Stable isotope signatures and methane use by New Zealand cold seep benthos

Thurber, Andrew R.; Kröger, Kerstin; Neira, Carlos; Wiklund, Helena; Levin, Lisa A.

doi:10.1016/j.margeo.2009.06.001

Cited by 79 publications

(87 citation statements)

References 56 publications

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“…Hikurangi margin, where they are associated with sulfidic sediments and areas of active seepage (Baco et al, 2010;Bowden et al, 2013;Thurber et al, 2010). Similarly, the onuphid polychaete, Hyalinoecia artifex has been observed at US Atlantic seeps, where they maintain a carnivorous, epibenthic lifestyle, crawling and dragging their tubes along the seafloor (Meyer et al, 2016).…”

mentioning

confidence: 99%

“…For example, seep sediment is dominated by sulfate reducing and sulfur oxidizing bacteria as well as methanotrophs, whereas seafloor sediment from non-seep areas is dominated by more cosmopolitan bacteria (Seabrook et al, 2017). Spherical Pseudosuberites sponges from New Zealand seeps are even hypothesized to be chemoautotrophic (Thurber et al, 2010). In general, sponges and corals tend to have a highly diverse bacterial microbiome (Blackall et al, 2015 Vacelet and Donadey, 1977).…”

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confidence: 99%

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Geophysical and geochemical controls on the megafaunal community of a high Arctic cold seep

Sen¹,

Åström²,

Hong³

et al. 2018

Preprint

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Cold seep communities around gas hydrate mounds (pingos) in the Western Barents Sea (76°N, 16°E, ~400 m depth) were investigated with high resolution, geographically referenced images acquired with an ROV and towed camera. Four pingos associated with seabed methane release hosted diverse biological communities of mainly non-seep (background) species including commercially important fish and crustaceans, as well as a species new to this area (the snow crab Chionoecetes 15 opilio). We attribute the presence of most benthic community members to habitat heterogeneity and the occurrence of hard substrates (methane derived authigenic carbonates), particularly the most abundant phyla (Cnidaria and Porifera), though food availability and exposure to a diverse microbial community is also important for certain taxa. Only one chemosynthesis based species was confirmed, the siboglinid frenulate polychaete, Oligobrachia haakonmosbiensis. Overall, the pingo communities formed two distinct clusters, distinguished by the presence or absence of frenulates. Methane gas advection through sediments 20 was absent below the single pingo that lacked frenulates, while seismic profiles indicated gas saturated sediment below the other frenulate colonized pingos. The absence of frenulates could not be explained by sediment sulfide concentrations, despite these worms likely containing sulfide oxidizing symbionts. We propose that high levels of seafloor methane seepage linked to sub-surface gas reservoirs support an abundant and active sediment methanotrophic community that maintains high sulfide fluxes and serves as a carbon source for frenulate worms. The pingo currently lacking a sub-surface gas source and lower 25 methane concentrations has lower sulfide flux rates and limited amounts of carbon insufficient to support frenulates. Two previously undocumented behaviors were visible through the images: grazing activity of snow crabs on bacterial mats, and seafloor crawling of Nothria conchylega onuphid polychaetes.Biogeosciences Discuss., https://doi

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mentioning

confidence: 99%

mentioning

confidence: 99%

Geophysical and geochemical controls on the megafaunal community of a high Arctic cold seep

Sen¹,

Åström²,

Hong³

et al. 2018

Preprint

View full text Add to dashboard Cite

show abstract

“…Whenever possible, replicate measurements of grouped individuals were carried and stable isotope data represent average values within single species. We recognize the potential for nutritional variability within seep individuals (Thurber et al 2009), but we believe that the data is still informative of food web patterns at our study site. Unfortunately, we lack isotope data from a broad number of background species and from potential organic sources from San…”

Section: Study Site and Methodsmentioning

confidence: 93%

“…Several trophic levels derived their nutrition direct or indirectly from sulfur-oxidizing bacterial mats, evidencing that whale-falls provide abundant sources of chemosynthetic carbon like cold seeps and hot vents (Levin & Michener 2002, Thurber et al 2009). The broad isotopic range in multiple congeneric dorvilleid species supports the existence of sedimentary microhabitats with abundant sulfur-bacterial carbon.…”

Section: Discussionmentioning

confidence: 99%

“…Sediment geochemistry can vary significantly between seep microhabitats, creating very specific conditions for its associated community (Tryon & Brown 2001). For example, sulfide-rich sediments host many chemosynthetic-based and endemic species, such as Beggiatoa mats, bivalves, pogonophoran and other polychaetes , Sibuet & Olu 1998, Thurber et al 2009). Several heterotrophic opportunist species are also able to tolerate such high sulphidic sediments and exploit rich organic sources in some seep habitats .…”

Section: Discussionmentioning

confidence: 99%

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Sucessão ecológica em parcelas orgânicas de madeira, macroalgas e em carcassas de baleia no mar profundo; e similaridade de espécies entre habitats redutores no talude continental da Califórnia (Pacífico Nordeste)

Bernardino¹

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Bivalve shell horizons in seafloor pockmarks of the last glacial‐interglacial transition: a thousand years of methane emissions in the Arctic Ocean

Ambrose

Panieri

Schneider

et al. 2015

Geochem Geophys Geosyst

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We studied discrete bivalve shell horizons in two gravity cores from seafloor pockmarks on the Vestnesa Ridge (∼1200 m water depth) and western Svalbard (79°00′ N, 06°55′ W) to provide insight into the temporal and spatial dynamics of seabed methane seeps. The shell beds, dominated by two genera of the family Vesicomyidae: Phreagena s.l. and Isorropodon sp., were 20–30 cm thick and centered at 250–400 cm deep in the cores. The carbon isotope composition of inorganic (δ13C from −13.02‰ to +2.36‰) and organic (δ13C from −29.28‰ to −21.33‰) shell material and a two‐end member mixing model indicate that these taxa derived between 8% and 43% of their nutrition from chemosynthetic bacteria. In addition, negative δ13C values for planktonic foraminifera (−6.7‰ to −3.1‰), concretions identified as methane‐derived authigenic carbonates, and pyrite‐encrusted fossil worm tubes at the shell horizons indicate a sustained paleo‐methane seep environment. Combining sedimentation rates with 14C ages for bivalve material from the shell horizons, we estimate the horizons persisted for about 1000 years between approximately 17,707 and 16,680 years B.P. (corrected). The seepage event over a 1000 year time interval was most likely associated with regional stress‐related faulting and the subsequent release of overpressurized fluids.

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Stable isotope signatures and methane use by New Zealand cold seep benthos

Cited by 79 publications

References 56 publications

Geophysical and geochemical controls on the megafaunal community of a high Arctic cold seep

Geophysical and geochemical controls on the megafaunal community of a high Arctic cold seep

Sucessão ecológica em parcelas orgânicas de madeira, macroalgas e em carcassas de baleia no mar profundo; e similaridade de espécies entre habitats redutores no talude continental da Califórnia (Pacífico Nordeste)

Bivalve shell horizons in seafloor pockmarks of the last glacial‐interglacial transition: a thousand years of methane emissions in the Arctic Ocean

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