Table 1.

Parameters and data gathered from the literature search.

Search criteria	Search parameters
Seedling observation period	Year and month of observation
	Establishment year of seedlings
Location characteristics	Country
	Region
	Exposure level (sheltered vs. exposed)
	Name of locality and sites (when available)
	Geographical coordinates (latitude N and longitude E)
	Human pressure level (high, moderate, low)
	Management measures of protection
	Presence of well-established P. oceanica meadows
Habitat characteristics	Maximum and minimum depth of seedlings
	New substrate areas, previously colonized areas (dead “matte”) or seagrass bed
	Substrate type (sandy substrate or rock substrate)
Seedling data	Abundance (number of seedling m-2 or total number of sampled seedlings at each locality/site)
	Seedling age at the time of observation
	Survival (percentage of seedlings survived in each locality/site at the end of the monitoring period when available)
	Formation of new rhizome branches (yes or not)