ANALYSIS OF INBREEDING DEPRESSION IN MIXED-MATING PLANTS PROVIDES EVIDENCE FOR SELECTIVE INTERFERENCE AND STABLE MIXED MATING
Article first published online: 5 OCT 2011
© 2011 The Author(s). Evolution© 2011 The Society for the Study of Evolution.
Volume 65, Issue 12, pages 3339–3359, December 2011
How to Cite
Winn, A. A., Elle, E., Kalisz, S., Cheptou, P.-O., Eckert, C. G., Goodwillie, C., Johnston, M. O., Moeller, D. A., Ree, R. H., Sargent, R. D. and Vallejo-Marín, M. (2011), ANALYSIS OF INBREEDING DEPRESSION IN MIXED-MATING PLANTS PROVIDES EVIDENCE FOR SELECTIVE INTERFERENCE AND STABLE MIXED MATING. Evolution, 65: 3339–3359. doi: 10.1111/j.1558-5646.2011.01462.x
- Issue published online: 1 DEC 2011
- Article first published online: 5 OCT 2011
- Accepted manuscript online: 14 SEP 2011 07:58PM EST
- Received May 4, 2010 Accepted August 11, 2011 Data Archived: Dryad doi:10.5061/dryad.gr43t
- Age-specific expression of inbreeding depression;
- mating-system evolution;
Hermaphroditic individuals can produce both selfed and outcrossed progeny, termed mixed mating. General theory predicts that mixed-mating populations should evolve quickly toward high rates of selfing, driven by rapid purging of genetic load and loss of inbreeding depression (ID), but the substantial number of mixed-mating species observed in nature calls this prediction into question. Lower average ID reported for selfing than for outcrossing populations is consistent with purging and suggests that mixed-mating taxa in evolutionary transition will have intermediate ID. We compared the magnitude of ID from published estimates for highly selfing (r > 0.8), mixed-mating (0.2 ≤r≥ 0.8), and highly outcrossing (r < 0.2) plant populations across 58 species. We found that mixed-mating and outcrossing taxa have equally high average lifetime ID (δ= 0.58 and 0.54, respectively) and similar ID at each of four life-cycle stages. These results are not consistent with evolution toward selfing in most mixed-mating taxa. We suggest that prevention of purging by selective interference could explain stable mixed mating in many natural populations. We identify critical gaps in the empirical data on ID and outline key approaches to filling them.