Table 3.

Data dictionary for vascular plant community composition (dataset i-b) from elevational gradients with and without nutrient input from a seabird colony, in Bjørndalen and on Lindholmhøgda, respectively, near Longyearbyen, Svalbard.

Variable name	Description	Variable type	Variable range or levels	Units	How measured
Year	Year of sampling	numeric	2018 - 2018	yyyy	recorded
Date	Date of sampling	date	2018-07-17 - 2018-07-21	yyyy-mm-dd	recorded
Gradient	Elevational gradient; C = reference, B = nutrient input gradient input (seabird colony)	categorical	B - C		defined
Site	Site as a number 1–7	numeric	1–7		defined
PlotID	Plot ID from A to G	categorical	A - G		defined
Taxon	Species name including genus and species	categorical	alopecurus ovatus - unknown sp		identified
Cover	Estimated species cover	numeric	0–70		recorded
Fertile	Numeric value indicating if an indiviual is fertile (1; i.e. presence of buds, flowers, and seeds) or not (0).	numeric	0–10		recorded
Weather	Weather during sampling	categorical	cloudy - windy		recorded
Elevation_m	Elevation of site	numeric	9.759 - 238.159	m a.s.l.	recorded
Longitude_E	Longitude of site	numeric	15.34 - 15.712	Degree east	recorded
Latitude_N	Latitude of site	numeric	78.207 - 78.239	Degree north	recorded

The dataset contains 698 observations of the covers of 50 taxa in 63 vegetation plots sampled at the two elevational gradients in 2018. Variable names, description variable type, range or levels, units, and short description is given for all variables.