| on crossing between drosophila bipectinata and drosophila malerkotliana. | | 2015 | 4764762 |
| insights into differential activity patterns of drosophilids under semi-natural conditions. | we showed recently that drosophila ananassae, a closely related and sympatric species of the commonly studied fruitfly d. melanogaster, shows distinctly deviant patterns in circadian activity/rest rhythm from the latter under a variety of laboratory conditions. to examine whether such differences extend to more natural conditions where a variety of time cues and similar environmental pressures might force different species to adopt similar temporal patterns, we examined these two species under s ... | 2013 | 24143027 |
| is genome size influenced by colonization of new environments in dipteran species? | genome size differences are usually attributed to the amplification and deletion of various repeated dna sequences, including transposable elements (tes). because environmental changes may promote modifications in the amount of these repeated sequences, it has been postulated that when a species colonizes new environments this could be followed by an increase in its genome size. we tested this hypothesis by estimating the genome size of geographically distinct populations of drosophila ananassae ... | 2005 | 15723678 |
| yeast succession in the amazon fruit parahancornia amapa as resource partitioning among drosophila spp. | the succession of yeasts colonizing the fallen ripe amapa fruit, from parahancornia amapa, was examined. the occupation of the substrate depended on both the competitive interactions of yeast species, such as the production of killer toxins, and the selective dispersion by the drosophilid guild of the amapa fruit. the yeast community associated with this amazon fruit differed from those isolated from other fruits in the same forest. the physiological profile of these yeasts was mostly restricted ... | 1995 | 8534092 |
| temperature sensitivity of circadian clocks is conserved across drosophila species melanogaster, malerkotliana and ananassae. | light and temperature are the major environmental cycles that can synchronize circadian rhythms in a variety of organisms. previously, we have shown that under light/dark cycles of various photoperiods, the drosophila species ananassae exhibits unimodal activity pattern with a prominent morning activity peak in contrast with drosophila melanogaster and drosophila malerkotliana, which show bimodal activity pattern with morning and evening activity peaks. here we report that circadian clocks contr ... | 2014 | 25051431 |
| no character displacement for reproductive isolation between drosophila bipectinata and drosophila malerkotliana. | to test whether character displacement for reproductive isolation between drosophila bipectinata and drosophila malerkotliana exists, the degree of sexual isolation was measured between their sympatric and allopatric populations. although the isolation indices vary in different crosses, the average isolation index for sympatric populations is very close to that for allopatric populations. this shows no difference in the degree of sexual isolation between sympatric and allopatric populations of d ... | 1991 | 1778468 |
| body size, mating success and advantage of large flies in drosophila bipectinata species complex. | mating success of large and small flies of drosophila malerkotliana and d. bipectinata was studied using multiple, male and female choice methods. in multiple choice method the large male mated with large female and small male paired with small female. in female choice method, large male was successful in mating with female irrespective of its size while in male choice method, preferential mating occurred between large male and large female as well as small male and small female. the consequence ... | 1997 | 9567772 |
| chromosomal phylogeny and geographical divergence in the drosophila bipectinata complex. | we have prepared reference polytene photographic maps as a standard sequence for the drosophila bipectinata complex using structurally homozygous flies derived from a stock of drosophila parabipectinata from brunei, borneo, in 1971. we found 87 inversions in the d. bipectinata complex and described their breakpoints on the reference maps. only 2 arrangements were shared interspecifically: 2r-ab was shared with 3 species, d. parabipectinata, d. bipectinata, and drosophila malerkotliana, and 3l-a ... | 2005 | 16121245 |
| interspecific sexual isolation and phylogeny among different members of the drosophila bipectinata species complex. | the degree and pattern of sexual isolation among closely related species can be utilized for predicting the direction of evolution and deriving a phylogeny. the drosophila bipectinata species complex is a group of four morphologically very similar species, belonging to the ananassae subgroup of the melanogaster species group. sexual isolation among the members of this complex was studied by employing the male-choice technique. to test the difference between the homogamic and heterogamic matings, ... | 2012 | 22638827 |
| divergent strategies for adaptations to stress resistance in two tropical drosophila species: effects of developmental acclimation in d. bipectinata and the invasive species d. malerkotliana. | previous studies on two tropical drosophila species (d. malerkotliana and d. bipectinata) have shown lower resistance to stress-related traits but the rapid colonization of d. malerkotliana in the past few decades is not consistent with its sensitivity to desiccation and cold stress. we tested the hypothesis that developmental acclimation at two growth temperatures (17 and 25°c) can confer adaptations to desiccation and thermal stresses. we found divergence in developmental plastic effects on cu ... | 2014 | 24265421 |
| sperm displacement in the drosophila bipectinata species complex: evidence for interspecific variations. | we studied sperm displacement in two members of the drosophila bipectinata species complex i.e., drosophila parabipectinata and drosophila malerkotliana by employing mutant and wild type strains. we found a significant increase in the productivity of remated females than that of once mated ones in all the crosses of the two species. the p2' values range from 0.67 to 0.70 in d. malerkotliana and 0.52 to 0.56 in d. parabipectinata. these results were compared with that of our earlier finding in d. ... | 2015 | 25556898 |
| correlative studies on mating speed and metric traits in drosophila malerkotliana. | relationship between mating speed, an important component of fitness, and morphological characters such as lengths of wing, femur, tibia and first tarsus have been analysed in d. malerkotliana. flies mating first have longer wings and forelegs and mating flies have lower coefficient of variability in wing length than nonmating ones. age seems to have no detectable effect on the relationship between these metric traits and mating speed. | 1992 | 1459603 |
| effect of bottlenecks on incipient sexual isolation, mating activity and fertility in drosophila malerkotliana. | effect of bottleneck sizes, on sexual isolation, mating speed and fertility were studied in d. malerkotliana established from natural population. after 10 generations of laboratory breeding, flies showed incipient sexual isolation between control line and some bottleneck lines and also between bottleneck lines. these findings do not fully agree with the general assumption that the establishment of bottlenecks accelerates speciation. the courtship latency and mating speed increases with increasin ... | 1996 | 9063077 |
| size-assortative mating in drosophila malerkotliana | the relationships between wing size, locomotor activity, mating latency, courtship pattern and mating success (total number of pairs mated in a given time unit) were studied in pairs of drosophila malerkotlianamating latency was negatively correlated with wing length and with locomotor activity while wing length and locomotor activity were positively related. in trios of a female and a long-winged and a short-winged male, long-winged males mated more successfully than short-winged males. in trio ... | 1997 | 9268474 |
| bottleneck effect on intra- and interspecific competition in drosophila malerkotliana. | intra and interspecific competition experiments involving control and bottleneck lines of monomorphic and polymorphic populations of d.malerkotliana with d.nasuta nasuta have been carried out. productivity and population size were evaluated in these lines. the results show that control line had higher relative fitness and adaptedness (productivity and population size) under both intra and interspecific competition than their respective bottleneck lines and d.nasuta nasuta. this indicates that bo ... | 1999 | 10641172 |
| epigenetics of dominance for enzyme activity. | we have isolated and purified two parental homodimers and a unique heterodimer of acid phosphatase [coded by acph-1 (1.05)(f) and acph-1 (0.95)(s)] from isogenic homozygotes and heterozygotes of drosophila malerkotliana. f and s produce qualitatively different allozymes and the two alleles are expressed equally within and across all three genotypes and f and s play an equal role in the epigenetics of dominance. subunit interaction in the heterodimer over a wide range of h+ concentrations account ... | 2002 | 11937683 |
| genetic basis of sex-specific color pattern variation in drosophila malerkotliana. | pigmentation is a rapidly evolving trait that can play important roles in mimicry, sexual selection, thermoregulation, and other adaptive processes in many groups of animals. in drosophila, pigmentation can differ dramatically among closely related taxa, presenting a good opportunity to dissect the genetic changes underlying species divergence. in this report, we investigate the genetic basis of color pattern variation between two allopatric subspecies of drosophila malerkotliana, a widespread m ... | 2008 | 18723880 |
| paradoxical masking effects of bright photophase and high temperature in drosophila malerkotliana. | synergic contribution of light and temperature is known to cause a paradoxical masking effect (inhibition of activity by bright light and high temperature) on various rhythms of animals. the present study reports the paradoxical masking effects of 1000-lux photophase at 25°c on the locomotor activity rhythm of drosophila malerkotliana. flies were subjected to light (l)-dark (d) 12:12 cycles wherein the photophase was varied from 10 to 1000 lux, whereas the scotophase was set to 0 lux in these an ... | 2012 | 22324554 |
| intraspecific sexual isolation in drosophila. | intraspecific sexual isolation was examined among wild strains of drosophila malerkotliana, d. parabipectinata and d. pseudoananassae by multiple-choice method in elens-wattiaux mating chamber. in d. pseudoananassae, mating between two strains tested was random and isolation estimate was close to one. in one out of 6 crosses, involving geographic strains of d. malerkotliana, there was significant deviation from randomness and isolation estimate remained low which shows non-random (preferential o ... | 1992 | 1459591 |
| subunit interaction: a molecular basis of heterosis. | acid phosphatase, a dimeric enzyme, in drosophila malerkotliana was studied in isogenic flies to explore the molecular basis of heterosis. as the enzyme activity in heterozygotes is 34% more than that in the better parent (s/s), heterosis is indicated. vmax, km, and ki values are 14.60, 3.6 x 10(-4) m, and 0.45 x 10(-4) m, respectively, for the enzyme from f/s flies and 11.80, 4.0 x 10(-4) m, and 0.37 x 10(-4) m, respectively, for the enzyme from s/s flies. thus heterosis for enzyme activity res ... | 1987 | 3450274 |
| biochemical characterization of allelic acid phosphatases in drosophila malerkotliana. | | 1980 | 7399582 |