Table 1.
A list of the mechanisms that contribute to transient seedbank densities and the method of calculation for the effect sizes based on the differences between treatments.
The treatment plots that were used measured in shrub and open microsites included +P+S, +P-S, -P+S, & -P-S.
Fig 1.
The annual plant density and annual species richness for shrub and open plots in the Mojave National Preserve and the Panoche Hills in both years.
Each bar represents the mean with standard error.
Table 2.
Linear mixed models testing for differences in seed.soil among microsites (shrub/open) and each of the treatments that manipulated either annual plant density or the persistent seedbank.
The annual plant density of neighbouring annuals was included as a covariate. Significance at α < 0.05 is denoted by bolded values. The sign of significant effects were positive.
Fig 2.
The differences in seed.soil for each of the four treatments and in each microsite (shrub and open) for the Mojave National Preserve (MNP) and the Panoche Hills (PAN).
Each bar represents the mean with standard error.
Fig 3.
Transient seedbank (seed.soil) densities increase the size of the shrub at Panoche Hills, but not the Mojave National Preserve.
The solid line is mean model fit at mean of seed.soil residuals, i.e. after compensating for effect of annual plant densities on seedbank densities. (Panoche Hills: R2 = 0.20).
Fig 4.
The effect sizes of each mechanistic process in the shrub and open microsites that contribute to the transient seedbank (seed.soil).
The shrub arrow represents trapping effect only. Sites represented are the Mojave National Preserve in 2013 and Panoche Hills both in 2013 and 2014. Black arrows show significant effects (α < 0.05) based on confidence intervals calculated using the adjusted bootstrapped percentile (BCa) method and grey arrows represents non-significance.