Skaien and Arcese_P. congesta geographic data_Journal Ecology

Tab 1 (“Geographic Survey Fruit Frequency”): Data were collected throughout the Georgia Basin from 2005 to 2014 (“Year”) from April to June of each year. Populations that were surveyed more than once were assessed for changes over time, and only the most recent measurement was included in the data set. The study species is seablush, Plectritis congesta. “Area” and “Location” together represent each population. “Isl.Main” represents whether a population was on an island or the mainland (with Vancouver Island considered as part of the mainland). “Deer” represents whether the island had deer present, absent or rarely hosted deer. UTM coordinates are represented by “N” for Northing and “E” for Easting. The number of wingless fruits in each set of 100 (“value”; from counts of 20 individuals in 5 different areas of the population) is represented by “sum.ww”. Together, “value” and “sum.ww” create the proportion of plants bearing wingless fruits (“Freq.of.ww”). “PC1” and “PC2” represent the values from the Principal Components Analysis (PCA) for climatic variables (see Appendix). The amount of land in a 1 km buffer (“1km_Area_Land”) was transformed into a percentage (“1km_Percent_Land”). From this, we also have the percentage of land area that is water in a 1 km radius of the center of the surveyed population (“1km_Percent_Water”).

Tab 2 (“1 m belt transects”): Data were collected from May to June 2014. “Location” represents the population sampled, accompanied by UTM GPS coordinates (“N” for Northing and “E” for Easting). The average measured heights of 20-40 plants along each transect is represented by “avheight”, with the standard deviation of height represented by “stdevheight”. The average depth of 5 measurements at 20 cm intervals along the 1 m belt transect is represented by “avdepth”, and the standard deviation in depth is represented by “stdevdepth”. The “Freq.of.ww” represents the proportion of fruits that were wingless from the total count of 100 (“value”). “PC1” represents values from the Principal Components Analysis (PCA) for climatic variables (see Appendix). “1km_Percent_Water” represents the percentage of land cover that was water in a 1 km radius of the center of the surveyed population.