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DENSITY‐DEPENDENT NATURAL SELECTION IN DROSOPHILA: EVOLUTION OF GROWTH RATE AND BODY SIZE
- Mauro Santos, D. J. Borash, A. Joshi, Nira Bounlutay, L. Mueller
- Biology, MedicineEvolution; international journal of organic…
- 1 April 1997
The results have important implications for understanding the evolution of body size in natural populations of Drosophila, and stand against some widespread beliefs that body size may represent a compromise between the conflicting effects of genetic variation in larval and adult performance.
Trade-offs and the evolution of host specialization
If performance is polygenically controlled and some performance loci possess only antagonistically pleiotropic alleles, then the expression of trade-offs in performance will vary over time in populations, and studies testing performance on a novel as compared with a normal host will generally yield non-negative genetic correlations between performance on the two hosts.
What have two decades of laboratory life-history evolution studies onDrosophila melanogaster taught us?
Work on the ecology and evolution of life-histories in laboratory populations of D. melanogaster is reviewed, emphasizing how environmental effects on life-history-related traits can influence evolutionary change.
Stability via Asynchrony in Drosophila Metapopulations with Low Migration Rates
Simulations based on a simple non–species-specific population growth model captured most features of the data, which suggests that the results are generalizable.
Persistence of oviposition rhythm in individuals of Drosophila melanogaster reared in an aperiodic environment for several hundred generations.
- V. Sheeba, M. Chandrashekaran, A. Joshi, V. K. Sharma
- Biology, MedicineThe Journal of experimental zoology
- 15 September 2001
The results indicate that the phenomenon of egg laying is rhythmic in individual D. melanogaster females and is controlled by an endogenous time keeping mechanism, which strengthens the view that possessing biological clocks may confer some intrinsic fitness advantage even to organisms living in aperiodic environments.
DIRECTIONAL AND STABILIZING DENSITY‐DEPENDENT NATURAL SELECTION FOR PUPATION HEIGHT IN DROSOPHILA MELANOGASTER
Six populations of Drosophila melanogaster have been kept at extreme population densities, three high and three low, for 175 generations, and there is no indication that the evolution of this trait, in response to density, has altered its phenotypic plasticity.
Variation in adult life history and stress resistance across five species ofDrosophila
- N. Bharathi, N. G. Prasad, M. Shakarad, A. Joshi
- Biology, MedicineJournal of Genetics
- 1 December 2003
The laboratory population of Drosophila melanogaster was clearly superior, under laboratory conditions, to the other four species if adult lifespan, lifetime fecundity, average daily fecundities, and absolute starvation and desiccation resistance are considered.
Density-dependent natural selection inDrosophila: Trade-offs between larval food acquisition and utilization
The generality of such a density-dependent trade-off between food acquisition and utilization is confirmed by demonstrating its occurrence in a new set of Drosophila populations subjected to extreme larval crowding.
Oviposition preference for novel versus normal food resources in laboratory populations ofDrosophila melanogaster
Comparison of results from fecundity and oviposition preference assays showed that the egg laying behaviour of Drosophila females in response to different food media may be different in choice versus no-choice situations, and may not be preferred over the other substrate when a choice between the two is provided to the ovipositing females.
K-selection, α-selection, effectiveness, and tolerance in competition: Density-dependent selection revisited
This work shows that incorporating notions of α-selection, and the division of competitive ability into effectiveness and tolerance components, into the concept of density-dependent selection yields a formulation that allows for a better understanding of the empirical results, and predicts that selection for faster development in Drosophila should lead to the correlated evolution of decreased competitive ability.