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  • 1
    Electronic Resource
    Electronic Resource
    Size discrimination among conspecific hostplants in two pierid butterflies; Pieris napi L. and Pontia daplidice L. (1987)
    Springer
    Oecologia 72 (1987), S. 52-57 
    Details
    ISSN: 1432-1939
    Keywords: Pieris ; Pontia ; Plant-animal-interactions ; Herbivores ; Foodplant discrimination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Females of the butterflies Pieris napi and Pontia daplidice discriminate against large hostplant individuals, usually preferring low rosettes or seedlings, when hostplants are abundant. In this paper the larval mobility between young hostplant, and differences in survival and growth rate on low versus tall conspecific hostplants were studied in these two species in Sweden. The results suggest that the largest effect of plant size is that small plants support faster growth than bigger ones. This seems to be due to differences in microclimate conditions, not an effect of different suitability as food. Thus, on the assumption that there are no systematic differences in larval death rate, which is supported by the results in this study, preference for small hostplants should be advantagous, leading to higher survival during development, and higher probability for an additional brood per year.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00385044
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Inheritance of Arabidopsis DNA in offspring from Brassica napus and A. thaliana somatic hybrids (1999)
    Springer
    Theoretical and applied genetics 98 (1999), S. 99-106 
    Details
    ISSN: 1432-2242
    Keywords: Key words Brassicaceae ; Back-crossed symmetric and asymmetric somatic hybrids ; RFLP analysis ; Chromosomes ; Intergenomic translocation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Chromosome counts and RFLP markers mapped to Arabidopsis thaliana were used to determine the proportion of eliminated chromosomes and retained A. thaliana DNA in the back-crossed (BC) progeny derived from symmetric and asymmetric somatic hybrids between Brassica napus and A. thaliana. All plants were analysed for the presence of two RFLP markers per chromosome, preferably with one located on each chromosome arm. A reduction in both A. thaliana RFLP markers and chromosome numbers was found in the BC1 and BC2 generations of the symmetric hybrids as well as in the BC1 generation of the asymmetric hybrids. In the symmetric hybrids, two back-crosses to B. napus were required to reduce the frequency of retained A. thaliana loci to 42.4% and mean chromosome number to 39.4. In comparison, the BC1 progeny of the asymmetric hybrids had 16% of the analysed A. thaliana loci present and an average of 38.4 chromosomes maintained. When the frequency of A. thaliana chromosomes with both analysed loci maintained was compared with the frequency of chromosomes with one locus lost and one kept, a reduction in the number of complete chromosomes between BC1 and BC2 derived from the symmetric hybrids was observed. Among the BC1 plants in the asymmetric group the situation was different, with higher amounts of incomplete donor chromosomes compared to whole chromosomes. The results indicate that A. thaliana chromosome fragments are more often found in the progeny of irradiated hybrids, while back-crossed symmetric hybrids have more complete chromosomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051045
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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