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Chromosomal polymorphism in western Mediterranean populations of Drosophila subobscura

Published online by Cambridge University Press:  14 April 2009

Antonio Prevosti
Antonio Prevosti
Affiliation:
Laboratory of Genetics, Faculty of Sciences, University of Barcelona, Spain

Extract

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1. The frequency of the chromosomal types of several western Mediterranean populations of D. subobscura, distributed in a zone running north–south, is analysed and compared with that from an Edinburgh (Knight, 1961) site at a similar meridian as the Mediterranean populations.

2. North–south clines are found in the frequencies of several chromosomal types. Some types are more frequent in the north, decreasing gradually southwards; others show the reverse trend of variation.

3. The comparison with a similar array of populations from Central Europe and the Central Mediterranean area, indicates that the chromosomal types more frequent in the northern populations are mostly the same, i.e. the standard orders. But chromosomal types with complex inversion orders are the most frequent in southern populations: in some chromosomes, different orders are predominant in Israel, southern Italy and southern Spain.

4. The Pyrenees, acting as an ecological barrier, strongly influence the diversity of the populations north and south of the range. This result and the latitudinal clines support the adaptive significance of the chromosomal polymorphism in D. subobscura.

5. The index of free recombination of the population from Malaga (in the south of Spain) is higher than in the populations from the northern Mediterranean area. D. subobscura apparently supports the claims of da Cunha & Dobzhansky (1954) and Carson (1955) that a higher level of chromosomal polymorphism occurs in the central areas of the distribution of a species.

Type
Research Article
Information
Genetics Research , Volume 7 , Issue 2 , April 1966 , pp. 149 - 158
Copyright
Copyright © Cambridge University Press 1966

References

REFERENCES

Carson, H. L. (1955). The genetic characteristics of marginal populations of Drosophila. Cold Spring Harb. Symp. quant. Biol. 20, 276–287.CrossRefGoogle ScholarPubMed
Cunha, B. da & Dobzhansky, Th. (1954). A further study of chromosomal polymorphism in Drosophila willistoni in its relation to the environment. Evolution Lancaster, Pa. 7, 119–134.CrossRefGoogle Scholar
Dobzhansky, Th. & Epling, C. (1944). Contribution to the genetics, taxonomy and ecology of Drosophila pseudoobscura and its relatives. Carnegie Institution of Washington Publication 554.Google Scholar
Goldschmidt, E. (1958). Polymorphism and coadaptation in natural populations of Drosophila subobscura. Proc. Xth Int. Congr. Ent., Montreal, 2, 821–828.Google Scholar
Knight, G. R. (1961). Structural polymorphism in Drosophila subobscura Coll. from various localities in Scotland. Genet. Res. 2, 1–9.CrossRefGoogle Scholar
Kunze-Mühl, E. et al. (1958). Qualitative, quantitative und Jahreszeitliche Untersuchungen über den chromosomales Polymorphismus natürlicher Populationen von Drosophila subobscura Coll., in der Umbegung von Wien. Z. indukt. Abstamm- u. VererbLehre, 89, 636–646.Google Scholar
Kunze-mühl, E. & Sperlich, D. (1962). Vergleichende Untersuchungen über den chromosomalen Strukturpolymorphismus in Insel- und Festland-populationnen von Drosophila aubobscura. Z. indukt. Abstamm.- u. Vererb Lehre, 93, 237–248.Google Scholar
Prevosti, A. (1964 a). Chromosomal polymorphism in Drosophila subobscura populations from Barcelona (Spain). Genet. Res. 5, 27–38.CrossRefGoogle Scholar
Prevosti, A. (1964 b). Tipos cromosómicos de Drosophila subobscura en una población de Lagrasse (Francia). Genet. Iber. (in press).Google Scholar
Sperlich, D. (1961). Untersuchungen über den chromosomalen Polymorphismus einer Population von Drosophila subobscura auf den liparischen Inseln. Z. indukt. Abstamm.- u. VererbLehre, 92, 74–84.Google Scholar
Sperlich, D. (1964). Chromosomale Strukturanalyse und Fertilitätsprüfung an einer Marginal population von Drosophila aubobscura. Z. indukt. Abstamm.- u. VererbLehre, 95, 73–81.Google Scholar
Sperlich, D. & Kunze-Mühl, E. (1963). Der chromosomale Polymorphismus einer Population von Drosophila subobscura auf der Insel Ustica in Vergleich mit anderen Insel- und Festlands-tandorten. Z. indukt. Abstamm.- u. VererbLehre, 94, 94–100.Google Scholar
Stumm-Zollinger, E. (1953). Vergleichende Untersuchungen über die Inversionshaufigkeit bei Drosophila subobscura in Populationen der Schweiz and Südwest-Europa. Z. indukt. Abstamm- u. VererbLehre, 85, 382–407.Google Scholar
Stumm-Zollinger, E. & Goldschmidt, E. (1959). Geographical differentiation of inversion systems in Drosophila subobscura. Evolution, Lancaster, Pa. 13, 89–98.CrossRefGoogle Scholar