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Authors He, D; Ladd, SN; Sachs, JP; Jaffe, R
Author Full Name He, Ding; Ladd, S. Nemiah; Sachs, Julian P.; Jaffe, Rudolf
Title Inverse relationship between salinity and H-2/H-1 fractionation in leaf wax n-alkanes from Florida mangroves
Source ORGANIC GEOCHEMISTRY
Language English
Document Type Article
Author Keywords Hydrogen isotope fractionation; Mangroves; n-Alkanes; Paleoclimate; Estuary
Keywords Plus HYDROGEN ISOTOPE FRACTIONATION; DELTA-D VALUES; EVERGLADES NATIONAL-PARK; D/H FRACTIONATION; LATE HOLOCENE; FRESH-WATER; CONTINUOUS CULTURES; COASTAL EVERGLADES; SEASONAL-VARIATION; EMILIANIA-HUXLEYI
Abstract The effect of salinity on hydrogen isotope fractionation during the production of leaf wax n-alkanes was assessed for Laguncularia racemosa (white mangrove), Rhizophora mangle (red mangrove), and Avicennia germinans (black mangrove) along a 31 ppt (parts per thousand) salinity gradient in the Shark River estuary, Florida, USA. Significant variation in hydrogen isotope ratios was observed among these three Atlantic-East Pacific (AEP) species, with increasing leaf wax n-alkane H-2/H-1 fractionation with increasing salinity. Net H-2/H-1 fractionation for hentriacontane (n-C-31) increased by 0.8, 1.4 and 1.8%/ppt in R. mangle, A. germinans and L. racemosa, respectively. The observations are consistent with published delta H-2(nC31) data from 5 species of Indo-West Pacific (IWP) mangroves, which increased with salinity by 0.7-1.5%/ ppt. Although all measured species from both the AEP and IWP regions have more H-2/H-1 fractionation at high salinity, differences in slope and intercepts of these relationships are observed among genera. The differences may result from variation in the composition of compatible solutes, reliance on storage carbohydrates, and/or physiological response to salt. However, no statistically significant difference in the sensitivity of delta H-2(nC31) to salinity was observed in four Rhizophora species from both Indo-West Pacific and Americas-East Atlantic regions, which makes sedimentary Rhizophora lipids a promising target for paleohydroclimatic reconstruction. (C) 2017 Elsevier Ltd. All rights reserved.
Author Address [He, Ding] Zhejiang Univ, Sch Earth Sci, Hangzhou 310027, Zhejiang, Peoples R China; [He, Ding; Jaffe, Rudolf] Florida Int Univ, Dept Chem & Biochem, Marine Sci Program, 3000 NE 151st St, North Miami, FL 33181 USA; [Jaffe, Rudolf] Florida Int Univ, Southeast Environm Res Ctr, Miami, FL 33199 USA; [Ladd, S. Nemiah] Swiss Fed Inst Aquat Sci & Technol EAWAG, Dept Surface Waters Res & Management, Seestr 79, CH-6047 Kastanienbaum, Switzerland; [Sachs, Julian P.] Univ Washington, Sch Oceanog, Box 355351, Seattle, WA 98195 USA
Reprint Address He, D (reprint author), Zhejiang Univ, Sch Earth Sci, Hangzhou 310027, Zhejiang, Peoples R China.
E-mail Address dinghe@zju.edu.cn
ORCID Number Ladd, S. Nemiah/0000-0002-0132-5785
Funding Agency and Grant Number National Science Foundation through the Florida Coastal Everglades LTER program grant [DEB-1237517, EAR-1348396]; George Barley Endowment; Cristina Menendez Fellowship; Hundred-Talent Program at Zhejiang University [188020-193810201/102]
Funding Text The authors appreciate the assistance and advice of J.L. Breithaupt and J.M. Smoak during sample collection and of J. Harris, W.T. Anderson and D. Sachse during hydrogen isotope measurements. This material is based upon work supported by the National Science Foundation through the Florida Coastal Everglades LTER program grant number DEB-1237517 (to R.J.) and under Grant No. EAR-1348396 (to J.P.S.). R.J. and D.H. acknowledge additional support through the George Barley Endowment and the Cristina Menendez Fellowship respectively. D.H. also acknowledges partial funding from a Hundred-Talent Program under Grant No. 188020-193810201/102 at Zhejiang University for data analyses and manuscript writing. We also thank two anonymous reviewers for constructive comments. This is contribution number 829 from the Southeast Environmental Research Center at Florida International University.
Times Cited 6
Total Times Cited Count (WoS, BCI, and CSCD) 6
Publisher PERGAMON-ELSEVIER SCIENCE LTD
Publisher City OXFORD
Publisher Address THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
ISSN 0146-6380
29-Character Source Abbreviation ORG GEOCHEM
ISO Source Abbreviation Org. Geochem.
Publication Date AUG
Year Published 2017
Volume 110
Beginning Page 1
Ending Page 12
Digital Object Identifier (DOI) 10.1016/j.orggeochem.2017.04.007
Page Count 12
Web of Science Category Geochemistry & Geophysics
Subject Category Geochemistry & Geophysics
Document Delivery Number FB2TB
Unique Article Identifier WOS:000405995000001
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