Title: Data from: Spatiotemporal variability in the structure of seagrass meadows and associated macrofaunal assemblages in southwest England (UK): using citizen science to benchmark ecological pattern DOI: doi:10.5061/dryad.r06g604 Journal: Ecology and Evolution Journal manuscript number: ECE-2018-11-01398 Descriptions of variable headings for subtidal seagrass surveys A:Day - Numeric dd format B:Month - Numeric mm format C:Year - Numeric yyyy format D:Season - The season in which the survey was conducted E:Time.start - 24hr format F:Time.end - 24hr format G:Location - Code identifying larger marin survey areas H:Site - Code identifying individual survey sites I:SiteName - Descriptive name for each survey site J:Lat - The latitudinal coordinate for the site. WGS84. Decimal Degrees. K:Lon - The longitudinal coordinate for the site. WGS84. Decimal Degrees. L:Quad - Code identifying each 0.25m^2 quadrat. Nested within Year/Site/Pair M:Pair - Code identifying each surveyor pair. Nested within Year/Site N:Confidence - Classification of surveyor pair experience [Ranging from A (worst) to C (best)] O:Sample - Code identifying each 0.25m^2 quadrat. Nested within Year/Site P:nShoot - Number of seagrass shoots in 0.25m^2 quadrat Q:SeagrassPA - Binary indicator of seagrass presence-absence R:DensityCat - Categorical classification of seagrass density [A = 0, B = 1-5, C = 6-10, D = 11-18, E = >18 seagrass shoots per quadrat] S:Abundance - Total faunal abundance in each quadrat (equal to sum of V:AD) T:Phyla - Number of different taxonomic units in each quadrat (count of non-zero values V:AD) U:Depth - Diver depth in meters (not corrected to chart datum) v-AD:Ascidians:Worms - Number of each taxonomic unit in 0.25m^2 quadrat