Discussion
In this study we linked previous approaches that infer paternity with sibships or paternity with population parameters to jointly infer paternity, sibships and the pollen dispersal kernel in a hybrid zone of Antirrhinum majus. We find that dispersal is leptokurtic, with half of seeds being sired by pollen donors within 40m of the maternal plant, and remaining donors being spread up to more than 2km away. Using the dispersal kernel as a null distribution, we find than maternal plants towards the edges of the hybrid zone are more likely to receive pollen from the local parental subspecies than would be expected by chance. Below we discuss these findings and how they relate to maintenance of the hybrid zone.
This is notes from here on.
Male fitness as a mechanism of HZ maintenance
Parental genotypes have higher male fitness on their own side.
- This could be due to incompatibilities, but there don't seem to be any.
- Alternative is that pollinators make and active choice about where to forage.
- That could be for reasons like frequency dependence, good contrast with background, scent.
- Pollinators play an active role in selection on flower colour.
Matches Dave's pedigree.
- Can we compare numbers to see how much of total fitness differences this implies?
- Compare with tag assay and female fitness papers.
- Conclusion: pollinators are the agent of selection.
Biological relevance of dispersal shape/distance
If theres selection through male fitness, dispersal is somehow bounded, but that's beyond this paper. You'd need to fit an interaction term or something.
Could incorrect assignment affect results?
Deprecated paragraphs
Everything from here is old bits of notes.