Carbon and hydrogen isotopic compositions of sterols from riverine and marine sediments

Yoshito Chikaraishi, Yusuke Yamada, Hiroshi Naraoka

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

The sources (marine algae, terrestrial C3 and C4 plants) of sterols deposited to sediments along a riverine-marine transect from Ohtsuchi River in Iwate Prefecture, Japan, to the northwestern Pacific Ocean were estimated using carbon (δ13C) and hydrogen isotopic compositions (δD) in surface sediments. In marine sediments, algal sterols such as 24-methylcholesta-5,22-dien-3β-ol had δ13C values of -22.7 ± 0.4‰ and δD values of -292 ± 3‰. In contrast, sterols derived from multiple potential sources, such as 24-methylcholest-5-en-3β-ol and 24-ethylcholest-5-en-3β-ol, were gradually enriched in 13C from riverine (-30.7‰ and -30.5‰, respectively) to marine sediments (-22.3‰ and -24.4‰, respectively), but showed little variation in δD values (-262 ± 1‰). These isotopic signatures suggest that 24-methylcholest-5-en-3β-ol and 24-ethylcholest-5-en-3β-ol are derived from C3 plants (∼90%) and C4 plants (∼10%) in the riverine sediments, and marine algae (∼30%), C3 plants (∼30%), and C4 plants (∼40%) in the open marine sediments. Thus, dual isotopic compositions (δ 13C-δD) of sterols allow determinations of the proportions of three biological sources, in which the relative contribution of C3 plants decreases while that of marine algae and C4 plants increases from riverine to marine sediments. These results indicate that δ13C-δD signatures of sterols provide a useful tool for interpreting the sources of sedimentary organic matter and for understanding the transport and mixing processes of distinct biological sources in riverine-marine environments.

Original languageEnglish
Pages (from-to)1763-1770
Number of pages8
JournalLimnology and Oceanography
Volume50
Issue number6
DOIs
Publication statusPublished - Jan 1 2005
Externally publishedYes

Fingerprint

algae
sterol
C4 plants
C3 plants
marine sediments
C4 plant
C3 plant
sterols
hydrogen
marine sediment
isotopic composition
carbon
sediments
alga
sediment
phytosterols
Pacific Ocean
marine environment
organic matter
Japan

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Aquatic Science

Cite this

Carbon and hydrogen isotopic compositions of sterols from riverine and marine sediments. / Chikaraishi, Yoshito; Yamada, Yusuke; Naraoka, Hiroshi.

In: Limnology and Oceanography, Vol. 50, No. 6, 01.01.2005, p. 1763-1770.

Research output: Contribution to journalArticle

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title = "Carbon and hydrogen isotopic compositions of sterols from riverine and marine sediments",
abstract = "The sources (marine algae, terrestrial C3 and C4 plants) of sterols deposited to sediments along a riverine-marine transect from Ohtsuchi River in Iwate Prefecture, Japan, to the northwestern Pacific Ocean were estimated using carbon (δ13C) and hydrogen isotopic compositions (δD) in surface sediments. In marine sediments, algal sterols such as 24-methylcholesta-5,22-dien-3β-ol had δ13C values of -22.7 ± 0.4‰ and δD values of -292 ± 3‰. In contrast, sterols derived from multiple potential sources, such as 24-methylcholest-5-en-3β-ol and 24-ethylcholest-5-en-3β-ol, were gradually enriched in 13C from riverine (-30.7‰ and -30.5‰, respectively) to marine sediments (-22.3‰ and -24.4‰, respectively), but showed little variation in δD values (-262 ± 1‰). These isotopic signatures suggest that 24-methylcholest-5-en-3β-ol and 24-ethylcholest-5-en-3β-ol are derived from C3 plants (∼90{\%}) and C4 plants (∼10{\%}) in the riverine sediments, and marine algae (∼30{\%}), C3 plants (∼30{\%}), and C4 plants (∼40{\%}) in the open marine sediments. Thus, dual isotopic compositions (δ 13C-δD) of sterols allow determinations of the proportions of three biological sources, in which the relative contribution of C3 plants decreases while that of marine algae and C4 plants increases from riverine to marine sediments. These results indicate that δ13C-δD signatures of sterols provide a useful tool for interpreting the sources of sedimentary organic matter and for understanding the transport and mixing processes of distinct biological sources in riverine-marine environments.",
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