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  • 1
    Electronic Resource
    Electronic Resource
    Giemsa C-banding patterns in Aedes (Stegomyia) mosquitoes (1978)
    Springer
    Chromosoma 70 (1978), S. 51-58 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Chromosomes from gonads of 14–24 h old pupae of nine species of Stegomyia mosquitoes have been examined using the Giemsa C-banding technique. The species studied were Aedes albopictus, A. polynesienis, A. scutellaris, A. alcasidi, A. seatoi, A. pseudalbopictus, A. melallicus, A. annandalei and A. vittatus. The diploid chromosome number of all species is six. All species possess C-bands in the centromeric regions of each of the three pairs of chromosomes. Besides, an intercalary C-band is present on the female determining (=m) chromosome but absent from the male—determining (= M) chromosome of all species except A. vittatus. In A. vittatus, the m and M chromosomes possess a terminal C-band. Thus, the nine species of Aedes analysed showed two distinct patterns of C-banding. —The evolution of heterochromatin patterns in various species is also discussed. The Giemsa C-banding technique should prove useful in studies of chromosomal speciation in culicine mosquitoes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00292215
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  • 2
    Electronic Resource
    Electronic Resource
    Aedes Albopictus in the Americas (1991)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Entomology 36 (1991), S. 459-484 
    Details
    ISSN: 0066-4170
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.en.36.010191.002331
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  • 3
    Electronic Resource
    Electronic Resource
    Radiation Sterilization of Aedes aegypti in Nitrogen and Implications for Sterile Male Technique (1973)
    [s.l.] : Nature Publishing Group
    Nature 244 (1973), S. 368-369 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It has been observed that the effects of irradiation on living organisms may be modified by changing the internal environment of the cell experimentally, Thoday and Read3 decreased the oxygen concentration in irradiated Vicia faba and found a lower mutation frequency. Hollander, Baker and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/244368a0
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  • 4
    Electronic Resource
    Electronic Resource
    Intraspecific variation in nuclear DNA content among world populations of a mosquito, Aedes albopictus (Skuse) (1990)
    Springer
    Theoretical and applied genetics 79 (1990), S. 748-752 
    Details
    ISSN: 1432-2242
    Keywords: Feulgen cytophotometry ; Intraspecific ; DNA content ; Aedes albopictus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Aedes albopictus is commonly distributed in most parts of the Oriental region and on many islands in the Indian and the Pacific Oceans. The species was recently introduced into the United States and Brazil. Feulgen cytophotometric quantitation of haploid nuclear DNA content was carried out for 37 populations of Ae. albopictus to determine the extent of intraspecific variation in nuclear DNA content and whether the range expansion of the species has coincided with an increase in DNA content. The haploid nuclear DNA content varied nearly three-fold. The minimum DNA content was 0.62 pg in Koh Samui from Thailand, and the maximum DNA content was 1.66 pg in Houston-61 from the United States. Statistical comparisons of populations revealed significant differences in DNA contents. No geographic clustering of populations was noted with respect to DNA content. In general, populations from the United States and Brazil had higher DNA contents, but there was no indication that the range expansion had occurred hand in hand with an increase in DNA content. Each population had a specific amount of DNA that is probably imposed by the microenvironment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224239
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  • 5
    Electronic Resource
    Electronic Resource
    Conservation of a highly repeated DNA family of Aedes albopictus among mosquito genomes (Diptera: Culicidae) (1992)
    Springer
    Theoretical and applied genetics 83 (1992), S. 557-564 
    Details
    ISSN: 1432-2242
    Keywords: Repetitive DNA ; Genomic organization ; Chromosomal localization ; DNA sequence ; Mosquitoes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The genomic organization and chromosomal localization of a cloned 0.79-kb highly repeated DNA fragment, H-115, isolated from Aedes albopictus has been examined. The cloned fragment is a part of a larger unit of 1.86 kb that is tandemly repeated in the Ae. albopictus genome. The H-115 family of sequences are located at the intercalary position on chromosome 1 in Ae. albopictus. Similar patterns of in situ and Southern blot hybridization results are obtained in Ae. aegypti, Ae. seatoi, Ae. flavopictus, Ae. polynesiensis, Ae. Alcasidi, and Ae. katherinensis. The H-115 sequences are widely conserved in Culicidae and are found in Haemagogus equinus, Tripteroides bambusa, and Anopheles quadrimaculatus by hybridization under high stringency conditions. The H-115 sequences are also tandemly repeated in Hg. equinus with a monomer unit of 1.86 kb and in Tp. bambusa with a slightly diverged monomer unit of 1.90kb. In Anopheles quadrimaculatus, the H-115 sequences are dispersed throughout the genome. Partial sequence analysis shows that the H-115 insert is 62% AT and contains two perfect inverted repeats and numerous perfect direct repeats. The occurrence of inverted repeats with potential to form intrastrand palindromic structure suggests that the H-115 family of sequences may be involved in chromatin condensation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226899
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  • 6
    Electronic Resource
    Electronic Resource
    Patterns of morphometric and allozyme variation in Aedes albopictus (1991)
    Springer
    Entomologia experimentalis et applicata 60 (1991), S. 193-201 
    Details
    ISSN: 1570-7458
    Keywords: Aedes albopictus ; morphometrics ; allozyme analysis ; multivariate analysis ; congruency analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A survey of microgeographic variation using morphometric and allozyme analyses was conducted on 19 US populations of Aedes albopictus (Skuse) (Diptera: Culicidae), a mosquito that was recently introduced into the US. There was considerable variation within and among populations both in morphometric traits and allele frequencies. A multivariate discriminant analysis enabled the separation of populations into distinct groups; separation among the populations in the morphometric analysis was incomplete with an average of 70% of the individuals being correctly classified. In the allozyme analysis, the discrimination was complete. The populations from Texas were placed close together in the morphometric analysis, whereas in the allozyme analysis a geographic clustering of populations could not be detected. A test of association between the distance matrices derived from the morphometric and allozyme analyses was statistically nonsignificant. The results are discussed in the context of the colonization of the US by A. albopictus. The possible factors underlying the differences in the patterns of variation derived from morphometric and allozyme analyses are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00177040
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  • 7
    Electronic Resource
    Electronic Resource
    Evolutionary cytogenetics of Aedine mosquitoes (1984)
    Springer
    Genetica 52-53 (1984), S. 281-290 
    Details
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00121838
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  • 8
    Electronic Resource
    Electronic Resource
    Population differentiation in Collinsia verna Nuttal (Scrophulariaceae): a multifaceted approach (1986)
    Springer
    Genetica 71 (1986), S. 51-61 
    Details
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Three species of Collinsia (commonly called Blue-eyed Mary, Innocence, Chinese Houses) including 12 populations of C. verna were examined for genetic variability and differentiation using three investigative techniques: enzyme electrophoresis, chiasma frequencies, and morphological measurements. Analysis of isozyme data showed higher heterozygosity was maintained in the C. verna populations (previously reported to be self pollinating) than in C. heterophylla and C. tinctoria, which are outcrossers. C. heterophylla and C. tinctoria were separated by a significant genetic distance from each other and especially from C. verna. Within C. verna isozyme, morphological, and chiasma frequency analyses separated the populations into subsets showing some geographical trends, possibly influenced by water dispersal of seeds. High genetic variability was maintained and differentiation has occured in the C. verna populations. The explanation may lie in a combination of factors associated with the ‘heterozygosity paradox’ including microgeographical influence and inappropriate mating system classification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00123233
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  • 9
    Electronic Resource
    Electronic Resource
    Genetics of speciation in the Aedes (Stegomyia) scutellaris group (Diptera: Culicidae) V. Chromosomal relationships among five species (1984)
    Springer
    Genetica 64 (1984), S. 83-92 
    Details
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A comparison was made of karyotypes of 5 species in the Aedes scutellaris group and their hybrids. All species had 3 distinct pairs of metacentric chromosomes (2n=6). These were of similar lengths in Ae: malayensis and Ae. alcasidi, and in Ae. polynesiensis and Ae. pseudoscutellaris. However, chromosome 1 in Ae. polynesiensis and Ae. kesseli, and chromosome 2 in Ae. pseudoscutellaris and Ae. kesseli were of unequal lengths. Meiotic analyses revealed that chromosome asynapsis was frequently seen in species hybrids. There was a significant variation in chiasma frequencies between species and their hybrids. However, the mean chiasma frequency was species specific. In addition, the mean chiasma frequency of species hybrids and the extent of chromosomal asynapsis provided a measure of genetic homology between species. Based on the assumption that a dicentric bridge and an acentric fragment were due to a single crossover within a paracentric inversion loop the following conclusions are made. Ae. malayensis and Ae. alcasidi are polymorphic for one paracentric inversion in chromosome 1. Ae. polynesiensis and Ae. pseudoscutellaris, and Ae. pseudoscutellaris and Ae. kesseli are fixed for one paracentric inversion in chromosome 2. Similarly, Ae. polynesiensis and Ae. kesseli are fixed for one paracentric inversion in chromosome 1. These chromosomal differences between species are discussed with respect to hybrid fertility data reported earlier.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00120258
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  • 10
    Electronic Resource
    Electronic Resource
    Linkage relationships of eleven enzyme loci in the Aedes scutellaris group (1983)
    Springer
    Biochemical genetics 21 (1983), S. 1195-1201 
    Details
    ISSN: 1573-4927
    Keywords: Aedes polynesiensis ; Aedes kesseli ; linkage group
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Linkage relationships of 11 enzyme loci were determined in backcrosses between Aedes polynesiensis and Aedes kesseli. Three linkage groups established were Aat2-Lap2-Me-Sex, Cat-Ao-Pgm-Idh2-Est6, and Gpi-Odh-Pgd. Lap2 and Cat have not been previously mapped in Aedes. Locus order and linkage groups were the same as those observed for seven loci mapped in Aedes aegypti. The significance of the observed similarities in chromosome organization and differences in crossover values among closely related Aedes are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00488470
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