Methane as an Organic Matter Source and the Trophic Basis of a Laptev Sea Cold Seep Microbial Community

Savvichev, Alexander S; Kadnikov, V. V.; Кравчишина, М. Д.; Galkin, Sergey; Новигатский, А Н; Sigalevich, Pavel; Merkel, Alexander Y.; Ravin, Nikolai V.; Пименов, Н. В.; Флинт, М. В.

doi:10.1080/01490451.2017.1382612

Cited by 40 publications

(32 citation statements)

References 53 publications

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“…Other studies targeting the symbionts of these animals were, however, more equivocal. Unlike Savvichev et al (2018), Lösekann et al (2008 and Sen et al (2018b) only observed SOB in TEM images of Oligo brachia haakonmosbiensis from HMMV, and in Oligo brachia sp. CPL-clade from GHM and the Crater area, respectively.…”

Section: Seep-associated Food Webs: Carbon Sources and Trophic Structurementioning

confidence: 84%

“…With respect to Arctic siboglinids, published δ 13 C signatures from Oligobrachia frenulates suggest the involvement of methanotrophic symbionts because of the characteristically low δ 13 C signatures observed among them (~−50 to −62 ‰; Gebruk et al 2003, Decker & Olu 2012, Paull et al 2015). Furthermore, Savvichev et al (2018) observed methanotrophs in Oligobrachia frenualtes from the Laptev Sea in transmission electron microscope (TEM) images. Other studies targeting the symbionts of these animals were, however, more equivocal.…”

Section: Seep-associated Food Webs: Carbon Sources and Trophic Structurementioning

confidence: 99%

“…The genus Oligobrachia has been observed at all other Arctic and North Atlantic seep sites studied to date (e.g. Gebruk et al 2003, Savvichev et al 2018, Sen et al 2018b and is hypothesized to be the most widespread siboglinid among seeps on the Arctic shelf. The presence/absence of specific extant frenulate species is likely influenced by environmental characteristics such as substrate, depth, and concentrations and fluxes of sulfide/ methane in the sediment (Southward et al 1986, Dando et al 2008, Sen et al 2018a.…”

Section: Arctic Cold Seep Faunamentioning

confidence: 99%

“…Cold seeps occur in all the world's oceans (Sibuet & Olu 1998, Vanreusel et al 2009, Levin et al 2016, including the Arctic , Paull et al 2015, Savvichev et al 2018. Natural methane seeps have also been found in the Barents Sea, around the Svalbard archipelago, where gas seepage likely results from the dissolution of hydrate reservoirs in the sub-seabed caused by post-glacial isostatic re bound from the last glacial maximum (LGM) (Portnov et al 2016 and tectonic stress (Plaza-Faverola & Keiding 2019).…”

Section: Introductionmentioning

confidence: 99%

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Chemosynthesis influences food web and community structure in high-Arctic benthos

Åström¹,

Carroll²,

Sen³

et al. 2019

Mar. Ecol. Prog. Ser.

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Cold seeps are locations where seafloor communities are influenced by the seepage of methane and other reduced compounds from the seabed. We examined macro-infaunal benthos through community analysis and trophic structure using stable isotope analysis at 3 seep locations in the Barents Sea. These seeps were characterized by high densities of the chemosymbiotic polychaetes Siboglinidae, clade Frenulata (up to 32 120 ind. m −2), and thyasirid bivalves, Mendicula cf. pygmaea (up to 4770 ind. m −2). We detected low δ 13 C signatures in chemosymbiotic polychaetes and in 3 species of omnivorous/predatory polychaetes. These δ 13 C signatures indicate the input of chemosynthesis-based carbon (CBC) into the food web. Applying a 2-source mixing model, we demonstrated that 28−41% of the nutrition of non-chemosymbiotic polychaetes originates from CBC. We also documented large community variations and small-scale variability within and among the investigated seeps, showing that the impact of seepage on faunal community structure transcends geographic boundaries within the Barents Sea. Moreover, aggregations of heterotrophic macro-and megafauna associated with characteristic seep features (microbial mats, carbonate outcrops, and chemosymbiotic worm-tufts) add 3-dimensional structure and habitat complexity to the seafloor. Cold seeps contribute to the hydrocarbon-derived chemoautotrophy component of these ecosystems and to habitat complexity. These characteristics make the cold seeps of potential high ecological relevance in the functioning of the larger Arctic−Barents Sea ecosystem.

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Section: Seep-associated Food Webs: Carbon Sources and Trophic Structurementioning

confidence: 84%

Section: Seep-associated Food Webs: Carbon Sources and Trophic Structurementioning

confidence: 99%

Section: Arctic Cold Seep Faunamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Chemosynthesis influences food web and community structure in high-Arctic benthos

Åström¹,

Carroll²,

Sen³

et al. 2019

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

show abstract

“…In contrast to PKF, the shallow (70 m) Laptev Sea site shares a number of characteristic fauna with other Arctic seeps, including the high dominance of siboglinid worms (Åström et al, 2016;Demina and Galkin, 2018). Hence, for the Laptev Sea seep, depth alone is not an environmental barrier to exclude the presence of siboglinids (Demina and Galkin, 2018;Savvichev et al, 2018).…”

Section: Siboglinids At Arctic Seepsmentioning

confidence: 95%

Cold Seeps in a Warming Arctic: Insights for Benthic Ecology

et al. 2020

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Cold-seep benthic communities in the Arctic exist at the nexus of two extreme environments; one reflecting the harsh physical extremes of the Arctic environment and another reflecting the chemical extremes and strong environmental gradients associated with seafloor seepage of methane and toxic sulfide-enriched sediments. Recent ecological investigations of cold seeps at numerous locations on the margins of the Arctic Ocean basin reveal that seabed seepage of reduced gas and fluids strongly influence benthic communities and associated marine ecosystems. These Arctic seep communities are mostly different from both conventional Arctic benthic communities as well as cold-seep systems elsewhere in the world. They are characterized by a lack of large specialized chemo-obligate polychetes and mollusks often seen at non-Arctic seeps, but, nonetheless, have substantially higher benthic abundance and biomass compared to adjacent Arctic areas lacking seeps. Arctic seep communities are dominated by expansive tufts or meadows of siboglinid polychetes, which can reach densities up to >3 × 10 5 ind.m −2. The enhanced autochthonous chemosynthetic production, combined with reef-like structures from methane-derived authigenic carbonates, provides a rich and complex local habitat that results in aggregations of non-seep specialized fauna from multiple trophic levels, including several commercial species. Cold seeps are far more widespread in the Arctic than thought even a few years ago. They exhibit in situ benthic chemosynthetic production cycles that operate on different spatial and temporal cycles than the sunlight-driven counterpart of photosynthetic production in the ocean's surface. These systems can act as a spatio-temporal bridge for benthic communities and associated ecosystems that may otherwise suffer from a lack of consistency in food quality from the surface ocean during seasons of low production. As climate change impacts accelerate in Arctic marginal seas, photosynthetic primary production cycles are being modified, including in terms of changes in the timing, magnitude, and quality of photosynthetic carbon, whose delivery to the seabed fuels benthic communities. Furthermore, an increased northward expansion of species is expected as a consequence of warming seas. This may have implications for dispersal and evolution of both chemosymbiotic species as well as for background taxa in the entire realm of the Arctic Ocean basin and fringing seas.

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Frenulate siboglinids at high Arctic methane seeps and insight into high latitude frenulate distribution

Sen

Didriksen

Hourdez

et al. 2020

Ecology and Evolution

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Frenulate species were identified from a high Arctic methane seep area on Vestnesa Ridge, western Svalbard margin (79°N, Fram Strait) based on mitochondrial cytochrome oxidase subunit I (mtCOI). Two species were found: Oligobrachia haakonmosbiensis, and a new, distinct, and undescribed Oligobrachia species. The new species adds to the cryptic Oligobrachia species complex found at high latitude methane seeps in the north Atlantic and the Arctic. However, this species displays a curled tube morphology and light brown coloration that could serve to distinguish it from other members of the complex. A number of single tentacle individuals were recovered which were initially thought to be members of the only unitentaculate genus, Siboglinum. However, sequencing revealed them to be the new species and the single tentacle morphology, in addition to thin, colorless, and ringless tubes indicate that they are juveniles. This is the first known report of juveniles of northern Oligobrachia. Since the juveniles all appeared to be at about the same developmental stage, it is possible that reproduction is either synchronized within the species, or that despite continuous reproduction, settlement, and growth in the sediment only takes place at specific periods. The new find of the well‐known species O. haakonmosbiensis extends its range from the Norwegian Sea to high latitudes of the Arctic in the Fram Strait. We suggest bottom currents serve as the main distribution mechanism for high latitude Oligobrachia species and that water depth constitutes a major dispersal barrier. This explains the lack of overlap between the distributions of northern Oligobrachia species despite exposure to similar current regimes. Our results point toward a single speciation event within the Oligobrachia clade, and we suggest that this occurred in the late Neogene, when topographical changes occurred and exchanges between Arctic and North Atlantic water masses and subsequent thermohaline circulation intensified.

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Methane as an Organic Matter Source and the Trophic Basis of a Laptev Sea Cold Seep Microbial Community

Cited by 40 publications

References 53 publications

Chemosynthesis influences food web and community structure in high-Arctic benthos

Chemosynthesis influences food web and community structure in high-Arctic benthos

Cold Seeps in a Warming Arctic: Insights for Benthic Ecology

Frenulate siboglinids at high Arctic methane seeps and insight into high latitude frenulate distribution

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