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  • 1980-1984  (6)
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  • 1
    Publication Date: 1984-01-01
    Print ISSN: 0025-3162
    Electronic ISSN: 1432-1793
    Topics: Biology
    Published by Springer
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  • 2
    Publication Date: 1980-02-01
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 283 (1980), S. 604-604 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] FLESNESS1 has brought out the interesting fact that relatedness between diploids can be asymmetric, as it is between the sexes of male-haploids2. His note, however, contains a conceptual difficulty. This concerns the directionality of relatedness in his otherwise valuable definition. Because ...
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Marine biology 79 (1984), S. 99-100 
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Some common errors in testing the departure of genotype frequencies from Hardy-Weinberg (random mating) expectations are pointed out and the difference between testing genotype frequencies and heterozygosities is stressed. We note that a statistical comparison of the expected and observed heterozygosities in the population is complicated by positive correlation between the estimates of the two values.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Insectes sociaux 31 (1984), S. 375-386 
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Resume Les relations génétiques de huit espèces de guêpes d'Europe du nord, représentantVespula s. str. (le grouperufa),Paravespula (le groupevulgaris) etDolichovespula, sont étudiées ici par électrophorèse enzymatique. Le niveau de variation génétique intraspécifique observé est relativement bas, et les populations du sud de la Finlande ne montrent pas de différences géographiques nettes. Les caractères d'allozymes sont ensuite utilisés pour construire des arbres phylogénétiques par quatre techniques de construction. Il est suggéré queDolichovespula media n'est pas étroitement apparentée aux autres espèces deDolichovespula européens, et queParavespula etVespula s. str. ne forment peut-être pas un seul groupe monophylétique. Deux des espèces étudiées,V. austriaca etD. omissa, sont des parasites sociaux obligatoires. Dans les deux cas le parasite est apparenté à son hôte. Cela appuie l'hypothèse que le parasite social apparaît généralement à partir de la même souche ancestrale que l'espèce hôte.
    Notes: Summary Genetic relationships of eight northern European yellowjacket species, representingVespula s. str. (therufa group),Paravespula thevulgaris group) andDolichovespula, are here studied by enzyme electrophoresis. The observed level of intraspecific genic variation is relatively low, and the southern Finnish populations show no clear-cut geographic differences. The allozyme characters are further used to construct phylogenetic trees by four tree-building techniques. It is suggested thatDolichovespula media is not phylogenetically closely related to other EuropeanDolichovespula species, and thatParavespula andVespula s. str. may not form a single monophyletic group. Two of the species studied,V. austriaca andD. omissa, are obligatory social parasites. In both cases the parasite is related to its host. This supports the hypothesis that the social parasite generally arises from the same ancestral stock as the host species.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Behavioral ecology and sociobiology 15 (1984), S. 143-150 
    ISSN: 1432-0762
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We use a multiallelic regression and jack-knife technique to estimate relatedness and its confidence limits in a sample of 117 nests of the Australian arid zone ant Rhytidoponera mayri, using the genotypes at a prolifically-polymorphic amylase locus. Relatedness between workers from the same nest is low, whether calculated with respect to the complete sample of nests (b=0.121〈0.158〈0.195), or by restricting the analysis to those nests bordering a cell in a Gabriel-connectedness graph (b=0.101〈0.126〈0.151). Relatedness between workers of neighboring nests was determined for nearest-neighbors (b=0.021〈0.054〈0.087), and for nests connected in the Gabriel network (b=0.018〈0.036〈0.054). Relatedness is thus low but significant at both within- and between-nest levels, as is consistent with a life history involving multiple egg-layers and colony foundation via fission. Estimating relatedness for the different alleles separately yields some significant differences between alleles. We also tested for geographic substructuring using autocorrelation analysis of nine alleles separately and the factor scores for the first two principal components of all the allele frequencies: six of the eleven patterns tested differed significantly from randomness at the 95% level.
    Type of Medium: Electronic Resource
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