@article {1874,
	title = {Terpene-based selective herbivory by Helix aspersa (Mollusca) on Thymus vulgaris (Labiatae)},
	journal = {Oecologia},
	volume = {102},
	year = {1995},
	note = {From Duplicate 1 (                           Terpene-Based Selective Herbivory by Helix-Aspersa (Mollusca) on Thymus-Vulgaris (Labiatae)                         - Linhart, Y B; Thompson, J D )                
PT: J
        
},
	month = {1995/04//},
	pages = {126 - 132},
	address = {Affiliation: Univ.CO,Dept Environ.Popul.\& Orgmic Biol., Boulder, CO 80309, United States},
	abstract = {In natural populations of Thymus vulgaris in the south of France, six genetically different chemical {\textquoteright}{\textquoteright}chemotypes{\textquoteright}{\textquoteright} occur, each differentiated by a single dominant monoterpene that gives individual plants a characteristic smell and taste. Individual populations may contain all six chemotypes, but are often dominated by one to three chemotypes. We tested the hypothesis that this chemical polymorphism was associated with selective herbivory by the snail Helix aspersa, which feeds upon T. vulgaris in nature. The relative preference of juvenile and adult molluscs was investigated by presenting individual animals with a choice of six chemotypes in three experimental trials: (1) whole plants, (2) nutritive gels containing crushed thyme leaves, and (3) nutritive gels containing a distilled monoterpene as an additive. We found significant and consistent patterns of preference. Adult and immature molluscs preferred the linalol chemotype, and ate carvacrol and thymol-containing foods the least. This preference was more marked when using the gels than the real plants, particularly the monoterpene-based gels, demonstrating the importance of the monoterpene for the choice. Furthermore, molluscs fed exclusively on linalol-containing food gained weight whereas those fed on carvacrol-containing food lost weight. After being fed these exclusive diets both groups showed a significant preference for linalol. These results (1) demonstrate that food choice is based upon the presence of specific monoterpenes and is not learned, (2) suggest that phenolic monoterpenes such as carvacrol are repellent to the animals, and (3) indicate that selective herbivory may play a significant role in the maintenance of the chemical polymorphism of T. vulgaris.},
	url = {http://www.scopus.com/scopus/inward/record.url?eid=2-s2.0-0028975168\&partnerID=40\&rel=R6.5.0},
	author = {Linhart, Y B and Thompson, J D}
}
@article {1814,
	title = {Intra-specific variation in the inhibitory effects of Thymus vulgaris (Labiatae) monoterpenes on seed germination},
	journal = {Oecologia},
	volume = {101},
	year = {1995},
	note = {From Duplicate 1 (                           Intra-Specific Variation in the Inhibitory Effects of Thymus-Vulgaris (Labiatae) Monoterpenes on Seed-Germination                         - Tarayre, M; Thompson, J D; Escarre, J; Linhart, Y B )                
PT: J
        
},
	month = {1995/01//},
	pages = {110 - 118},
	address = {Affiliation: CNRS,Ctr Ecol.Fonct.\& Evolut., Rt Mende,34033 Montpellier, France},
	abstract = {The ecological role of plant secondary compounds has received a great deal of attention yet little is known regarding variation in the ecological significance of different compounds produced by a single species. This is particularly pertinent to species where variation in compound presence is under genetic control. In this study we have quantified variation in the inhibitory effects of the six dominant monoterpene oils produced by different genotypes (or chemotypes) of Thymus vulgaris on achene germination of an associated species (Brachy-podium phoenicoides), and seeds of T. vulgaris itself, in controlled experimental conditions. The experiments involved the germination of seeds of the two species with crushed leaves or pure essences of the six chemotypes, i.e. four experimental trials. A significant inhibitory effect against B. phoenicoides was found for both crushed leaves and the range of concentrations of purr oils used in the trial. The two phenolic compounds had a greater effect than the non-phenolic leaves and pure oils. The significant differences between non-phenols and the controls declined faster over time for crushed leaves and low concentrations of the pure essences than did that between the phenolics and the controls. There was a significant inhibitory effect against the germination of T. vulgaris seeds for the crushed leaves and the pure oils, although the contrast between the non-phenols and the phenols was not significant. The effect of the different oils varied depending on the seed source of the thyme seeds used in the trial. This is suggested to be due to differences in the rates of outcrossing among the sampled populations. The effects of the oils on the associated species, B. phoenicoides, were not found to be greater than their effects on the germination of thyme seeds. The results are discussed in the context of a potential role for such inhibitory effects in relation to the onset of rainfall and suitable germination conditions.},
	isbn = {0029-8549},
	url = {http://www.scopus.com/scopus/inward/record.url?eid=2-s2.0-0028977472\&partnerID=40\&rel=R6.5.0http://muse.lib.auth.gr:9797/com/csa/?MuseHost=www-mi2.csa.com\&MuseFirst=1\&id=2\&recnum=5\&SID=f6761d6ffa2f8c20dd10ff73e34434f8\&MusePath=/ids70/view_record.php},
	author = {Escarre, J and Linhart, Y B and Tarayre, M and Thompson, JD}
}
