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Version 3.20
Publication Type J
Authors Lambs, L; Mangion, P; Mougin, E; Fromard, F
Author Full Name Lambs, Luc; Mangion, Perrine; Mougin, Eric; Fromard, Francois
Title Water cycle and salinity dynamics in the mangrove forests of Europa and Juan de Nova Islands, southwest Indian Ocean
Language English
Document Type Article
Abstract RATIONALE: The functioning of mangrove forests found on small coralline islands is characterized by limited freshwater inputs. Here, we present data on the water cycling of such systems located on Europa and Juan de Nova Islands, Mozambique Channel. METHODS: In order to better understand the water cycle and mangrove growth conditions, we have analysed the hydrological and salinity dynamics of the systems by gauge pressure and isotopic tracing (delta O-18 and delta H-2 values). RESULTS: Both islands have important seawater intrusion as measured by the water level change and the high salinities in the karstic ponds. Europa Island displays higher salinity stress, with its inner lagoon, but presents a pluri-specific mangrove species formation ranging from shrub to forest stands. No freshwater signal could be detected around the mangrove trees. On Juan de Nova Island, the presence of sand and detrital sediment allows the storage of some amount of rainfall to form a brackish groundwater. The mangrove surface area is very limited with only small mono-specific stands being present in karstic depression. CONCLUSIONS: On the drier Europa Island, the salinity of all the water points is equal to or higher than that of the seawater, and on Juan de Nova the groundwater salinity is lower (5 to 20 PSU). This preliminary study shows that the karstic pothole mangroves exist due to the sea connection through the fractured coral and the high tidal dynamics. Copyright (c) 2015 John Wiley & Sons, Ltd.
Author Address [Lambs, Luc; Fromard, Francois] Univ Toulouse, UPS, INPT, Lab Ecol Fonct,EcoLab, F-31062 Toulouse, France; [Lambs, Luc; Fromard, Francois] CNRS, Lab Ecol Fonct,EcoLab, F-31062 Toulouse, France; [Mangion, Perrine] So Cross Univ, Ctr Coastal Biogeochem, Lismore, NSW 2480, Australia; [Mangion, Perrine] Univ La Reunion, CNRS, IRD, UMR ENTROPIE 9220, F-31400 Toulouse, France; [Mougin, Eric] Univ Toulouse, Observ Midi Pyrenees, IRD, UMR CNRS 5563,Geosci Environm Toulouse, F-31400 Toulouse, France; Univ Toulouse, UPS, INPT, Lab Ecol Fonct & Environm ECOLAB, F-31062 Toulouse, France
Reprint Address Lambs, L (reprint author), Univ Toulouse, UPS, INPT, Lab Ecol Fonct & Environm ECOLAB, 118 Route Narbonne, F-31062 Toulouse, France.
E-mail Address luc.lambs@univ-tlse3.fr
Funding Agency and Grant Number CNRS-INEE
Funding Text The authors thank CNRS-INEE for the financial support on the SPAM program for 2011-2013. They would also like to thank the staff of the Marion Dufresne scientific IPEV ship in 2011, and the owner of the 'Inventive' catamaran in 2013 (especially J.B. Calves) and people from the TAAF (as Sophie Marinesque) for the technical and human support; Jean Hivert (Centre Botanique National de Mascarin) for information on the presence of mangrove plots (J4, J5) on Juan de Nova and for the forest structure data for the Rhizophora pothole (E8) on Europa; Florent Barbecot (Uqam, Canada) for the xylem sap extraction technique with ceramic tubes; Laurent Testu (Legos) and Christine Drezen (Ipev) for the tide data for Juan de Nova and Europa (Rosame data network); and I. Moussa and D. Dalger (Ecolab) for the isotopic determination of delta18O and delta2H values for all the water and sap samples.
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Cited Reference Count 28
Publisher City HOBOKEN
Publisher Address 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
ISSN 0951-4198
29-Character Source Abbreviation RAPID COMMUN MASS SP
ISO Source Abbreviation Rapid Commun. Mass Spectrom.
Publication Date JAN 30
Year Published 2016
Volume 30
Issue 2
Beginning Page 311
Ending Page 320
Digital Object Identifier (DOI) 10.1002/rcm.7435
Page Count 10
Web of Science Category Biochemical Research Methods; Chemistry, Analytical; Spectroscopy
Subject Category Biochemistry & Molecular Biology; Chemistry; Spectroscopy
Document Delivery Number DD5VW
Unique Article Identifier WOS:000369993800008
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