Inter-specific and geographical variations in the fatty acid composition of mangrove leaves: implications for using fatty acids as a taxonomic tool and tracers of organic matter |
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Authors: | T Meziane S Y Lee P L Mfilinge P K S Shin M H W Lam M Tsuchiya |
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Institution: | (1) Centre for Aquatic Processes and Pollution, Griffith University , PMB 50 Gold Coast, QLD, 9726, Australia;(2) Centre for Aquatic Processes and Pollution and School of Environmental and Applied Science, Griffith University, PMB 50 Gold Coast, QLD, 9726, Australia;(3) Laboratory of Ecology and Systematics, Faculty of Science, University of the Ryukyus , Senbaru 1, Nishihara Okinawa, 903-0213, Japan;(4) Department of Biology and Chemistry, City University of Hong Kong , Tat Chee Avenue, Kowloon, Hong Kong SAR, China;(5) Present address: UMR-CNRS 5178, Biologie des Organismes Marins et Ecosystèmes, Département Milieux et Peuplements Aquatiques, MNHN, CP 53, 61 rue Buffon, 75231 Paris cedex 05, France |
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Abstract: | Fatty acid compositions of the leaves of six species of mangroves were studied to ascertain their use as biomarkers for determining
the fate of mangrove organic matter in the habitat and as taxonomic tool. Mangrove leaves were collected from three locations
in the western Pacific Ocean: Moreton Bay (MB) (Australia), Hong Kong (China) and Okinawa (Japan). In MB, samples were collected
from two sites separated by 15 km: Logan River Estuary (LRE) and Jabiru Island. In addition, along the LRE, leaves were collected
from five stations at ∼2–3 km apart. Results show that the analysis of the entire fatty acid profiles of the mangrove leaves
is a promising taxonomic tool as the profiles of most species were sufficiently different to be separated in an non-metric
multidimensional scaling plot. In addition, geographically separated populations of the same species could also be identified
by their fatty acid profiles. In most cases, two non-ubiquitous groups of fatty acids dominated in the mangrove leaves: the
polyunsaturated 18:2ω6 and 18:3ω3 and the long chain fatty acids (≥24:0). With respect to the relative contributions of these
fatty acids, three groups of species were identified, in which one or both groups of fatty acids may potentially be used as
markers of the mangrove organic matter in the estuarine environment. |
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