---
res:
bibo_abstract:
- "Maladapted individuals can only colonise a new habitat if they can evolve a\r\npositive
growth rate fast enough to avoid extinction, a process known as evolutionary\r\nrescue.
We treat log fitness at low density in the new habitat as a\r\nsingle polygenic
trait and thus use the infinitesimal model to follow the evolution\r\nof the growth
rate; this assumes that the trait values of offspring of a\r\nsexual union are
normally distributed around the mean of the parents’ trait\r\nvalues, with variance
that depends only on the parents’ relatedness. The\r\nprobability that a single
migrant can establish depends on just two parameters:\r\nthe mean and genetic
variance of the trait in the source population.\r\nThe chance of success becomes
small if migrants come from a population\r\nwith mean growth rate in the new habitat
more than a few standard deviations\r\nbelow zero; this chance depends roughly
equally on the probability\r\nthat the initial founder is unusually fit, and on
the subsequent increase in\r\ngrowth rate of its offspring as a result of selection.
The loss of genetic variation\r\nduring the founding event is substantial, but
highly variable. With\r\ncontinued migration at rate M, establishment is inevitable;
when migration\r\nis rare, the expected time to establishment decreases inversely
with M.\r\nHowever, above a threshold migration rate, the population may be trapped\r\nin
a ‘sink’ state, in which adaptation is held back by gene flow; above this\r\nthreshold,
the expected time to establishment increases exponentially with M. This threshold
behaviour is captured by a deterministic approximation,\r\nwhich assumes a Gaussian
distribution of the trait in the founder population\r\nwith mean and variance
evolving deterministically. By assuming a constant\r\ngenetic variance, we also
develop a diffusion approximation for the joint distribution\r\nof population
size and trait mean, which extends to include stabilising\r\nselection and density
regulation. Divergence of the population from its\r\nancestors causes partial
reproductive isolation, which we measure through\r\nthe reproductive value of
migrants into the newly established population.@eng"
bibo_authorlist:
- foaf_Person:
foaf_givenName: Nicholas H
foaf_name: Barton, Nicholas H
foaf_surname: Barton
foaf_workInfoHomepage: http://www.librecat.org/personId=4880FE40-F248-11E8-B48F-1D18A9856A87
orcid: 0000-0002-8548-5240
- foaf_Person:
foaf_givenName: Alison
foaf_name: Etheridge, Alison
foaf_surname: Etheridge
bibo_doi: 10.1016/j.tpb.2017.11.007
bibo_issue: '7'
bibo_volume: 122
dct_date: 2018^xs_gYear
dct_language: eng
dct_publisher: Academic Press@
dct_title: Establishment in a new habitat by polygenic adaptation@
...