Title |
Fatty acid and stable isotope characteristics of sea ice and pelagic particulate organic matter in the Bering Sea: tools for estimating sea ice algal contribution to Arctic food web production
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Published in |
Oecologia, November 2013
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DOI | 10.1007/s00442-013-2832-3 |
Pubmed ID | |
Authors |
Shiway W. Wang, Suzanne M. Budge, Rolf R. Gradinger, Katrin Iken, Matthew J. Wooller |
Abstract |
We determined fatty acid (FA) profiles and carbon stable isotopic composition of individual FAs (δ(13)CFA values) from sea ice particulate organic matter (i-POM) and pelagic POM (p-POM) in the Bering Sea during maximum ice extent, ice melt, and ice-free conditions in 2010. Based on FA biomarkers, differences in relative composition of diatoms, dinoflagellates, and bacteria were inferred for i-POM versus p-POM and for seasonal succession stages in p-POM. Proportions of diatom markers were higher in i-POM (16:4n-1, 6.6-8.7%; 20:5n-3, 19.6-25.9%) than in p-POM (16:4n-1, 1.2-4.0%; 20:5n-3, 5.5-14.0%). The dinoflagellate marker 22:6n-3/20:5n-3 was highest in p-POM. Bacterial FA concentration was higher in the bottom 1 cm of sea ice (14-245 μg L(-1)) than in the water column (0.6-1.7 μg L(-1)). Many i-POM δ(13)C(FA) values were higher (up to ~10‰) than those of p-POM, and i-POM δ(13)C(FA) values increased with day length. The higher i-POM δ(13)C(FA) values are most likely related to the reduced dissolved inorganic carbon (DIC) availability within the semi-closed sea ice brine channel system. Based on a modified Rayleigh equation, the fraction of sea ice DIC fixed in i-POM ranged from 12 to 73%, implying that carbon was not limiting for primary productivity in the sympagic habitat. These differences in FA composition and δ(13)C(FA) values between i-POM and p-POM will aid efforts to track the proportional contribution of sea ice algal carbon to higher trophic levels in the Bering Sea and likely other Arctic seas. |
Mendeley readers
Geographical breakdown
Country | Count | As % |
---|---|---|
Canada | 2 | 2% |
United States | 2 | 2% |
Mexico | 1 | <1% |
Germany | 1 | <1% |
Japan | 1 | <1% |
Belgium | 1 | <1% |
Unknown | 116 | 94% |
Demographic breakdown
Readers by professional status | Count | As % |
---|---|---|
Student > Master | 24 | 19% |
Researcher | 22 | 18% |
Student > Ph. D. Student | 22 | 18% |
Student > Bachelor | 10 | 8% |
Other | 6 | 5% |
Other | 19 | 15% |
Unknown | 21 | 17% |
Readers by discipline | Count | As % |
---|---|---|
Agricultural and Biological Sciences | 49 | 40% |
Environmental Science | 27 | 22% |
Earth and Planetary Sciences | 9 | 7% |
Biochemistry, Genetics and Molecular Biology | 6 | 5% |
Engineering | 2 | 2% |
Other | 4 | 3% |
Unknown | 27 | 22% |