Abstract
We have studied seasonal variation (spring, early summer, last summer and autumn) of inversion polymorphisms of the O chromosome of Drosophila subobscura in a natural population over 15 years. The length of the study allowed us to investigate the temporal behavior (short-term seasonal changes and long-term directional trends) of the O arrangements by the powerful statistical method of time series analysis. It is shown that the O inversion polymorphisms varied on two different time scales: short-term seasonal changes repeated over the years superimposed on long-term directional trends. All the common arrangements (O(3+4+7), O(ST), O(3+4) and O(3+4+8)) showed significant cyclic seasonal changes, and all but one of these arrangements (O(3+4+7)) showed significant long-term trends. Moreover, the degree of seasonality was different for different arrangements. Thus, O(3+4+7) and O(ST) showed the highest seasonality, which accounted for ~61 and 47% of their total variances, respectively. The seasonal changes in the frequencies of chromosome arrangements were significantly associated with the seasonal variation of the climate (temperature, rainfall, humidity and insolation). In particular, O(3+4+7) and O(ST), the arrangements with the greatest seasonal component, showed the strongest association with all climatic factors investigated, especially to the seasonal changes of extreme temperature and humidity.
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Selected References
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- Dobzhansky T., Ayala F. J. Temporal frequency changes of enzyme and chromosomal polymorphisms in natural populations of Drosophila. Proc Natl Acad Sci U S A. 1973 Mar;70(3):680–683. doi: 10.1073/pnas.70.3.680. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Dobzhansky T. Genetics of Natural Populations IX. Temporal Changes in the Composition of Populations of Drosophila Pseudoobscura. Genetics. 1943 Mar;28(2):162–186. doi: 10.1093/genetics/28.2.162. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Dowse H. B., Hall J. C., Ringo J. M. Circadian and ultradian rhythms in period mutants of Drosophila melanogaster. Behav Genet. 1987 Jan;17(1):19–35. doi: 10.1007/BF01066008. [DOI] [PubMed] [Google Scholar]
- Fontdevila A., Zapata C., Alvarez G., Sanchez L., Méndez J., Enriquez I. Genetic Coadaptation in the Chromosomal Polymorphism of DROSOPHILA SUBOBSCURA. I. Seasonal Changes of Gametic Disequilibrium in a Natural Population. Genetics. 1983 Dec;105(4):935–955. doi: 10.1093/genetics/105.4.935. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Gosteli M. Chromosomal polymorphism in natural populations of Drosophila subobscura near Zürich, Switzerland: a contribution to long-term comparisons. Genetica. 1990;81(3):199–204. doi: 10.1007/BF00360865. [DOI] [PubMed] [Google Scholar]
- Krimbas C. B. The genetics of Drosophila subobscura populations. 3. Inversion polymorphism and climatic factors. Mol Gen Genet. 1967;99(2):133–150. doi: 10.1007/BF00426158. [DOI] [PubMed] [Google Scholar]
- Moltó M. D., Pascual L., Martínez-Sebastián M. J., de Frutos R. Genetic analysis of heat shock response in three Drosophila species of the obscura group. Genome. 1992 Oct;35(5):870–880. doi: 10.1139/g92-132. [DOI] [PubMed] [Google Scholar]
- Mueller L. D., Barr L. G., Ayala F. J. Natural selection vs. random drift: evidence from temporal variation in allele frequencies in nature. Genetics. 1985 Nov;111(3):517–554. doi: 10.1093/genetics/111.3.517. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Quintana A., Prevosti A. Genetic and environmental factors in the resistance of Drosophila subobscura adults to high temperature shock. III. Chromosomal-inversion and enzymatic polymorphism variation in lines selected for heat shock resistance. Genetica. 1991;84(3):165–170. doi: 10.1007/BF00127243. [DOI] [PubMed] [Google Scholar]
- STUMM-ZOLLINGER E. Vergleichende Untersuchung über die Inversionshäufigkeit bei Drosophila subobscura in Populationen der Schweiz und Südwesteuropas. Z Indukt Abstamm Vererbungsl. 1953;85(3):382–407. [PubMed] [Google Scholar]
- Wright S. Systems of Mating. I. the Biometric Relations between Parent and Offspring. Genetics. 1921 Mar;6(2):111–123. doi: 10.1093/genetics/6.2.111. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Wright S. The Theory of Path Coefficients a Reply to Niles's Criticism. Genetics. 1923 May;8(3):239–255. doi: 10.1093/genetics/8.3.239. [DOI] [PMC free article] [PubMed] [Google Scholar]