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  • 1
    Electronic Resource
    Electronic Resource
    Weather conditions during nuptial flights of four European ant species (1981)
    Springer
    Oecologia 50 (1981), S. 236-241 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In 1977, 1978, and 1979 nuptial flights of Lasius niger L., Lasius flavus F., Myrmica rubra L., and Myrmica scabrinodis Nyl. were observed on the island of Schiermonnikoog and in the area around Amsterdam. Weather conditions during these flights were determined using data from meteorological stations at Schiermonnikoog and Schiphol Airport. Significant differences were found concerning daytime, global radiation and relative humidity at the beginning of flights of Lasius niger, Lasius flavus, and Myrmica rubra; Myrmica scabrinodis had no defined preferences for these parameters. Wind velocity at 2 m of height was less than 1.7 m.s−1 during all flights before 20 August. After that date all species tended to fly at higher wind velocities as well. The calculated ranges for daytime, temperature, global radiation, relative humidity, and wind velocity appeared to be sufficient to characterize all nuptial flight occasions at Schiermonnikoog. Micrometeorological measurements in typical habitats of different ant species revealed that during flights the air temperature at 20 cm above ground and the soil temperature at 5 to 7 cm below ground were about equal in the habitat of the flying species, but unequal in the neighbouring habitats of coexisting ants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00348045
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  • 2
    Electronic Resource
    Electronic Resource
    A new polygynousLasius species (Hymenoptera: Formicidae) from central Europe (1990)
    Springer
    Insectes sociaux 37 (1990), S. 363-375 
    Details
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Resume Nous avons récolté des échantillons deLasius (Lasius) neglectus spec. nov. dans la localité type à Budapest, Hongrie, pour effectuer une analyse des allozymes. Nous avons étudié quatre loci. Trois loci deL. neglectus sont monomorphes et différents deL. alienus. L'autre locus, l'enzyme malique (Me), est polymorphe chezL. neglectus. Ce locus a été utilisé afin d'étudier la viscosité de population, le coefficient de parenté entre ouvrières du même nid et les modalités d'accouplement. Les fréquences d'allèles sont homogènes entre les reines, les mâles et les ouvrières. Les fréquences de génotypes chez les ouvrières sont plus hétérogènes entre les nids et on peut détecter une certaine viscosité de la population. Dans les nids deL. neglectus, le coefficient de parenté entre ouvrières et entre ouvrières et mâles est très faible. Les reines semblent n'être inséminées que par un seul mâle. L'analyse de génotypes des ouvrières indique aussi l'existence d'une certaine consanguinité. En général, les résultats correspondent avec les observations sur le terrain (polygynie et accouplement dans le nid) (voirvan Loon et al., 1990). Nous comparons dans la discussion la structure sociale deL. neglectus avec celle de l'unique autre espèce deLasius s.s. polygyne connue (L. sakagamii).
    Notes: Summary The ant speciesLasius (Lasius) neglectus spec. nov. (van Loon et al., 1990) was sampled from its type locality in Budapest, Hungary for allozyme analysis at four marker loci.L. neglectus appeared to be monomorphic but different fromL. alienus at three loci. The fourth locus,Me, was found to be polymorphic inL. neglectus and was used to make a preliminary assessment of population viscosity, intranest relatedness, and mating structure. Allele frequencies turned out to be homogeneous across motherqueens, males and workers. Between sample sites, theMe allele frequencies of workers were more heterogeneous and some population viscosity could be detected. The mean intranest relatedness ofL. neglectus was found to be very low, both between workers and between workers and males, but no indications were found that queens are frequently inseminated more than once. The analysis of worker genotypes further showed a significant effect of inbreeding. The results are generally consistent with the observations about polygyny and intranidal mating reported byvan Loon et al. (1990). Some striking similarities betweenL. neglectus and the JapaneseL. sakagamii — the only other polygynousLasius s.s. known to science — are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02225998
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  • 3
    Electronic Resource
    Electronic Resource
    Relatedness and inbreeding in a French population of the unicolonial antIndomyrmex humilis (Mayr) (1992)
    Springer
    Insectes sociaux 39 (1992), S. 195-200 
    Details
    ISSN: 1420-9098
    Keywords: Argentine ant ; allozyme electrophoresis ; inbreeding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Worker and queen samples of the Argentine antIridomyrmex humilis were analysed using allozyme electrophoresis. Two loci,peptidase andglucosephosphate isomerase, were found to be stainable and polymorphic. Both revealed an estimated relatedness in nestmate females that was close to zero, which is a consequence of the strong polygyny in this species. The inbreeding coefficient was found to be close to zero, which can be explained, in spite of intra-nest mating taking place inI. humilis, by the high mobility of mated queens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01249294
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  • 4
    Electronic Resource
    Electronic Resource
    A new polygynousLasius species (Hymenoptera; Formicidae) from central Europe (1990)
    Springer
    Insectes sociaux 37 (1990), S. 348-362 
    Details
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Resume Une nouvelle espèce de fourmiLasius (Lasius) neglectus spec. nov. est écrite de Budapest, Hongrie. La morphologie des ouvrières ressemble à celle deL. alienus, mais les femelles et les mâles sont clairement distincts, avec des tailles plus petites. L'espèce est polygyne, sans frontières de nids évidentes, les vols nuptiaux semblent absents ou en tous cas rares et des accouplements entre partenaires d'un même nid ont été observés.L. neglectus ressemble par ces caractères à l'espèce polygyne japonaiseL. sakagamii. Les ouvrières recherchent en grand nombre les pucerons dans les arbres. Les auteurs postulent que la découverte récente deL. neglectus est peut-être due à son introduction artificielle à Budapest depuis une origine inconnue. Le statut spécifique de cette espèce est aussi confirmé par analye d'allozymes (Boomsma et al., 1990, article suivant).
    Notes: Summary A new ant speciesLasius (Lasius) neglectus spec. nov. is described from Budapest, Hungary. The workers are morphologically similar toL. alienus, but queens and males are clearly different and are much smaller. The species is polygynous, without apparent colony barriers, there are probably no nuptial flights, and intra-nidal mating has been observed; in this respectL. neglectus has several features in common with the polygynous Japanese speciesL. sakagamii. Workers forage in huge masses on aphids in tress. It is argued that the rather late discovery ofL. neglectus might be due to its arfificial introduction in Budapest from a yet unknown area. The status as a distinct species is further confirmed by allozyme data (Boomsma et al., 1990, next paper).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02225997
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  • 5
    Electronic Resource
    Electronic Resource
    Colony-level and season-specific variation in cuticular hydrocarbon profiles of individual workers in the ant Formica truncorum (1999)
    Springer
    Insectes sociaux 46 (1999), S. 58-65 
    Details
    ISSN: 1420-9098
    Keywords: Key words: Cuticular hydrocarbons, ants, gas chromatography, mass spectrometry.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary: Cuticular hydrocarbon profiles of individual workers of the ant Formica truncorum were measured and found to contain relatively few hydrocarbons. Pentacosane, heptacosane, nonacosane and hentriacontane dominated the mixture, but small amounts of the corresponding alkenes were also present. Principal component analysis and nested analysis of variance showed that workers from different colonies varied significantly in quantitative aspects of their cuticular hydrocarbon profiles. Furthermore, differences between habitat-patches within populations and (to some extent) between populations were also detected. Finally, workers from the same colony, sampled only a few months apart, were found to be different in the quantitative composition of their cuticular hydrocarbon profiles, emphasising the importance of collecting samples from a colony at a single point in time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000400050113
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  • 6
    Electronic Resource
    Electronic Resource
    Energy investment and respiration in queens and males of Lasius niger (Hymenoptera: Formicidae) (1985)
    Springer
    Behavioral ecology and sociobiology 18 (1985), S. 19-27 
    Details
    ISSN: 1432-0762
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Dry weight increase of queens and males of the ant Lasius niger after eclosion from pupa was estimated from sequential field samples of eight colonies. Queens increased from ca. 4 mg at eclosion to 15.5 mg at the time of nuptial flight, whereas males remained approximately constant at 0.9 mg (Fig. 1). Queen mesosoma and gaster increased in weight simultaneously up to a total of 13 mg. In queens in nuptial flight condition (≥13 mg) the weights of mesosoma+head and gaster were negatively correlated (Fig. 2). Energy investment in queens and males was estimated calorimetrically. The energy content of queens increased from ca 18.8 J/mg at 4 mg to 27.5 J/mg at 15.5 mg, largely due to the accumulation of fat reserves of 31 J/mg (Fig. 3). The energy content of males was so low (18.2 J/mg) that fat reserves were apparently negligible (Table 1). Oxygen consumption at 20°C was determined for larvae, pupae, and adults of queens and males (Table 2). Data on respiration and energy content were used to estimate the cumulative energy investment by workers per queen and male of Lasius niger from small larvae (〈0.3 mg) to flying adults. It was estimated that at least 90 J and 689 J are needed to produce one male and one queen, respectively. Assumptions and sources of error involved in the investment estimations, and the possible effect of a large size dimorphism in ant sexuals are discussed. Special reference is made to an earlier study on dry weight sexual investments in three Lasius niger populations (Table 3). Population means of sexual investments in queens are lower after applying the energetic queen-male cost ratio of this study, but remain in good agreement with theoretical kin selection optima. For the Lasius niger population in the most optimal habitat a better fit to the 3:1 optimum was found than by using dry weight estimation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00299234
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