I am thinking about an invasive species that was introduced into North America just a few (<20) generations ago. Using microsatellite genotypes (105 loci), I have identified almost no significant linkage across the genome. I'm tempted to speculate that this has something to do with rapid population expansion that has caused LD to decay that quickly, but I'm not sure whether this is a reasonable train of thought. Can anybody think of why this might or might not be the case?
It is certainly possible as yes, rapid population growth will reduce LD. From Slatkin, 1994:
See also box 1: