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Transposable elements as agents of rapid adaptation may explain the genetic paradox of invasive species
It is hypothesized that activity of transposable elements can explain rapid adaptation despite low genetic variation (the genetic paradox of invasive species), and a framework under which this hypothesis can be tested using recently developed and emerging genomic technologies is provided.
The reaction norm of size and age at maturity under multiple predator risk.
- A. Beckerman, Gwendolen M. Rodgers, S. Dennis
- Biology, MedicineThe Journal of animal ecology
- 1 September 2010
This work uses experiments and probabilistic models of maturation reaction norms to investigate predator induced life history in the water flea Daphnia pulex facing two different predators, and combines this reaction norm investigation with an assessment of growth rate, development rate, moult number and moult duration to uncover the mechanisms controlling predatorinduced life history plasticity.
Transitions between phases of genomic differentiation during stick-insect speciation
- R. Riesch, Moritz Muschick, +16 authors P. Nosil
- Biology, MedicineNature Ecology &Evolution
- 17 February 2017
Intermediate phases of speciation are associated with genome-wide differentiation and mate choice, but not growth of a few genomic islands, and a gap in genomic differentiation between sympatric taxa that still exchange genes and those that do not is found.
Comparative Genomics Reveals Accelerated Evolution in Conserved Pathways during the Diversification of Anole Lizards
- M. Tollis, Elizabeth D. Hutchins, +22 authors K. Kusumi
- Biology, MedicineGenome biology and evolution
- 19 January 2018
Signs of positive selection across several genes related to the development and regulation of the forebrain, hormones, and the iguanian lizard dewlap are detected, suggesting molecular changes underlying behavioral adaptations known to reinforce species boundaries were a key component in the diversification of anole lizards.
A shared mechanism of defense against predators and parasites: chitin regulation and its implications for life-history theory
- A. Beckerman, Job de Roij, S. Dennis, T. Little
- Biology, MedicineEcology and evolution
- 20 November 2013
It is proposed that arthropod responses to predators and parasites will commonly be based on the endocrine regulation of chitin synthesis and degradation, and how this form of molecular regulation can be incorporated into theory on life-history trade-offs, specifically the Y-model.
Endocrine regulation of predator-induced phenotypic plasticity
This research synthesizes detail about predator-induced defenses and the physiological regulation of arthropod somatic growth and morphology, leading to a clear prediction that morphological defences are regulated by juvenile hormone and life-history plasticity by ecdysone and juvenile hormone.
Long-term balancing selection on chromosomal variants associated with crypsis in a stick insect.
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.
Color phenotypes are under similar genetic control in two distantly related species of Timema stick insect
- A. Comeault, C. F. Carvalho, S. Dennis, V. Soria-Carrasco, P. Nosil
- Biology, MedicineEvolution; international journal of organic…
- 1 June 2016
It is shown that similar color phenotypes of the two species cluster in phenotypic space, and genome‐wide association mapping is used to show that in both species, color is controlled by few loci, dominance relationships between color alleles are the same, and SNPs associated with color phenotype colocalize to the same linkage group.
Phenotypic convergence along a gradient of predation risk
- S. Dennis, M. Carter, W. Hentley, A. Beckerman
- Biology, MedicineProceedings of the Royal Society B: Biological…
- 7 June 2011
It is demonstrated, at the whole-organism level, that the two populations occupy different areas of phenotypic space in the absence of predation but converge in phenotyping space as predation threat increases.
Daphnia galeata responds to the exposure to an ichthyosporean gut parasite by down-regulation of immunity and lipid metabolism
The study provides the first description of host transcriptional responses in this very promising host-parasite experimental system, and finds a down-regulation of metabolism and immunity-related genes, which implies host energy shift from reproduction to survival, which is in agreement with the known drastic reduction in Daphnia fecundity after Caullerya infection.