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Author |
Hobson, KA; Ambrose Jr, WG; Renaud, PE |
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Title |
Sources of primary production, benthic-pelagic coupling, and trophic relationships within the Northeast Water Polynya: Insights from δ13C and δ15N analysis |
Type |
Journal Article |
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Year |
1995 |
Publication |
Marine Ecology Progress Series |
Abbreviated Journal |
Mar Ecol Prog Ser |
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Volume |
128 |
Issue |
1-3 |
Pages  |
1-10 |
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Keywords |
phytobenthos; polynyas; carbon 13; nitrogen isotopes; food webs; check lists; trophic structure; Algae; PNE, Greenland, Northeast Water Polynya |
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Abstract |
We used stable carbon (13C/12C) and nitrogen (15N/14N) isotope analysis to investigate linkages between sources of primary production and the pelagic and benthic components of the Northeast Water (NEW) Polynya off northeastern Greenland. Ice algae was enriched in 13C (mean δ13C = -18.6 vs -27.9 ppt) and 15N (mean δ15N = 8.3 vs 4.9 ppt) over particulate organic matter
(POM) suggesting that the relative importance of these sources might be traced isotopically. Most grazing crustaceans and filter-feeding bivalves had δ13C and δ15N values in the range of -21 to -23 ppt and 7 to 9 ppt, respectively, indicating a direct pathway from POM. Close benthic-pelagic coupling was also confirmed for other benthic organisms examined with the exception of the predatory or deposit feeding echinoderms Ophiocten, Ophiacantha and Pontaster. Compared with other Arctic and temperate marine food webs, stable-carbon isotope values for the NEW Polynya were depleted in 13C. A δ15N trophic model that incorporated taxon-specific isotopic fractionation factors indicated that the NEW Polynya consisted of 4.5 to 5 trophic levels. Stable-isotope analysis may be well suited to establishing the importance of polynyas as sites of high primary productivity and tight benthic-pelagic coupling relative to regions of more permanent ice cover. |
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Canadian Wildlife Service, 115 Perimeter Road, Saskatoon, SK S7N 0X4, Canada |
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Publisher |
Inter-Research |
Place of Publication |
Oldendorf/Luhe |
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Language |
English |
Summary Language |
English |
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ISSN |
0171-8630 |
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Northeast Water Polynya; Northeast Greenland Shelf; Arctic |
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Notes |
Bibliogr.: 63 ref. |
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Call Number |
refbase @ user @ 133 |
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3 |
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Author |
Hobson, KA; Ambrose Jr, WG; Renaud, PE |
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Title |
Sources of primary production, benthic-pelagic coupling, and trophic relationships within the Northeast Water Polynya: insights from δ13C and δ15N analysis |
Type |
Journal Article |
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Year |
1995 |
Publication |
Marine Ecology Progress Series |
Abbreviated Journal |
Mar Ecol Prog Ser |
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Volume |
128 |
Issue |
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Pages |
1-10 |
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Keywords |
ARK; Greenland; NEW; Polynya; Isotopes; 13C; 15N; Benthos; Food |
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Publisher |
Inter-Research |
Place of Publication |
Oldendorf/Luhe |
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Language |
English |
Summary Language |
English |
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0171-8630 |
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no |
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Call Number |
refbase @ user @ NEW Zonation(96) |
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10 |
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Author |
Amon, RMW; Budéus, G; Meon, B |
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Title |
Dissolved organic carbon distribution and origin in the Nordic Seas: Exchanges with the Arctic Ocean and the North Atlantic |
Type |
Journal Article |
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Year |
2003 |
Publication |
Journal of Geophysical Research |
Abbreviated Journal |
J Geophys Res |
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Volume |
108 |
Issue |
C7 |
Pages |
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Keywords |
dissolved organic matter; dissolved organic carbon; chromophoric dissolved organic matter; fluorescence; vertical carbon transport |
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Abstract |
Dissolved organic carbon (DOC) and in situ fluorescence were measured along with hydrographic parameters in the Greenland, Iceland, and Norwegian Seas (Nordic Seas). Surface (<100 m) concentrations of DOC ranged from 60 to 118 µM with elevated values in the East Greenland Current (EGC) which transports water from the Arctic Ocean to the North Atlantic. EGC surface waters also showed a pronounced fluorescence maximum between 30 and 120 m depth in all EGC sections indicating the abundance of Arctic river derived DOC in this current. Based on fluorescence we estimated that 20-50% of the annual river discharge to the Arctic Ocean was exported in the EGC. The fluorescence maximum was typically associated with salinity around 33 and temperatures below -1°C which are characteristic of surface and upper halocline water in the Arctic Ocean. The elevated fluorescence in this water mass suggests a strong Eurasian shelf component and also suggests that in situ fluorescence could be used to trace Eurasian shelf water in the central Arctic Ocean. DOC concentrations in the Nordic Sea basins (>1000 m) were relatively high (~50 µM DOC) compared with other ocean basins indicating active vertical transport of DOC in this region on decadal timescales. Based on existing vertical transport estimates and 15 µM of semilabile DOC we calculated an annual vertical net DOC export of 3.5 Tg C yr-1 in the Greenland Sea and about 36 Tg C yr-1 for the entire Arctic Mediterranean Sea (AMS) including the Greenland-Scotland Ridge overflow. It appears that physical processes play a determining role for the distribution of DOC in the AMS. |
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American Geophysical Union |
Place of Publication |
Washington, DC |
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English |
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English |
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Nordic Seas |
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no |
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refbase @ user @ ms |
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5 |
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