3.1 Provenance and site differentiation in tree survival
After 17 months of growth, we had on average 79% survival from the
original planting, however, losses were somewhat asymmetric across
species. The total explained variance from general linear models on
survival ranged from R 2 = 0.12 to 0.69 (mean
0.30) across species. 10/16 species showed significant effects of
provenance and/or site on survival, and six showed no effect (Figure 3a,
Table 1, Figure S3). In four species, A. fitzalanii , C.
ramiflorus, G. acutifolia, and M. elleryana , site alone
significantly affected survival. In two species (S. luehmannii ,
and N. dealbata ) provenance alone affected survival: the lowland
provenance had a higher survival rate than the upland provenance
irrespective of site for each species. For one species (H.
novo-guineensis ), survival was impacted by both provenance and site
with no interaction effect (Figure S3). For three species (C.
hypospodia , E. grandis , and T. ciliata ) there were
significant provenance × site effects on survival. In C.
hypospodia the lowland provenance had higher mean survival at all sites
but had greater provenance differentiation at Cow Bay compared to other
sites. For E. grandis , survival was slightly greater for the
upland provenance compared to the lowland provenance when grown at the
Cow Bay and Thiaki sites, but the opposite was observed when grown at
the DRO site. For T. ciliata provenance differentiation was only
significant at the DRO site, where the lowland provenance had a higher
probability of survival.