|Planting Buloke trees on the heavily cleared Wimmera plains |
of western Victoria. (Photo: John Morgan)
The two most common explanations that are used to justify / defend this approach are that (i) local seed produces plants that are best adapted to the revegetation site (the 'local adaptation' hypothesis) and (ii) using local seed reduces the risk of causing outbreeding depression (i.e. the introduction of novel genes that will swamp the local genotype). I, too, have tended to use these concepts to underpin my thinking on this issue. But, on reflection, I've started to change my mind on this, for two reasons.
|Swainsona spp. are now extremely rare in grasslands.|
(Photo: John Morgan)
Recommendations for provenancing based on dispersal distance from parental plant (Figure 3 from Sgro et al. 2010)