Month: September 2022

GENE FLOW AND TIME. "Both time and low gene flow are the key factors by which different biological species arise. The divergence process among lineages and the development of pre- or postzygotic isolation occur when gene flow events are lacking." https://lnkd.in/gBACF7A View in LinkedIn

GENE FLOW AND SPECIATION. "The role of gene flow during speciation and how it contributes to the emergence of islands of differentiation are key questions in speciation genomics." https://lnkd.in/gTNiFfV View in LinkedIn

GENE FLOW PROMOTES COHESION. "One of the most intriguing aspects of speciation is how it might proceed under the most difficult of circumstances, namely in the face of gene flow. Gene flow poses an especially interesting problem for evolutionary theorists because it counters the forces driving differentiation between species, leading to continued cohesion across them." https://lnkd.in/g9StYjV View in LinkedIn

GENE FLOW AND SPECIATION. "Speciation in the presence of gene flow, in sexual species, can be driven by two general processes: (i) nonrandom mating that results in assortative mating, the mating of like with like, which reduces gene flow between groups, and (ii) divergent selection, which favors extremes in a population and thus can lead to a splitting of the species." https://lnkd.in/g9StYjV View in LinkedIn

SEXUAL SELECTION. "The role of sexual selection in speciation with gene flow, however, is less clear; some studies suggest it can drive the speciation process, while others suggest it can inhibit it, under different conditions." https://lnkd.in/g9StYjV View in LinkedIn

CAUSES AND CONSEQUENCES. "Ecological selection as the cause and sexual differentiation as the consequence of species divergence?" https://lnkd.in/ggrcHvH View in LinkedIn

CHALLENGING. "When species differ in both ecological and sexual characters, it is notoriously difficult to distinguish between character divergence that is a cause or a result of species divergence." https://lnkd.in/ggrcHvH View in LinkedIn

SPECIATION QUESTIONS. "Models of adaptive speciation are typically concerned with demonstrating that it is possible for ecologically driven disruptive selection to lead to the evolution of assortative mating and hence speciation. However, disruptive selection could also lead to other forms of evolutionary diversification, including ecological sexual dimorphisms."" "DOI: 10.1111/j.0014-3820.2003.tb01489.x View in LinkedIn

FRAGMENT FROM NATURE offers an historical snapshot of the rat flea derived bacterial bubonic plague that halved the European, Asian and African population in the mid-fourteenth century. It still exists today, and can be treated with antibiotics, with a 1-15% mortality rate. The Black Death had very profound social and cultural impacts on European society. It also partially protected the surviving population against later outbreaks. View in LinkedIn

SONG OF DARWIN. "The more I study nature, the more I become impressed […] that the contrivances and beautiful adaptations [acquired through natural selection] transcend in an incomparable degree [those] which the most fertile imagination of the most imaginative man could suggest with unlimited time at his disposal." https://lnkd.in/eykUy37 View in LinkedIn