Data for: Modeled seed accumulation patterns explain spatial heterogeneity of shrub recruitment within the taiga-tundra ecotone

The model-averaged relationship between these mechanisms and seedling abundance was then used to predict seedling recruitment across the Siksik creek sub-catchment by estimating the seed input from each hypothesized mechanism across 2000 random points. To validate these predictions and the resulting map, we selected 51 points across the basin and estimated seedling abundance by measuring the distance to the third nearest seedling from each point.

In addition to the grid and validation data, this dataset also includes information on the abundance of alder seedlings across topographic gradients at ten sites. Each site included transects running through alder patches, with sampling quadrats established above the patch, at the exterior and interior of both patch edges and at the patch centre. The patch transects were paired with transects in the adjacent alder-free tundra which included top, middle, and bottom sampling quadrats.

At each of these quadrats we established two 1 m2 vegetation plots in which we estimated ground cover abundance and counted the number of alder seedlings, allowing for the investigation of plot-level associations. Five of these sites were then selected for intensive ground cover surveys to investigate the proportions of seedlings growing directly out of specific ground cover types. For detailed methodological information see Wallace et al. 2024.

Modeled seed accumulation patterns explain spatial heterogeneity of shrub recruitment within the taiga-tundra ecotone. In review at JGR:Biogeosciences.