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Stable nitrogen isotope composition in sedimentary organic matter as a potential proxy of nitrogen sources for primary producers at a fringing coral reef

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Stable nitrogen isotope composition in sedimentary organic matter as a potential proxy of nitrogen sources for primary producers at a fringing coral reef

Content Provider	Springer Nature Link
Author	Umezawa, Yu Miyajima, Toshihiro Koike, Isao
Copyright Year	2008
Abstract	The stable nitrogen isotope ratio (δ $^{15}$N) in macroalgae is effectively used as a time-integrated bioindicator to record nitrogen sources for primary producers during their growing periods in aquatic ecosystems. However, the utility of this tool is limited because the occurrence of these organisms is often restricted in space and time. To investigate the potential of chemical composition in sedimentary organic matter (SOM) as a proxy for time-integrated environmental conditions, nitrogen (N) and carbon (C) contents and their stable isotope ratios (δ $^{15}$N and δ $^{13}$C) were determined, and systematically cross-checked against corresponding values in macroalgae at the Shiraho fringing reef in Okinawa, Japan. Preliminary trials showed that δ $^{15}$N in SOM processed by the “wash-out method” for δ $^{13}$C analysis yielded similar δ $^{15}$N values to the bulk sediment, despite the loss of some SOM during the process. The amounts of organic matter and the ratio of the HCl-insoluble portion were variable within the reef, probably reflecting local vegetation and subsequent decomposition. The distribution of δ $^{15}$N and δ $^{13}$C in SOM showed similar trends to those of macroalgae, with mostly constant differences of 1.4‰ and −6.7‰, respectively. These differences throughout the reef appeared to be explained in terms of mixed contributions from macrophyte and epibenthic microalgae growing in different seasons and years, with their debris undergoing diagenetic alteration. Therefore, macroalgae and SOM δ-values can be used in a complementary manner, over various time scales, as indicators of the integrated effect of dissolved inorganic nitrogen (DIN) sources on coral reef ecosystems.
Starting Page	899
Ending Page	909
Page Count	11
File Format	PDF
ISSN	09168370
Journal	Journal of Oceanography
Volume Number	64
Issue Number	6
e-ISSN	1573868X
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-11-05
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Stable isotope signatures sedimentary organic matter (SOM) nutrient dynamics land-derived nitrogen macroalgae Freshwater & Marine Ecology Oceanography
Content Type	Text
Resource Type	Article
Subject	Oceanography

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