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  • 1
    Electronic Resource
    Electronic Resource
    Two-way selection for mating activity in the Mediterranean fruit fly, Ceratitis capitata (1988)
    Springer
    Entomologia experimentalis et applicata 47 (1988), S. 239-248 
    Details
    ISSN: 1570-7458
    Keywords: Mediterranean fruit fly ; Ceratitis capitata ; mating activity ; courtship ; genetics ; startle activity ; quality control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Aucune variation significative n'a été observée dans les activités sexuelles de huit souches de laboratoire de la mouche méditerranéenne du fruit, Ceratitis capitata (Wiedemann) (Diptera Tephritidae). Deux méthodes ont été utilisées pour sélectionner des souches manifestant une activité sexuelle basse ou élevée: une technique utilisant un seul couple (SP), basée sur la durée de la période avant copulation, et une technique de masse (M), basée sur un ‘index d'accouplement’. Des appariements réciproques entre les lignées rapides et lentes ont montré que la différence entre les lignées SP était déterminée par les femelles, tandis que la différence entre les lignées M résultait du comportement des deux sexes. La sélection M, quelle que soit sa direction, affects deux paramètres, la ‘distance entre partenaires lors de la vibration’ et la ‘durée de la vibration’ qui tous deux tendent à se raccourcir. La sélection M est aussi associée à une réduction de la réaction des femelles à un brusque stimulus lumineux (‘Startle activity’).
    Notes: Abstract No significant variation in mating activity was observed among eight laboratory strains of the Mediterranean fruit fly (medfly), Ceratitis capitata (Wiedemann) (Diptera: Tephritidae). Two methods were used to select strains showing high and low mating activity: a single pair technique (SP) assessing ‘time to mating’ and a mass technique (M) based on a ‘mating index’. Reciprocal pairings between fast and slow selected lines showed that the difference between the SP lines was female-determined whereas the difference between the M lines depended on the behaviour of both sexes. M selection, irrespective of its direction, affected two courtship parameters, ‘vibration distance’ and ‘vibration duration’ both of which tended to be shorter. M selection was also associated with a reduction in ‘startle activity’ in females.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00352210
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Essential-Oil-Mediated Interactions Between Oregano Plants and Helicidae Grazers (1998)
    Springer
    Journal of chemical ecology 24 (1998), S. 1187-1202 
    Details
    ISSN: 1573-1561
    Keywords: Carvacrol ; foraging cycle ; Mediterranean-type ecosystems ; Origanum vulgare ; snails ; terrestrial gastropods ; Helix ; Eobania
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Aromatic plants dominate in Mediterranean-type ecosystems. They often produce remarkable quantities of essential oils containing high amounts of phenolic isoprenoids, such as thymol and carvacrol. The purpose of this work was to examine the interactions between commonly occurring aromatic plants in the Mediterranean environment and their snail grazers. The aromatic plants used were two Origanum vulgare subspecies, subsp. hirtum and subsp. vulgare. They differ in the content and the qualitative composition of their essential oil; subsp. hirtum contains a much larger amount and is rich in phenolic compounds. Their effect on the foraging behavior of three snail species, native in Greece, was studied; the snail species were Helix lucorum, H. aspersa, and Eobania vermiculata. The snails' responses to different food sources, raw or processed, with or without essential oils, were evaluated during the different stages of the foraging cycle. During the encounter stage, snails were more repelled than attracted when close to phenol-rich foods. During the acceptance stage, all snail species tended to reject food types that contained high concentrations of subsp. hirtum essential oil. At the feeding stage, subsp. hirtum essential oil caused reduction of daily consumption rates. Overall, the essential oil of O. vulgare subsp. vulgare did not produce any marked change in the snails' behavior. In contrast, that of O. vulgare subsp. hirtum had a repellent effect, particularly when present in naturally occurring high concentrations. Among the snail species, H. lucorum, which does not share the same biotope with O. vulgare subsp. hirtum, was the least tolerant to its essential oil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022446919104
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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