Thus, we should expect that green herbivores, harbouring even slight amounts of heritable body-colour variation, to adapt via natural selection to the purple substrate, evolving purple body coloration to achieve better camouflage.
Given the small population sizes of fragmented populations and the low mutation rates, new mutations will rarely play an important role and populations have to rely on the standing genetic variation to adapt (Lynch and Lande 1993; Blows and Hoffmann 2005; Orr and Unckless 2008; Teotónio et al. 2009).
For instance, habitat alteration might be so drastic that the variation required to adapt is simply not available.
Interestingly in Oryza, it was observed that during the course of duplication the structural domains accumulate variations in order to adapt to new function.
A large amount of genetic variation that is present but invisible at the phenotypic level (i.e. cryptic variation) enables populations to adapt faster to environmental change (Le Rouzic and Carlborg 2008; Wagner 2011, 2012; Masel 2013).
In a world of clones, there would not be enough variation for populations to adapt.
His thoughts on lifespan, asexual reproduction and sexual reproduction developed in his "B" notebook around mid-July on to variation in offspring "to adapt & alter the race to changing world" explaining the Galápagos tortoises, mockingbirds and rheas.
Non-genetic variation enables cells to adapt to short-lived environmental changes without permanently accumulating potentially harmful mutations [31], [78].
High genetic variation enables species to adapt to changing environments (Zhao et al. 2012 b ).
As long as populations can maintain sufficiently high fecundity and levels of genetic variation, the capacity to adapt to a rapidly changing climate may be sufficient to maintain trees across the landscape, although these populations may suffer some adaptational lag for several generations.
