Data from: Severe inbreeding depression and no evidence of purging in an extremely inbred wild species - the Chatham Island black robin
Kennedy, Euan S., Department of Conservation
Grueber, Catherine E., University of Otago
Duncan, Richard P., University of Canberra
Jamieson, Ian G., University of Otago
Published Nov 06, 2013 on Dryad.
Cite this dataset
Kennedy, Euan S.; Grueber, Catherine E.; Duncan, Richard P.; Jamieson, Ian G. (2013). Data from: Severe inbreeding depression and no evidence of purging in an extremely inbred wild species - the Chatham Island black robin [Dataset]. Dryad. https://doi.org/10.5061/dryad.16g74
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.
Contains 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.
Contains inbreeding (F) and census (N) data per year, over three sites, used to generate Figure 1.
Contains pedigree of animals included in this study, plus ll estimates for each individual, used to generate Supplementary Figure 2. Missing data = "NA".
Contains fledging data for all pairs from 1990 onwards, used to generate Supplementary Figure 3.