Intrathalline Metabolite Profiles in the Lichen <Emphasis Type="Italic">Argopsis friesiana</Emphasis> Shape Gastropod Grazing Patterns |
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Authors: | Alice Gadea Anne-Cécile Le Lamer Sophie Le Gall Catherine Jonard Solenn Ferron Daniel Catheline Damien Ertz Pierre Le Pogam Joël Boustie Françoise Lohézic - Le Devehat Maryvonne Charrier |
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Affiliation: | 1.Univ Rennes, CNRS,ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226,Rennes,France;2.Univ Rennes, CNRS,ECOBIO (Ecosystèmes, Biodiversité, Evolution) - UMR 6553,Rennes,France;3.Univ Toulouse 3 Paul Sabatier, IRD, Pharma-Dev - UMR 152,Toulouse,France;4.INRA, BIA (Biopolymers Interactions Assemblies) - UR 1268,Nantes,France;5.INRA, BIA (Biopolymers Interactions Assemblies) - UR 1268,Le Rheu,France;6.INRA, Agrocampus Ouest - USC 1378,Rennes Cedex,France;7.Botanic Garden Meise, Department Research,Meise,Belgium;8.Univ Rennes, CNRS,IETR (Institut d’Electronique et de Télécommunications de Rennes) - UMR 6164,Rennes,France |
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Abstract: | Lichen-gastropod interactions generally focus on the potential deterrent or toxic role of secondary metabolites. To better understand lichen-gastropod interactions, a controlled feeding experiment was designed to identify the parts of the lichen Argopsis friesiana consumed by the Subantarctic land snail Notodiscus hookeri. Besides profiling secondary metabolites in various lichen parts (apothecia, cephalodia, phyllocladia and fungal axis of the pseudopodetium), we investigated potentially beneficial resources that snails can utilize from the lichen (carbohydrates, amino acids, fatty acids, polysaccharides and total nitrogen). Notodiscus hookeri preferred cephalodia and algal layers, which had high contents of carbohydrates, nitrogen, or both. Apothecia were avoided, perhaps due to their low contents of sugars and polyols. Although pseudopodetia were characterized by high content of arabitol, they were also rich in medullary secondary compounds, which may explain why they were not consumed. Thus, the balance between nutrients (particularly nitrogen and polyols) and secondary metabolites appears to play a key role in the feeding preferences of this snail. |
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