In 1980-1982, six transplant gardens were established along a latitudinal gradient in interior Alaska from Eagle Creek, AK, in the south to Prudhoe Bay, AK, in the north (Shaver et al. 1986) .Three sites, Toolik Lake (TL), Sagwon (SAG), and Prudhoe Bay (PB) are north of the continental divide and the remaining three, Eagle Creek (EC), No Name Creek (NN), and Coldfoot (CF), are south of the continental divide. Each garden consisted of 10 individual tussocks transplanted back to their home-site, as well as 10 individuals from each of the other transplant sites (n = 10; 6 populations x 6 sites x 10 replicates = 360 total individuals).

All gardens were censused in 1983. The number of flowers for each tussock was counted. For a haphazardly chosen subsample of tillers ( n = 3) on each tussock, the total number of green leaves was counted and the length of the longest leaf was measured from the top of the sheath. The width of the longest leaf was measured with an optical comparator. Old leaves that were initiated the previous year were identified by a dark band with dead tissue above it, whereas new leaves had no such band. A tiller size index was calculated by multiplying the length of the longest leaf by the total number of green leaves (usually 2, 3 or 4). This tiller index is highly correlated with tiller mass (Shaver, Fetcher & Chapin 1986).

In this census, we also measured tiller size index at five additional gardens, Kuparik River (KUP), Galbraith Lake (GAL), Old Man Camp (OLDMAN), Atigun Pass (ATIGUN), MS119 (MS119) and for two additional populations Kuparik (KUP) and Galbraith (GAL). In addition, we measured number of green leaves and length of the longest leaf for 10 untransplanted tussocks at each garden. These are designated by CONTROL.

Bennington CC, Fetcher N, Vavrek MC, Shaver GR, Cummings KJ, McGraw JB (2012) Home site advantage in two long-lived arctic plant species: results from two 30-year reciprocal transplant studies. Journal of Ecology 100:841-851

Shaver GR, Fetcher N, Chapin FS (1986) Growth and flowering in Eriophorum vaginatum - Annual and latitudinal variation. Ecology 67:1524-1535

Fetcher, N., and G. R. Shaver. 1990. Environmental sensitivity of ecotypes as a potential influence on primary productivity. American Naturalist 136:126-131.

Notes:

Tiller size data are incorporated in Fetcher and Shaver 1990.
This data was collected with support from the School for Field Studies.