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do males of drosophila littoralis have free recombination? 20113230029
genetic variation in the male courtship sound of drosophila littoralis. 20133838071
an old bilbo-like non-ltr retroelement insertion provides insight into the relationship of species of the virilis group.in drosophila, at the population and species level, fixation of a te insertion is an unlikely fate. of the few reported fixations at the species level most involve non-ltr retroelements. in this work we report the fixation of a non-ltr retroelement in five species (drosophila littoralis, drosophila virilis, drosophila lummei, drosophila americana and drosophila novamexicana) of the virilis group of drosophila. in most species, this te insertion is being lost through the accumulation of small del ...200818775768
adaptation of circadian neuronal network to photoperiod in high-latitude european drosophilids.the genus drosophila contains over 2,000 species that, stemming from a common ancestor in the old world tropics, populate today very different environments [1, 2] (reviewed in [3]). we found significant differences in the activity pattern of drosophila species belonging to the holarctic virilis group, i.e., d. ezoana and d. littoralis, collected in northern europe, compared to that of the cosmopolitan d. melanogaster, collected close to the equator. these behavioral differences might have been o ...201728262491
independence of genetic geographical variation between photoperiodic diapause, circadian eclosion rhythm, and thr-gly repeat region of the period gene in drosophila littoralis.drosophila littoralis is a latitudinally widespread european species of the drosophila virilis group. the species has ample genetic variation in photoperiodism (adult diapause) and circadian rhythmicity (pupal eclosion rhythm), with adaptive latitudinal clines in both of them. the possible common genetic basis between the variability of photoperiodism and circadian rhythms was studied by a long-term crossing experiment. a northern strain (65 degrees n) having long critical day length (cdl = 19.9 ...200616461980
nucleotide variation at the no-on-transient a gene in drosophila littoralis.the no-on-transient a (nona) gene encodes a putative rna-binding protein, and mutations in this gene are known to affect vision, male courtship song and viability in drosophila melanogaster. here we have sequenced the coding region of the nona gene of drosophila littoralis and compared it with those of drosophila virilis and d. melanogaster. all portions of nona appeared to be conserved between d. littoralis and d. virilis, while the 5' region of the gene of these two species showed high diverge ...200211813105
resolving the phylogenetic relationships and evolutionary history of the drosophila virilis group using multilocus data.the drosophila virilis group is one of the major lineages of drosophila previously recognised and it has been used as a model for different types of studies. it comprises 13 species whose phylogenetic relationships are not well resolved. in the present study, six nuclear genes (adh, fused, gpdh, nona, cg9631 and cg7219) and the mitochondrial ribosomal rna genes (12s-16s) have been used to estimate the evolutionary tree of the group using different methods of phylogenetic reconstruction. differen ...201121571080
two divergent species of the virilis group, drosophila littoralis and drosophila virilis, share a replacement polymorphism at the fused locus. 200211919301
another way of being anisogamous in drosophila subgenus species: giant sperm, one-to-one gamete ratio, and high zygote provisioning.it is generally assumed that sexes in animals have arisen from a productivity versus provisioning conflict; males are those individuals producing gametes necessarily small, in excess, and individually bereft of all paternity assurance. a 1- to 2-cm sperm, 5-10 times as long as the male body, might therefore appear an evolutionary paradox. as a matter of fact, species of drosophila of the drosophila subgenus differ from those of other subgenera by producing exclusively sperm of that sort. we repo ...19947937962
the effect of inbreeding rate on fitness, inbreeding depression and heterosis over a range of inbreeding coefficients.understanding the effects of inbreeding and genetic drift within populations and hybridization between genetically differentiated populations is important for many basic and applied questions in ecology and evolutionary biology. the magnitudes and even the directions of these effects can be influenced by various factors, especially by the current and historical population size (i.e. inbreeding rate). using drosophila littoralis as a model species, we studied the effect of inbreeding rate over a ...201425553071
inbreeding rate modifies the dynamics of genetic load in small populations.the negative fitness consequences of close inbreeding are widely recognized, but predicting the long-term effects of inbreeding and genetic drift due to limited population size is not straightforward. as the frequency and homozygosity of recessive deleterious alleles increase, selection can remove (purge) them from a population, reducing the genetic load. at the same time, small population size relaxes selection against mildly harmful mutations, which may lead to accumulation of genetic load. th ...201222957182
the benefits of interpopulation hybridization diminish with increasing divergence of small populations.interpopulation hybridization can increase the viability of small populations suffering from inbreeding and genetic drift, but it can also result in outbreeding depression. the outcome of hybridization can depend on various factors, including the level of genetic divergence between the populations, and the number of source populations. furthermore, the effects of hybridization can change between generations following the hybridization. we studied the effects of population divergence (low vs. hig ...201222947037
laboratory relationships between adult lifetime reproductive success and fitness surrogates in a drosophila littoralis population.the difficulties in measuring total fitness of individuals necessitate the use of fitness surrogates in ecological and evolutionary studies. these surrogates can be different components of fitness (e.g. survival or fecundity), or proxies more uncertainly related to fitness (e.g. body size or growth rate). ideally, fitness would be measured over the lifetime of individuals; however, more convenient short-time measures are often used. adult lifetime reproductive success (adult lrs) is closely rela ...201121931756
[dynamics of mitochondrial polymorphism in a natural population of drosophila littoralis].during seven years, we observed stable mtdna polymorphism in a local population of drosophila littoralis. using rflp, a number of mitochondrial haplotypes were revealed, two of which were the core and in condition of stable equilibrium. to explain the absence of fixation of one haplotype, we checked a hypothesis that the d. littoralis population had a complex structure, being subdivided into several partially isolated races existing on the same territory. analysis of highly hypervariable nuclear ...200818619037
criteria of female mate choice in drosophila littoralis, d. montana, and d. ezoana.we examined sexual selection by drosophila littoralis, d. montana, and d. ezoana females on male courtship sounds to determine whether the females use absolute or relative criteria when choosing their mates. behavior of the females was observed, when they were courted by a single male producing normal sounds, or by a single wing-manipulated male producing abnormal sounds; and when they were courted by one or both of these males in a choice situation. the females usually accepted short-winged (bu ...199328567887
inheritance of male courtship sound characteristics in drosophila littoralis.males of drosophila littoralis vibrate their wings during courtship to deliver a "love song." this consists of 25- to 50-ms-long pulses with a basic frequency of about 250-400 hz, separated by 250- to 500-ms pauses. when recording the sounds of flies from several localities in europe, we found that males of one strain from northern finland displayed courtship sounds with an unusually low wing beat frequency (below 250 hz). in a genetic analysis utilizing marker stocks, the anomalous frequency wa ...19902378614
comments to jerry a. coyne: do males of drosophila littoralis have free recombination? 19883079527
genetic correlation between circadian eclosion rhythm and photoperiodic diapause in drosophila littoralis.populations of drosophila littoralis are known to be latitudinally highly variable in photoperiodic adult diapause and pupal eclosion rhythm. phenotypic correlations between the two time-measuring systems among the strains from different latitudes are, however, weak. in the present study, two differing strains were crossed reciprocally in order to search for causal (genetic) correlations between the two traits in the strains. segregation in the f2 generations showed that variation in each trait ...19862979577
close to equal crossing-over frequencies in males and females in drosophila littoralis. 19816765635
genetics of the photoperiodic diapause in drosophila littoralis. 19751165205
the environmental regulation of adult diapause in drosophila littoralis. 19744419755
the influence of daylength and temperature on the testis pterin content of drosophila littoralis. 19725075914
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