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Publication Type J
Authors He, D., B. R. T. Simoneit, B. Jara and R. Jaffe
Title Compositions and isotopic differences of iso- and anteisoalkanes in black mangroves (Avicennia germinans) across a salinity gradient in a subtropical estuary
Source Environmental Chemistry
Abstract Aseries of iso- and anteiso- monomethylalkanes (MMAs) with carbon numbers from C-23 to C-35 and C-14 to C-34 respectively were detected in Avicennia germinans. These compounds were present in varying amounts up to 54.1, 1.0 and 3.4 mu g g(-1) dry weight in the leaves, bark and the crustose lichens attached to the bark of A. germinans respectively. These MMAs were not detected in the leaf waxes of Rhizophora mangle and Laguncularia racemosa, but were detected in significantly lower abundances (2- 6% of that in A. germinans leaf wax) in the bark and lichen of R. mangle. Significant odd- carbon number distributions and even-carbon number distributions were observed for long chain (C >= 25) iso(maximising at C-31) and anteiso-MMAs (maximising at C-32) respectively in A. germinans leaf wax. However, no obvious carbon number preferences were detected for bark and lichen. The long chain (LC) iso- and anteiso-MMAs in A. germinans leaf waxes were found to be enriched in C-13 by 0.3- 4.3 and 0.7-4.2 per mille (%) compared to the n- alkanes with the same carbon numbers respectively across the salinity gradient of 19.7-32.0 practical salinity units (psu). In comparison, the LC iso- and anteiso-MMAs were found to be more depleted in D by 6.1-55.1 and 7.3-57.0% compared to the n-alkanes with same carbon numbers respectively. The results imply that A. germinans could be another important source of iso- and anteiso-alkanes in sediments and soils, and that these compounds could potentially be used as biomarkers for this species in mixed mangrove environments.
ISSN 1448-2517
ISBN 1448-2517
Publication Date 2016
Year Published 2016
Volume 13
Issue 4
Beginning Page 623-630
Digital Object Identifier (DOI) 10.1071/en15128
Unique Article Identifier WOS:000379973200006
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