10.5061/DRYAD.16G74
Kennedy, Euan S.
Department of Conservation
Grueber, Catherine E.
University of Otago
Duncan, Richard P.
University of Canberra
Jamieson, Ian G.
University of Otago
Data from: Severe inbreeding depression and no evidence of purging in an
extremely inbred wild species - the Chatham Island black robin
Dryad
dataset
2013
Inbreeding
2013-11-06T18:15:43Z
2013-11-06T18:15:43Z
en
https://doi.org/10.1111/evo.12315
103804 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Although evidence of inbreeding depression in wild populations is well
established, the impact of genetic purging in the wild remains
controversial. The contrasting effects of inbreeding depression, fixation
of deleterious alleles by genetic drift and the purging of deleterious
alleles via natural selection mean that predicting fitness outcomes in
populations subjected to prolonged bottlenecks is not straightforward. We
report results from a long-term pedigree study of arguably the
world's most inbred wild species of bird: the Chatham Island black
robin Petroica traversi, in which conditions were ideal for purging to
occur. Contrary to expectations, black robins showed a strong, negative
relationship between inbreeding and juvenile survival, yielding lethal
equivalents (2B) of 6.85. We also determined that the negative
relationship between inbreeding and survival did not appear to be mediated
by levels of ancestral inbreeding and may be attributed in part to
un-purged lethal recessives. Although the black robin demographic history
provided ideal conditions for genetic purging, our results show no clear
evidence of purging in the major life-history trait of juvenile survival.
Our results also show no evidence of fixation of deleterious alleles in
juvenile survival, but do confirm that continued high levels of
contemporary inbreeding in a historically inbred population could lead to
additional severe inbreeding depression.
DatasheetAContains pairwise predictor variables, and fledging rate
response variable, for analyses presented in Table 1; Table 2; Figure 2;
Supplementary Figure 1; Supplementary Table 1; Supplementary Table 2;
Supplementary Table 3. For the code used to generate Fa and ll estimates
from the pedigree (DatasheetC), see Supplementary R code 1 and 2,
published with the manuscript. Under the "Site" variable:
"TPB" = Top Bush, "MGR" - Mangere, "WSB" =
Woolshed Bush.DatasheetBContains inbreeding (F) and census (N) data per
year, over three sites, used to generate Figure 1.DatasheetCContains
pedigree of animals included in this study, plus ll estimates for each
individual, used to generate Supplementary Figure 2. Missing data =
"NA".DatasheetDContains fledging data for all pairs from 1990
onwards, used to generate Supplementary Figure 3.