Light intensity as a factor in the choice of an oviposition site by Drosophila pseudoobscura and Drosophila persimilis

1983 ◽  
Vol 25 (4) ◽  
pp. 370-377 ◽  
Author(s):  
Dennis J. Wogaman ◽  
Marvin B. Seiger
Keyword(s):  
Light Intensity ◽  
Genetic Variability ◽  
Sibling Species ◽  
Light Response ◽  
Drosophila Pseudoobscura ◽  
Isofemale Lines ◽  
Sympatric Populations ◽  
Allopatric Populations ◽  
Behavioral Differentiation ◽  
Drosophila Persimilis

Light preferences for ovipositing of the sibling species Drosophila pseudoobscura and D. persimilis were measured in a multichoice chamber. Behavioral differentiation was found among sympatric populations of D. pseudoobscura and D. persimilis and between allopatric populations of D. pseudoobscura. Differences among isofemale lines within populations indicated genetic variability for the behavior. Both D. pseudoobscura populations were less fecund in a uniform light environment than in the multichoice environment while D. persimilis showed no difference in fecundity in the two environments. The patterns for general photoresponse and ovipositional light response were shown to be different for each population. Thus, the motivation to oviposit may affect photopreference differentially in each population.

scholarly journals GENIC HETEROGENEITY AT TWO ALCOHOL DEHYDROGENASE LOCI IN DROSOPHILA PSEUDOOBSCURA AND DROSOPHILA PERSIMILIS

Genetics ◽  
1977 ◽  
Vol 87 (2) ◽  
pp. 285-304
Author(s):  
Jerry A Coyne ◽  
Alexander A Felton
Keyword(s):  
Alcohol Dehydrogenase ◽  
Sibling Species ◽  
Genetic Divergence ◽  
Xanthine Dehydrogenase ◽  
The Other ◽  
Drosophila Pseudoobscura ◽  
Main Body ◽  
Striking Increase ◽  
Drosophila Persimilis ◽  
Octanol Dehydrogenase

ABSTRACT A sequential electrophoretic survey of the second chromosome loci, alcohol dehydrogenase-6 (Adh-6) and octanol dehydrogenase (Odh), was performed on 147 isochromosomal lines of Drosophila pseudoobscura and 60 lines of its sibling species, D. persimilis. Gels run with a variety of acrylamide concentrations and buffer pH's revealed the presence of 18 alleles of Adh-6 in the two species, where only eight had been previously detected by conventional electrophoretic methods. Only two alleles were added with our techniques to the previous total of nine in both species at the largely monomorphic Odh locus. Both enzymes show a predominance of one allele, with the other variants being fairly rare. There was no evidence of increased genetic divergence between the two species, but we found a striking increase in differentiation of Adh-6 alleles between the main body of D. pseudoobscura populations and the conspecific isolate from Bogotá, Colombia. These results are compared with our previous surveys of xanthine dehydrogenase in these species and discussed in reference to theories of genic polymorphism.

Selection for light preference during ovipositing in Drosophila pseudoobscura

1983 ◽  
Vol 25 (5) ◽  
pp. 446-449 ◽  
Author(s):  
Marvin B. Seiger ◽  
Amelia Broach Sanner
Keyword(s):  
Light Intensity ◽  
Genetic Variability ◽  
High Light Intensity ◽  
High Light ◽  
Drosophila Pseudoobscura ◽  
Low Light ◽  
Original Population ◽  
Low Light Intensity ◽  
Light Intensities ◽  
Light Preference

Selection was carried out on a population of Drosophila pseudoobscura to obtain lines preferring high-light intensity or low-light intensity during oviposition. This species is generally characterized as preferring low-light intensities. It was possible to select for increased preference for high-light intensity, but not for low-light intensity during oviposition. However, additive genetic variability exists in preferences for both high- and low-light intensities. The original population was probably operating at a photonegative extreme for oviposition, yet maintained enough genetic variability to permit selection toward a photopositive preference.

scholarly journals LACK OF GENIC SIMILARITY BETWEEN TWO SIBLING SPECIES OF DROSOPHILA AS REVEALED BY VARIED TECHNIQUES

Genetics ◽  
1976 ◽  
Vol 84 (3) ◽  
pp. 593-607
Author(s):  
Jerry A Coyne
Keyword(s):  
Genetic Variability ◽  
Sibling Species ◽  
Gel Electrophoresis ◽  
Electrophoretic Analysis ◽  
Xanthine Dehydrogenase ◽  
Gene Frequencies ◽  
Geographic Populations ◽  
Electrophoretic Techniques ◽  
Drosophila Persimilis

ABSTRACT Acrylamide gel electrophoresis was performed on the enzyme xanthine dehydrogenase in sixty isochromosomal lines of Drosophila persimilis from three geographic populations. Sequential electrophoretic analysis using varied gel concentrations and buffers revealed twenty-three alleles in this species where only five had been described previously. These new electrophoretic techniques also detected a profound increase in divergence of gene frequencies at this locus between D. persimilis and its sibling species D. pseudoobscura. The implications of these results for questions of speciation and the maintenance of genetic variability are discussed.

scholarly journals GENE DIFFERENCES BETWEEN THE SEX RATIO AND STANDARD GENE ARRANGEMENTS OF THE X CHROMOSOME IN DROSOPHILA PERSIMILIS

Genetics ◽  
1977 ◽  
Vol 85 (3) ◽  
pp. 507-511
Author(s):  
David Policansky ◽  
E Zouros
Keyword(s):  
Sex Ratio ◽  
X Chromosome ◽  
Sibling Species ◽  
Banding Pattern ◽  
Allele Frequencies ◽  
Drosophila Pseudoobscura ◽  
Linkage Equilibrium ◽  
Drosophila Persimilis ◽  
The Right

ABSTRACT The sibling species Drosophila pseudoobscura and D. persimilis each carry two gene arrangements in the right arm of the X chromosome; Standard (ST) and Sex Ratio (SR). The SR sequence of D. persimilis and the ST sequence of D. pseudoobscura have the same banding pattern. These cytologically identical arrangements carry different alleles at the esterase-5 (Est-5) and phosphoglucomutase-1 (Pgm-1) loci. All the alleles on the SR arrangement of D. persimilisare also present on the ST arrangement of that species, and the same allele was most common in all cases. However, the allele frequencies at the Pgm-1 locus are significantly different between the two arrangements. Within the ST arrangement of D. persimilis, the alleles at the Est-5 and Pgm-1 loci are in linkage equilibrium.

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