Calibrating amino acid δ 13 C and δ 15 N offsets between polyp and protein skeleton to develop proteinaceous deep-sea corals as paleoceanographic archives
Calibrating amino acid δ 13 C and δ 15 N offsets between polyp and protein skeleton to develop proteinaceous deep-sea corals as paleoceanographic archives
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校准息肉和蛋白质骨架之间的氨基酸 δ 13 C 和 δ 15 N 偏移,以开发蛋白质深海珊瑚作为古海洋档案
DOI:
10.1016/j.gca.2017.09.048
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发表时间:
2018
影响因子:
5
通讯作者:
McCarthy, Matthew D.
中科院分区:
文献类型:
--
作者:
McMahon, Kelton W.;Williams, Branwen;Guilderson, Thomas P.;Glynn, Danielle S.;McCarthy, Matthew D.
Compound-specific stable isotopes of amino acids (CSI-AA) from proteinaceous deep-sea coral skeletons have the potential to improve paleoreconstructions of plankton community composition, and our understanding of the trophic dynamics and biogeochemical cycling of sinking organic matter in the Ocean. However, the assumption that the molecular isotopic values preserved in protein skeletal material reflect those of the living coral polyps has never been directly investigated in proteinaceous deep-sea corals. We examined CSI-AA from three genera of proteinaceous deep-sea corals from three oceanographically distinct regions of the North Pacific:Primnoafrom the Gulf of Alaska,Isidellafrom the Central California Margin, andKulamanamanafrom the North Pacific Subtropical Gyre. We found minimal offsets in the δ13C values of both essential and non-essential AAs, and in the δ15N values of source AAs, between paired samples of polyp tissue and protein skeleton. Using an essential AA δ13C fingerprinting approach, we show that estimates of the relative contribution of eukaryotic microalgae and prokaryotic cyanobacteria to the sinking organic matter supporting deep-sea corals are the same when calculated from polyp tissue or recently deposited skeletal tissue. The δ15N values of trophic AAs in skeletal tissue, on the other hand, were consistently 3–4‰ lower than polyp tissue for all three genera. We hypothesize that this offset reflects a partitioning of nitrogen flux through isotopic branch points in the synthesis of polyp (fast turnover tissue) and skeleton (slow, unidirectional incorporation). This offset indicates an underestimation, albeit correctable, of approximately half a trophic position from gorgonin protein-based deep-sea coral skeleton. Together, our observations open the door for applying many of the rapidly evolving CSI-AA based tools developed for metabolically active tissues in modern systems to archival coral tissues in a paleoceanographic context.
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影响因子:
2.6
作者:
Andrews, AH;Cordes, EE;Heifetz, J
通讯作者:
Heifetz, J
DOI:
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发表时间:
2004
期刊:
影响因子:
--
作者:
S. Roberts;M. Hirshfield
通讯作者:
M. Hirshfield
DOI:
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发表时间:
2015
期刊:
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作者:
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通讯作者:
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DOI:
10.1016/j.dsr2.2013.07.010
发表时间:
2014
影响因子:
3
作者:
Kelly M. Strzepek;Robert E. Thresher;A. Revill;Colin Smith;Aimée F. Komugabe;S. Fallon
通讯作者:
S. Fallon
DOI:
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发表时间:
1988
期刊:
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--
作者:
A. Serban;M. Engel;S. Macko
通讯作者:
S. Macko