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  • 1
    Digitale Medien
    Digitale Medien
    Induced mimicry of colony odors in ants (1991)
    Springer
    Journal of chemical ecology 17 (1991), S. 1641-1664 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Formicinae ; mimicry ; artificial mixed colonies ; cuticular hydrocarbons ; colony recognition ; ants ; Hymenoptera ; Formicidae ; Formica selysi ; Monica rubida
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract The cuticular hydrocarbons ofFormica selysi (Formicinae) andMonica rubida (Myrmicinae) reared in single species and in mixed species colonies were determined using gas chromatography (GC) and GC-mass spectrometry. In colonies containing both species, each species modified its species-specific recognition odor. This odor is composed, at least partly, of cuticular hydrocarbons. The cuticular hydrocarbons ofM. rubida consist only of saturated alkanes (n-alkanes and branched alkanes). InF. selysi the mixture also contains unsaturated compounds (monoenes and dienes). In hetero-specific colonies, a new chemical signature developed. This signature resulted from qualitative and quantitative changes in the spectrum of hydrocarbons produced by each species and permitted the two species to inhabit the same nest without displaying interspecific aggression. The readjustment seemed to be more an active synthesis or an active transfer than simply a passive transfer from one species to the other. This may imply that the ants synthesized some components of the hydrocarbon signature of the other species. These synthesizing processes may be activated under particular social environmental conditions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00984695
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Mechanism underlying cuticular hydrocarbon homogeneity in the antCamponotus vagus (SCOP.) (Hymenoptera: Formicidae): Role of postpharyngeal glands (1995)
    Springer
    Journal of chemical ecology 21 (1995), S. 1127-1148 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Cuticular hydrocarbons ; chemical signature ; postpharyngeal glands ; nestmate recognition ; Hymenoptera ; ant ; Camponotus vagus
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract The aim of the present study was to investigate the regulation and the homogeneity of the chemical signature between members ofCamponotus vagus after experimentally changing the cuticular chemical signature by topically applying hydrocarbons. Topical application of pentane (solvent) to the cuticle of isolated workers led to a significant decrease in the quantities of the cuticular hydrocarbons measured within 3 hr, followed by an increase within the following 3 hr and a period of relative stability from 9 hr to 14 days. On the other hand, after topical application to isolated workers ofn-tetracosane, a hydrocarbon existing only in trace quantity in this species, the quantity of this hydrocarbon measured over time in the epicuticular wax tended to level out at about 14 days after treatment. In contrast, topically applied (Z)-9-tricosene, an unsaturated hydrocarbon not normally synthesized by this species, decreased dramatically within a few hours and had completely disappeared within 14 days. (Z)-9-Tricosene applied to one member of a group was present in the postpharyngeal glands of the other members from 30 min to seven days of cohabitation. The highest levels were recorded in all six workers in each group after one day. GC-MS analyses showed that (Z)-9-tricosene was present in the cuticles of some untreated workers only after four and seven days of cohabitation with a treated worker. These data suggest: (1) that the deposited (Z)-9-tricosene decreased very quickly on the cuticle of the treated worker, although the total amount was spread over the cuticle and postpharyngeal gland and (2) that it was absorbed by the nontreated workers via the postpharyngeal glands during licking or grooming activities and reincorporated into the cuticle at four and seven days. When the treated worker was separated from the other ants by a wire mesh, (Z)-9-tricosene was detected neither in the cuticle nor in the postpharyngeal gland of nontreated workers.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02228316
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Role of plant volatiles in the search for a host by parasitoidDiglyphus isaea (Hymenoptera: Eulophidae) (1996)
    Springer
    Journal of chemical ecology 22 (1996), S. 541-558 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Parasites ; volatile signals ; synomone ; host detection ; Hymenoptera ; Eulophidae ; Diglyphus isaea
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Diglyphus isaea Walker is a larval ectoparasitoid used in biological pest control against the American serpentine leaf minerLiriomyza trifolii Burgess. We studied the parasitoid's host searching behavior, using olfactometric methods. Our data show that the parasitoids locate host larvae (a leafmining dipteran) on the basis of volatile signals released by the plant-host complex. FemaleD. isaea are strongly attracted to the odors arising from damaged bean plants, whereas they show practically no response to intact plants. The results of our chemical analyses showed that about 15 components were present, two of which,cis-3-hexen-1-ol and 4-hydroxy-4-methyl-2-pentanone, were present in significantly larger quantities in the leaf extracts from mined or damaged bean plants than in those from healthy plants. The damage inflicted by the host larvae on these plants triggers the release of larger amounts of these substances, which probably lead the parasites to their hosts. The compounds thus act as synomones.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02033654
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Alkenes as a Sexual Pheromone in the Alfalfa Leaf-Cutter Bee Megachile rotundata (1999)
    Springer
    Journal of chemical ecology 25 (1999), S. 471-490 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Hymenoptera ; Apoidea ; Megachile rotundata ; solitary bee ; cuticular hydrocarbons ; sexual behavior of males
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Because of its special biological features, the leaf-cutter bee Megachile rotundata is particularly well suited for breeding and use as a pollinator for fodder plants such as alfalfa. Its mating behavior has been extensively studied. Behavioral tests have shown that males explore any black spot as a potential mating partner. However, exclusive selection of young virgin females suggests involvement of olfactory cues in addition to visual stimuli. Experiments demonstrated that mating behavior could be induced in males by lures covered with pentane extracts of the epicuticular waxes of young females. These extracts contain 35% fatty acids, 26% alkanes, and 39% monoenes. Variations in the monoene subfraction allow distinction between young virgin females, which possess more 7-pentacosene and 9-pentacosene, and older females, which have more 5-monoenes. The findings show that male mate-seeking and copulatory activity is stimulated only by young female monoenes. A 40% increase in this activity was observed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1020993518226
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Sex recognition inDiglyphus isaea walker (Hymenoptera: Eulophidae): Role of an uncommon family of behaviorally active compounds (1996)
    Springer
    Journal of chemical ecology 22 (1996), S. 2063-2079 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Hymenoptera ; Eulophidae ; Diglyphus isaea ; courtship behavior ; contact pheromones
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract The sexual behavior of the ectoparasitoidDiglyphus isaea is described. Recognition of the female by the male occurs at close range. Males initiate courtship behavior in the presence of a living female regardless of age, as well as in the presence of a female killed by freezing. Courtship behavior is not observed in the presence of a dead female washed with organic solvents but could be elicited using a lure covered with a female organic extract. These findings demonstrate that each sex develops a specific chemical signature that can be dissolved in hexane and transferred to a lure. Analysis of organic extracts by gas chromatography revealed chemical dimorphism between the two sexes. Gas chromatography coupled with mass spectrometry showed that the main components in females were esters of medium-chain fatty acids and long-chain 11-alcohols. There were few hydrocarbons. Female esters, which were present in only small proportions in males, were recovered in the nonhydrocarbon fraction obtained after fractionation of the total extract on a silica-filled microcolumn as a mixture containing 11-heneicosyl, 11-docosyl, 11-tricosyl, 11-tetracosyl, and 11-pentacosyl octanoate, and 11-docosyl, 11-tricosyl, 11-tetracosyl, and 11-pentacosyl decanoate. These results demonstrate that there is a specific gender-related chemical signature.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02040095
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Volatile secretion of dufour gland of workers of an army ant,Dorylus (Anomma) molestus (1991)
    Springer
    Journal of chemical ecology 17 (1991), S. 1633-1639 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Exocrine secretion ; Dufour gland ; Dorylus (Anomma) molestus ; Dorylus (Anomma) nigricans ; Dorylinae ; Formicidae ; Hymenoptera
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract The Dufour glands of workers ofDorylus (Anomma) molestus contain chiefly linear alkenes and alkanes, with (Z)-9-tricosene and tricosane representing over 70%. The glands are relatively small with some indication of very small (nanogram or less) amounts of dihydrofarnesol. Minima, medium, and major workers ofDorylus (Anomma) nigricans contain a similar spectrum of compounds.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00984694
    Standort Signatur Einschränkungen Verfügbarkeit
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