Reference : Carbon and nitrogen isotopic ratios of the seagrass Posidonia oceanica: Depth-related...
Scientific journals : Article
Life sciences : Aquatic sciences & oceanology
Life sciences : Phytobiology (plant sciences, forestry, mycology...)
http://hdl.handle.net/2268/1106
Carbon and nitrogen isotopic ratios of the seagrass Posidonia oceanica: Depth-related variations
English
Lepoint, Gilles mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Océanologie >]
Dauby, Patrick mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Systématique et diversité animale >]
Fontaine, Michael [Université de Liège - ULg > Département de chimie (sciences) > Chimie macromoléculaire et catalyse organique >]
Bouquegneau, Jean-Marie mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Océanologie >]
Gobert, Sylvie mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Océanologie >]
2003
Botanica Marina
Walter De Gruyter & Co
46
6
555-561
Yes (verified by ORBi)
International
0006-8055
Berlin
[en] northwest Mediterranean Sea ; Posidonia ; seagrass ; stable isotopes
[en] Nitrogen (delta(15)N) and carbon (delta(13)C) isotopic compositions of Posidonia oceanica were determined during three seasons along a bathymetric gradient (438 m depth).The delta(15)N values are low (2.2+/-0.9%) and variable.They do not show any relation to depth or sampling dates. There is a significant difference between the delta(15)N values of the youngest and the oldest leaves, probably as a result of N resorption and senescing during leaf ageing. The delta(13)C values of young Posidonia leaves vary with depth, showing the relationship between delta(13)C values and primary productivity rate, and the use of a bicarbonate/CO2 mixture as an inorganic carbon source. The delta(13)C values of the oldest P. oceanica leaves are depleted in C-13 compared to those of young leaves. This modification of the C-13 signatures in relation to leaf age is particularly important between 20 and 29 m depth. This modification could be related to photosynthetic rate change during ageing, but also to change in carbohydrate composition and content.
Centre Interfacultaire de Recherches en Océanologie - MARE
Fonds pour la formation à la Recherche dans l'Industrie et dans l'Agriculture (Communauté française de Belgique) - FRIA ; Communauté française de Belgique - CfB
Researchers ; Students
http://hdl.handle.net/2268/1106

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