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• W2471786043 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 552:1-18 (2016) - DOI: https://doi.org/10.3354/meps11773 FEATURE ARTICLE Arctic cold seeps in marine methane hydrate environments: impacts on shelf macrobenthic community structure offshore Svalbard Emmelie K. L. Åström1,*, Michael L. Carroll1,2, William G. Ambrose Jr.1,3,4, JoLynn Carroll1,2 1CAGE – Centre for Arctic Gas hydrate, Environment and Climate, Department of Geology, UiT The Arctic University of Norway, 9037 Tromsø, Norway 2Akvaplan-niva, FRAM - High North Research Centre for Climate and the Environment, 9296 Tromsø, Norway 3Department of Biology, Bates College, Lewiston, Maine 04240, USA 4Division of Polar Programs, National Science Foundation, Arlington, Virginia 22230, USA *Corresponding author: emmelie.k.astrom@uit.no ABSTRACT: Cold seeps are locations where hydrocarbons emanate from the seabed, fueling chemoautotrophic production that may support macrofaunal communities via chemosymbiosis or trophic interactions. The recent discovery of offshore sub-seabed gas reservoirs and venting methane at the seabed in Svalbard (75 to 79°N) provides the context to examine the influence of cold seeps on macrofaunal community structure in the high-Arctic. We compared benthic macrofaunal community structure from cold-seep environments and paired control stations from 3 regionally distinct areas along the western Svalbard margin and the western Barents Sea. Specialized seep-related polychaetes (e.g. siboglinid tubeworms) were found at seep stations in the Barents Sea in high densities (up to 7272 ind. m-2). The presence of obligate seep-associated faunal taxa demonstrates that chemoautotrophic production, fueled by methane and sulfur, influences benthic communities at these seeps. Further, total biomass was significantly higher at seep-impacted stations compared to controls (mean = 20.7 vs. 9.8 g wet weight sample-1), regardless of region. Four methane seep-influenced samples showed clear indications of seep impact, with reduced diversity and with a few species dominating, compared to controls. Our results demonstrate that the effect of methane seeps on the Svalbard shelf benthic community are highly localized (i.e. meter scale), reflecting strong gradients associated with the point-source impacts of individual seeps. Regional differences and the restricted spatial extent of focused emissions likely drive the observed complexity and heterogeneity at Svalbard cold seeps. These results provide key baseline observations in a high-Arctic location that is likely to be influenced by warming sea temperatures, which may lead to increased seabed methane release. KEY WORDS: Chemosynthesis · Arctic · Benthic ecology · Biodiversity · Siboglinidae Full text in pdf format Information about this Feature Article NextCite this article as: Åström EKL, Carroll ML, Ambrose WG Jr, Carroll J (2016) Arctic cold seeps in marine methane hydrate environments: impacts on shelf macrobenthic community structure offshore Svalbard. Mar Ecol Prog Ser 552:1-18. https://doi.org/10.3354/meps11773 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 552. Online publication date: June 23, 2016 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2016 Inter-Research." @default.
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• W2471786043 date "2016-06-23" @default.
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• W2471786043 title "Arctic cold seeps in marine methane hydrate environments: impacts on shelf macrobenthic community structure offshore Svalbard" @default.
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