Organic matter pathways to zooplankton and benthos under pack ice in late winter and open water in late summer in the north-central Bering Sea

Lovvorn, James R.; Cooper, Lee W.; Brooks, Marjorie L.; Ruyck, Christopher C. De; Bump, Joseph K.; Grebmeier, Jacqueline M.

doi:10.3354/meps291135

Cited by 123 publications

(99 citation statements)

References 132 publications

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“…OCs not detected (n.d.) are indicated for the bivalve species. C-values show food associated with settling, pelagic phytoplankton (Lovvorn et al, 2005;Søreide et al, 2006a Søreide et al, 2006a), which is reflected in the isotopic values of the bivalves . During the year of sampling, Kongsfjorden had very limited sea ice coverage, whereas the sea ice in Liefdefjorden retreated just 2.5 weeks before the sampling of bivalves.…”

Section: Oc Differences Among Speciesmentioning

confidence: 99%

“…Accordingly, ice algae were an unlikely food source for the bivalves in Kongsfjorden. Higher C of POM have been shown to change due to degradation processes such as grazing on settling POM or bacterial degradation of deposited POM when it reaches the sea floor (Lehmann et al, 2002;Lovvorn et al, 2005). Furthermore, stable isotope analyses showed also different d 15 N-values among the species, revealing a higher trophic level for C. islandica compared to the other species.…”

Section: Oc Differences Among Speciesmentioning

confidence: 99%

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Persistent organic pollutants in four bivalve species from Svalbard waters

Vieweg

Hop

Brey

et al. 2012

Environmental Pollution

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a b s t r a c tOrganochlorine compounds (OC) were determined in Arctic bivalves (Mya truncata, Serripes groenlandicus, Hiatella arctica and Chlamys islandica) from Svalbard with regard to differences in geographic location, species and variations related to their size and age. Higher chlorinated polychlorinated biphenyls (PCB 101ePCB 194), chlordanes and a-hexachlorocyclohexane (a-HCH) were consistently detected in the bivalves and PCBs dominated the OC load in the organisms. OC concentrations were highest in Mya truncata and the lowest in Serripes groenlandicus. Species-specific OC levels were likely related to differences in the species' food source, as indicated by the d 13 C results, rather than size and age.Higher OC concentrations were observed in bivalves from Kongsfjorden compared to the northern sampling locations Liefdefjorden and Sjuøyane. The spatial differences might be related to different water masses influencing Kongsfjorden (Atlantic) and the northern locations (Arctic), with differing phytoplankton bloom situations.

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Section: Oc Differences Among Speciesmentioning

confidence: 99%

Section: Oc Differences Among Speciesmentioning

confidence: 99%

Persistent organic pollutants in four bivalve species from Svalbard waters

Vieweg

Hop

Brey

et al. 2012

Environmental Pollution

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“…This fosters an intense bloom at the ice edge. However, following ice retreat, wind mixing is sometimes sufficient to break down the density stratification imparted by the fresh meltwater (e.g., Lovvorn et al, 2005;Niebauer et al, 1990Niebauer et al, , 1995 and limit continued open water PP. The second phase of PP occurs when solar radiation stabilizes the water column enough to support an open-water bloom.…”

Section: Other Physical and Biogeochemical Controls On Ppmentioning

confidence: 99%

Seasonal distribution of dissolved inorganic carbon and net community production on the Bering Sea shelf

et al. 2010

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Abstract. In order to assess the current state of net community production (NCP) in the southeastern Bering Sea, we measured the spatio-temporal distribution and controls on dissolved inorganic carbon (DIC) concentrations in spring and summer of 2008 across six shelf domains defined by differing biogeochemical characteristics. DIC concentrations were tightly coupled to salinity in spring and ranged from ∼1900 µmoles kg −1 over the inner shelf to ∼2400 µmoles kg −1 in the deeper waters of the Bering Sea. In summer, DIC concentrations were lower due to dilution from sea ice melt, terrestrial inputs, and primary production. Concentrations were found to be as low ∼1800 µmoles kg −1 over the inner shelf. We found that DIC concentrations were drawn down 30-150 µmoles kg −1 in the upper 30 m of the water column due to primary production and calcium carbonate formation between the spring and summer occupations. Using the seasonal drawdown of DIC, estimated rates of NCP on the inner, middle, and outer shelf averaged 28 ± 9 mmoles C m −2 d −1 . However, higher rates of NCP (40-47 mmoles C m −2 d −1 ) were observed in the "Green Belt" where the greatest confluence of nutrient-rich basin water and iron-rich shelf water occurs. We estimated that in 2008, total NCP across the shelf was on the order of ∼96 Tg C yr −1 . Due to the paucity of consistent, comparable productivity data, it is impossible at this time to quantify whether the system is becoming more or less productive. However, as changing climate continues to modify the character of the Bering Sea, we have shown that NCP can be an important indicator of how the ecosystem is functioning.

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“…Those consumers include deposit-feeding Holothuroidea Molpadia musculus and Ypsilocucumis turricata (d 13 C = -18.35 ± 0.87 % and -18.88 ± 0.28 %, respectively; Mincks et al 2008) and suspension-feeding Anthozoa (d 13 C up to -16 %; Nyssen et al 2002). Important 13 C enrichment of benthic consumers, including bivalves and sea urchins, has also been recorded in Arctic ecosystems (Hobson and Welch 1992;Lovvorn et al 2005). This phenomenon is usually linked with direct or indirect assimilation of detrital organic material reworked by sediment microorganisms and/or meiofauna.…”

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confidence: 99%

Trophic plasticity of Antarctic echinoids under contrasted environmental conditions

et al. 2015

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Echinoids are common members of Antarctic zoobenthos, and different groups can show important trophic diversity. As part of the ANT-XXIX/3 cruise of RV Polarstern, trophic plasticity of sea urchins was studied in three neighbouring regions (Drake Passage, Bransfield Strait and Weddell Sea) featuring several depth-related habitats offering different trophic environments to benthic consumers. Three families with contrasting feeding habits (Cidaridae, Echinidae and Schizasteridae) were studied. Gut content examination and stable isotopes ratios of C and N suggest that each of the studied families showed a different response to variation in environmental and food conditions. Schizasteridae trophic plasticity was low, and these sea urchins were bulk sediment feeders relying on sediment-associated organic matter in all regions and/or depth-related habitats. Cidaridae consumed the most animal-derived material. Their diet varied according to the considered area, as sea urchins from Bransfield Strait relied mostly on living and/or dead animal material, while specimens from Weddell Sea fed on a mixture of dead animal material and other detritus. Echinidae also showed important trophic plasticity. They fed on various detrital items in Bransfield Strait, and selectivity of ingested material varied across depth-related habitats. In Weddell Sea, stable isotopes revealed that they mostly relied on highly 13 C-enriched food items, presumably microbially reworked benthic detritus. The differences in adaptive strategies could lead to family-specific responses of Antarctic echinoids to environmental and food-related changes.

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Organic matter pathways to zooplankton and benthos under pack ice in late winter and open water in late summer in the north-central Bering Sea

Cited by 123 publications

References 132 publications

Persistent organic pollutants in four bivalve species from Svalbard waters

Persistent organic pollutants in four bivalve species from Svalbard waters

Seasonal distribution of dissolved inorganic carbon and net community production on the Bering Sea shelf

Trophic plasticity of Antarctic echinoids under contrasted environmental conditions

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