Quote by Rui Diogo

“As also noted by Morris, empirical data from various lineages of fish and amphibians have shown, for instance, that more plastic clades tend to be more speciose than sister taxa of similar age but with less plasticity, due to a combination of greater opportunities to diversify and augmented evolvability of plastic features and thus of decreased risk of extinction. In addition, empirical studies show that even populations that derive from ancestors that were particularly overspecialized for a certain, very specific way of life, including parasitism, have successfully changed their behavior by becoming non-parasitic and displaying a morphology that is substantially different from that of their ancestors as seen for example in lamprey evolution. Morris argued that random variations arising in a population may decrease plasticity and that the plastically changed phenotype linked with the behavioral shift may be negatively affected. Therefore, these variants will be likely eliminated by selection, whereas variants that decrease plasticity in the direction of the plastic change will tend to be selected and spread through the population. This may lead to a situation in which the phenotype might appear similar across generations, but its plasticity is actually increasingly reduced until an environmental shift will no longer provoke phenotypic changes. As noted by Morris, Baldwin allowed for other non-mutually exclusive scenarios to occur, such as the rise of variants that increase plasticity in general, thus increasing the ‘fit’ between organisms and their environment and the degree to which evolution could be directed, thus leading to evolutionary trends.”

Quote by Rui Diogo