Supporting Information

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Fig. 4. Clonal map of a Zostera marina meadow. The spatial structure of genotypes and location of target clones as donor material for the experiment are shown. Samples were taken at 33.3-cm intervals. Each number refers to a unique genotype. Zeros represent canopy gaps. Colored areas represent the eight largest genotypes, six of which (designated A–F) were chosen for the experiment.

Fig. 5. Experimental layout of field experiment on the effects of eelgrass genotypic diversity. All blocks were arranged parallel to the shore in a depth of 1.6–1.8 m. Distance among blocks was 2 m. Letters refer to the clone designation. Each subplot measured 50 × 50 cm.