| natural selection and the reinforcement of mate recognition. | natural selection on mate recognition may often contribute to speciation, resulting in reproductive character displacement. field populations of drosophila serrata display reproductive character displacement in cuticular hydrocarbons when sympatric with drosophila birchii. we exposed field sympatric and allopatric populations of d. serrata to experimental sympatry with d. birchii for nine generations. cuticular hydrocarbons of field allopatric d. serrata populations evolved to resemble the field ... | 2000 | 11039933 |
| low potential for climatic stress adaptation in a rainforest drosophila species. | the ability of sensitive rainforest species to evolve in response to climate change is largely unknown. we show that the australian tropical rainforest fly drosophila birchii exhibits clinal variation in desiccation resistance, but the most resistant population lacks the ability to evolve further resistance even after intense selection for over 30 generations. parent-offspring comparisons indicate low heritable variation for this trait but high levels of genetic variation for morphology. d. birc ... | 2003 | 12843394 |
| very low additive genetic variance and evolutionary potential in multiple populations of two rainforest drosophila species. | most quantitative traits are thought to exhibit high levels of genetic variance and evolutionary potential. however, this conclusion may be biased by a lack of studies on nonmodel organisms and may not generalize to restricted species. a recent study on a single, southern population of the rainforest-restricted drosophila birchii failed to find significant additive genetic variance for the desiccation resistance trait; however, it is unclear whether this pattern extends to other d. birchii popul ... | 2006 | 16817549 |
| lack of genetic structure among ecologically adapted populations of an australian rainforest drosophila species as indicated by microsatellite markers and mitochondrial dna sequences. | although fragmented rainforest environments represent hotspots for invertebrate biodiversity, few genetic studies have been conducted on rainforest invertebrates. thus, it is not known if invertebrate species in rainforests are highly genetically fragmented, with the potential for populations to show divergent selection responses, or if there are low levels of gene flow sufficient to maintain genetic homogeneity among fragmented populations. here we use microsatellite markers and dna sequences f ... | 2007 | 17402983 |
| testing evolutionary hypotheses about species borders: patterns of genetic variation towards the southern borders of two rainforest drosophila and a related habitat generalist. | several evolutionary hypotheses help explain why only some species adapt readily to new conditions and expand distributions beyond borders, but there is limited evidence testing these hypotheses. in this study, we consider patterns of neutral (microsatellite) and quantitative genetic variation in traits in three species of drosophila from the montium species group in eastern australia. we found little support for restricted or asymmetrical gene flow in any species. in rainforest-restricted droso ... | 2009 | 19324823 |
| testing for local adaptation and evolutionary potential along altitudinal gradients in rainforest drosophila: beyond laboratory estimates. | predicting how species will respond to the rapid climatic changes predicted this century is an urgent task. species distribution models (sdms) use the current relationship between environmental variation and species' abundances to predict the effect of future environmental change on their distributions. however, two common assumptions of sdms are likely to be violated in many cases: (i) that the relationship of environment with abundance or fitness is constant throughout a species' range and wil ... | 2017 | 28070978 |
| temperature fluctuations during development reduce male fitness and may limit adaptive potential in tropical rainforest drosophila. | understanding the potential for organisms to tolerate thermal stress through physiological or evolutionary responses is crucial given rapid climate change. although climate models predict increases in both temperature mean and variance, such tolerances are typically assessed under constant conditions. we tested the effects of temperature variability during development on male fitness in the rainforest fly drosophila birchii, by simulating thermal variation typical of the warm and cool margins of ... | 2017 | 29282784 |
| demographic factors and genetic variation influence population persistence under environmental change. | population persistence has been studied in a conservation context to predict the fate of small or declining populations. persistence models have explored effects on extinction of random demographic and environmental fluctuations, but in the face of directional environmental change they should also integrate factors affecting whether a population can adapt. here, we examine the population-size dependence of demographic and genetic factors and their likely contributions to extinction time under sc ... | 2009 | 19120814 |
| levels of mate recognition within and between two drosophila species and their hybrids. | if sexual selection is to result in speciation, traits involved in mate choice within species need to be capable of producing sexual isolation between species. we investigated the association between mate choice and sexual isolation using interspecific hybrids between two sibling species, drosophila serrata and drosophila birchii. a perfuming experiment demonstrated that olfaction was involved in the sexual isolation between the two species. a quantitative genetic analysis using 30 populations o ... | 1998 | 18811430 |
| evolution of a mate recognition system after hybridization between two drosophila species. | i investigated the genetic relationship between male and female components of the mate recognition system and how this relationship influenced the subsequent evolution of the two traits, in a series of replicate populations of interspecific hybrids. thirty populations of hybrids between drosophila serrata and drosophila birchii were established and maintained for 24 generations. at the fifth generation after hybridization, the mating success of hybrid individuals with the d. serrata parent was d ... | 1998 | 18811375 |
| comparing complex fitness surfaces: among-population variation in mutual sexual selection in drosophila serrata. | despite a dramatic increase in empirical estimates of phenotypic selection over the past two decades, we remain remarkably ignorant about variation in the multivariate fitness surfaces that shape the adaptive landscape. we develop a novel approach for quantifying patterns of spatial and/or temporal variation in multivariate selection that directly compares vectors of linear selection gradients (beta) and matrices of nonlinear selection gradients (gamma) that describe the multivariate fitness sur ... | 2008 | 18254685 |
| are traits that experience reinforcement also under sexual selection? | where closely related species occur in sympatry, reinforcement may result in the evolution of traits involved in species recognition that are at the same time used for within-species mate choice. drosophila serrata lives in forested habitat on the east coast of australia, and over the northern half of its distribution it coexists with a closely related species, drosophila birchii. here we show that the strength of reinforcing selection in natural populations is sufficient to generate reproductiv ... | 2007 | 17879191 |
| clinal variation and laboratory adaptation in the rainforest species drosophila birchii for stress resistance, wing size, wing shape and development time. | clinal variation has been described in many invertebrates including drosophilids but usually over broad geographical gradients. here we describe clinal variation in the rainforest species drosophila birchii from queensland, australia, and potential confounding effects of laboratory adaptation. clinal variation was detected for starvation and development time, but not for size or resistance to temperature extremes. starvation resistance was higher at southern locations. wing shape components were ... | 2005 | 15669978 |
| cuticular hydrocarbons of drosophila birchii and d. serrata: identification and role in mate choice in d. serrata. | the cuticular hydrocarbon compositions of two sympatric species of australian drosophila in the montium subgroup of the melanogaster group that use cuticular hydrocarbons in mate recognition have been characterized. drosophila birchii has 34 components in greater than trace amounts, with a carbon number range of c20 to c33. drosophila serrata has 21 components above trace level and a carbon number range of c24 to c31. these two species share eight hydrocarbon components, with all but two of them ... | 2003 | 12775155 |
| genetic constraints on the evolution of mate recognition under natural selection. | field populations of drosophila serrata display reproductive character displacement in cuticular hydrocarbons (chcs) when sympatric with drosophila birchii. we have previously shown that the naturally occurring pattern of reproductive character displacement can be experimentally replicated by exposing field allopatric populations of d. serrata to experimental sympatry with d. birchii. here, we tested whether the repeated evolution of reproductive character displacement in natural and experimenta ... | 2003 | 12675370 |
| evolution of the genetic covariance between male and female components of mate recognition: an experimental test. | the evolution of a positive genetic correlation between male and female components of mate recognition systems will result as a consequence of assortative mating and, in particular, is central to a number of theories of sexual selection. although the existence of such genetic correlations has been investigated in a number of taxa, it has yet to be shown that such correlations evolve and whether they may evolve as rapidly as suggested by sexual selection models. in this study, i used a hybridizat ... | 1999 | 10681248 |
| does interspecific hybridization influence evolutionary rates? an experimental study of laboratory adaptation in hybrids between drosophila serrata and drosophila birchii. | the low initial fitness of progeny from interspecific crosses in animals and the rarity of interspecific hybridization in natural environments have led to a debate about the evolutionary importance of this phenomenon. here we directly assess the effects of hybridization between drosophila serrata and drosophila birchii on evolutionary rates. we looked at the effects on laboratory adaptation over 30 generations in two laboratory environments, one of which involved nutrition and temperature stress ... | 1999 | 10649634 |
| additional evidence on sexual isolation within drosophila birchii. | | 1970 | 28563011 |
| chromosomal polymorphism in drosophila birchii. | | 2010 | 5480933 |
| karyotype variation in drosophila birchii. | | 1969 | 5345639 |
| evolution of fitness. i. improvement in the productivity and size of irradiated populations of drosophila serrata and drosophila birchii. | | 1966 | 5929243 |
| relative fitness of populations of drosophila serrata and drosophila birchii. | | 1965 | 14330692 |