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  • 1
    Electronic Resource
    Electronic Resource
    Cantharidin analogues and their attractancy for ceretopogonid flies (Diptera: Ceratopogonidae) (1992)
    Springer
    Cellular and molecular life sciences 48 (1992), S. 106-111 
    Details
    ISSN: 1420-9071
    Keywords: Cantharidin ; Ceratopogonidae ; Atrichopogon oedemerarum ; attractancy ; structure-activity relationship
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Several ceratopogonid flies are attracted to cantharidin and ingest it from both cantharidin-baits and from meloid beetles, one of the few known natural sources for cantharidin. Because meloids are absent in northern Bavaria, and certain canthariphilous flies of the genusAtrichopogon are temporarily associated with certain plants (Apiaceae, Aristolochiaceae), it was suggested that canthariphilous ceratopogonids might be generally attracted by chemically similar plant-derived compounds. At first the seasonal fluctuating attractancy, sex ratio and behaviour ofA. oedemerarum Storå was studied at cantharidin baits. Synthetic cantharidin analogues exhibited an attractancy forA. oedemerarum if the exo,exo-7-oxabicyclo[2.2.1]heptane skeleton of cantharidin was associated with a 2,3-dicarboxylic anhydride or a 2,3-γ-lactone. According to structure-activity studies, the analogues seem to fit best into the active site of the receptor if the carbonyl function of the γ-lacton is in the exo- and 2-position. This is the first report indicating that molecules other than cantharidin are attractive for canthariphilous insects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01923620
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Identification and biological significance of 4-methyl-3Z,5-hexadienoic acid produced by males of the gall-forming tephritidsUrophora cardui (L.) andUrophora stylata (Fab.) (Diptera: Tephritidae) (1990)
    Springer
    Cellular and molecular life sciences 46 (1990), S. 542-547 
    Details
    ISSN: 1420-9071
    Keywords: Tephritidae ; Urophora cardui (L.) ; Urophora stylata (Fab.) ; volatile ; 4-methyl-3Z,5-hexadienoic acid ; gas chromatography ; mass spectrometry ; quantitative analysis ; bioassay
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A new natural substance has been identified in the rectal ampullae of gall-forming fruit flies. The substance was found to be the only volatile compound in the rectal ampulla of maleUrophora cardui andUrophora stylata. GC-MS methods were used to characterize its structure as 4-methyl-3Z,5-hexadienoic acid. Physiological parameters such as the amount of the acid at different ages and under different conditions were investigated. The biological significance of the new volatile as an arresting pheromone was tested in several bioassays. The arrestant function could not be established, but the results gave hints of a territorial function between conspecific males. The results are discussed with respect to gland morphology and predictions of communication models among fruit flies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01954261
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Diversity and composition of phytophagous insect guilds on Brassicaceae (1998)
    Springer
    Oecologia 113 (1998), S. 391-399 
    Details
    ISSN: 1432-1939
    Keywords: Key words Feeding niche ; Host range ; Nitrogen ; Sampling effort
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We investigated the guild structure of phytophagous insects on Brassicaceae in Poland and the influence of host-plant parameters (e.g. sampling effort, geographical distribution, taxonomic isolation, nitrogen indicator values) on the species richness of these guilds. The data were extracted from a study published by Lipa et al. The overall number of recorded ectophagous species is about twice the number of endophagous species. Irrespective of the feeding niche, species are predominantly oligophagous, feeding on more than two Brassicaceae genera. The relative importance of endophagous species within the fauna decreases with increasing host range. The sampling effort predicts a high proportion of the variance of alpha-diversity in oligo- and polyphagous insects, but only a low proportion in specialized species. After correction for sampling effort, most of the plant parameters do not explain an additional proportion of the variance in species richness. We hypothesize that the uniform chemical defence system across genera in Brassicaceae is an important factor triggering host range and diversity patterns in phytophagous insects on crucifers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004420050391
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    Paper (German National Licenses)
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