Color phenotypes are under similar genetic control in two distantly related species of Timema stick insect

@article{Comeault2016ColorPA,
  title={Color phenotypes are under similar genetic control in two distantly related species of Timema stick insect},
  author={Aaron A. Comeault and Clarissa F. de Carvalho and Stuart R. Dennis and V{\'i}ctor Soria-Carrasco and Patrik Nosil},
  journal={Evolution},
  year={2016},
  volume={70}
}
Ecology and genetics are both of general interest to evolutionary biologists as they can influence the phenotypic and genetic response to selection. The stick insects Timema podura and Timema cristinae exhibit a green/melanistic body color polymorphism that is subject to different ecologically based selective regimes in the two species. Here, we describe aspects of the genetics of this color polymorphism in T. podura, and compare this to previous results in T. cristinae. We first show that… 
Large-scale mutation in the evolution of a gene complex for cryptic coloration
TLDR
It is shown that multiple linked but recombining loci underlie cryptic color morphs of Timema chumash stick insects, and how suppressed recombination and large-scale mutation can help to package gene complexes into discrete units of diversity such as morphs, ecotypes, or species are shown.
Long-term balancing selection on chromosomal variants associated with crypsis in a stick insect.
TLDR
The genetic architecture and maintenance of phenotypic morphs that confer crypsis in Timema cristinae stick insects are studied, combining phenotypesic information and genotyping-by-sequencing data from 1,360 samples across 21 populations.
The genetics and evolution of iridescent structural colour in Heliconius butterflies
TLDR
An understanding of the evolution of structural colour in Heliconius, in terms of its genetic control and its function as a signal and mimetic warning pattern is provided.
Phenotypic variation in Heliconius erato crosses shows that iridescent structural colour is sex-linked and controlled by multiple genes
TLDR
Using measurements of blue colour from photographs, it is found that iridescent structural colour is a quantitative trait controlled by multiple genes, with strong evidence for loci on the Z sex chromosome in H. erato crosses.
Spatial analyses of two color polymorphisms in an alpine grasshopper reveal a role of small‐scale heterogeneity
TLDR
The data suggest that small‐scale migration–selection balance and/or local balancing selection maintain populations polymorphic, and the almost universal co‐occurrence of all three color morphs argues against strong effects of genetic drift.
Ecology shapes epistasis in a genotype-phenotype-fitness map for stick insect colour.
TLDR
It is shown that epistasis for fitness is an emergent and predictable property of nonlinear selective processes, and patterns of epistasis that are shaped by ecologically based selection could be common and central to understanding fitness landscapes, the dynamics of evolution and potentially other complex systems.
The green-brown polymorphism of the club-legged grasshopper Gomphocerus sibiricus is heritable and appears genetically simple
TLDR
Overall, the data demonstrate that the two polymorphisms are heritable in the club-legged grasshopper and appear genetically simple, at least with respect to green morphs, and are consistent with the idea that the synthesis or transport of a pigment involved in the production of green coloration is lost by homozygosity for loss-of-function alleles in brown individuals.
Novel Candidate Genes Underlying Extreme Trophic Specialization in Caribbean Pupfishes
TLDR
The genetic basis of craniofacial traits enabling novel trophic specialization in a sympatric radiation of Cyprinodon pupfishes endemic to San Salvador Island, Bahamas is examined, suggesting that the effect sizes of regions influencing jaw phenotypes are positively correlated with distance between fitness peaks on a complex adaptive landscape.
Evolutionary genetics of host shifts in herbivorous insects: insights from the age of genomics
TLDR
It is argued that investigation of diverse host‐use traits and identification of causal genes and mutations should be the top priorities for future studies on the evolutionary genetics of host shifts, indicating that any conclusions about the causes and consequences of host‐ use evolution will depend heavily on which host‐used traits are investigated.
Genomic associations with bill length and disease reveal drift and selection across island bird populations
TLDR
The role of selection and drift in shaping genomic and phenotypic variation across recently separated populations of Berthelot's pipit, a passerine bird endemic to three archipelagos in the Atlantic, is examined.
...
1
2
3
...

References

SHOWING 1-10 OF 56 REFERENCES
Selection on a Genetic Polymorphism Counteracts Ecological Speciation in a Stick Insect
Genome-Wide Association Mapping of Phenotypic Traits Subject to a Range of Intensities of Natural Selection in Timema cristinae*
TLDR
No relationship between variation in levels of divergence among traits in nature and variation in parameters describing the genetic architecture of those same traits is found, and a modest number of SNPs that were associated with traits and sometimes explained a large proportion of trait variation are identified.
Stick Insect Genomes Reveal Natural Selection’s Role in Parallel Speciation
Stick to the Bush Can the underlying genetic changes driving the divergence of populations into new species be predicted or repeated? Soria-Carrasco et al. (p. 738) investigated the genetic changes
Genomic consequences of multiple speciation processes in a stick insect
TLDR
Patterns consistent with effects of numerous factors are found, including geographical distance, gene flow, divergence in host plant use and climate, and selection against maladaptive hybridization in a system undergoing ecological speciation.
Molecular and functional basis of phenotypic convergence in white lizards at White Sands
TLDR
The results demonstrate that even when the same gene is responsible for phenotypic convergence, differences in molecular mechanism can have dramatic consequences on trait expression and ultimately the adaptive trajectory.
Genome‐wide association genetics of an adaptive trait in lodgepole pine
TLDR
A first genome‐wide association map of serotiny in pines is provided and an inexpensive and efficient method for generating population genomic data is utilizing to generate a library of fragments that can be sequenced with a high level of multiplexing is presented.
COUNTERACTING SELECTIVE REGIMES AND HOST PREFERENCE EVOLUTION IN ECOTYPES OF TWO SPECIES OF WALKING‐STICKS
  • C. Sandoval, P. Nosil
  • Biology, Medicine
    Evolution; international journal of organic evolution
  • 2005
TLDR
Host preference in both Timema walking‐stick insects has evolved before divergent physiological adaptation but in concert with morphological adaptations, shedding light onto which traits are involved in the initial stages of ecological specialization and ecological based reproductive isolation.
The genomic landscape underlying phenotypic integrity in the face of gene flow in crows
TLDR
Characterization of genomic differentiation in a classic example of hybridization between all-black carrion crows and gray-coated hooded crows identified genome-wide introgression extending far beyond the morphological hybrid zone, indicating localized genomic selection can cause marked heterogeneity in introgressive landscapes while maintaining phenotypic divergence.
Phylogenetic evidence for the evolution of ecological specialization in Timema walking‐sticks
TLDR
This analysis showed that host‐plant use has evolved nonrandomly, such that more closely related species tend to use similar sets of hosts and colour pattern evolution exhibits considerable lability, and that information from biogeography, floristic history and the timing of diversification of the genus are compatible with patterns of inferred ancestral host‐ plant use.
Admixture and the organization of genetic diversity in a butterfly species complex revealed through common and rare genetic variants
Detailed information about the geographic distribution of genetic and genomic variation is necessary to better understand the organization and structure of biological diversity. In particular,
...
1
2
3
4
5
...