acid composition between the tissues, single comparisons showed significantly higher levels of arginine and leucine in the adductor muscle compared to those of the mantle. The abundant presence of glycine and arginine underscores their importance in maintaining basic physiological processes, consistent with other scallop species. Redundancy analysis identified water depth and scallop gonad index as influential factors shaping the amino acid profile in the adductor muscle. In the case of the mantle, water temperature emerged as the main driver of amino acid content. Our results confirm the richness of essential amino acids in scallop by-products and highlight their potential for human consumption, production of feed ingredients for farmed animals, and nutraceuticals.

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Environmental control of Arctic marine zooplankton near a large archipelago during the summer season

Dvoretsky,

Moiseev,

Venger

et al. 2025

Continental Shelf Research

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Marine copepod assemblages in the Arctic: The effect of frontal zones on biomass and productivity

Cited by 7 publications

References 52 publications

Response of the copepod community to interannual differences in sea-ice cover and water masses in the northern Barents Sea

Response of the copepod community to interannual differences in sea-ice cover and water masses in the northern Barents Sea

Amino Acid Composition in Different Tissues of Iceland Scallop from the Barents Sea

Environmental control of Arctic marine zooplankton near a large archipelago during the summer season

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