Plant sampling and chemical analysis on Schiermonnikoog island (salt marsh site) For details on sampling scheme and chemical analysis methods see: Fokkema, Wimke, Wendy Boer, Henk P. Jeugd, Adriaan Dokter, Bart A. Nolet, Luit J. Kok, J. Theo M. Elzenga, and Han Olff. "The nature of plant adaptations to salinity stress has trophic consequences." Oikos 125, no. 6 (2016): 804-811. ID: sample ID Plot_name: plot name (transect = digit, position in transect = letter) Latitude: sample latitude in decimal degrees Longitude: sample longitude in decimal degrees Elevation: ground elevation in cm (mean sea level) Number_droppings: total number of goose excreta found Weight_droppings: total weight of the goose excreta found Veg_height_old_avg: vegetation height inside exclosure Veg_height_new_avg: vegetation height inside exclosure after moving to new location Date_collected: date of sample collection Period: sampling period (2-week periods) Species: plant species C: mass percentage Carbon on dry mass basis (by near infra-red spectrophotometry) N: mass percentage Nitrogen on dry mass basis (by near infra-red spectrophotometry) ADF: mass percentage acid detergent fibre goose droppings on ash-free dry mass basis (by near infra-red spectrophotometry) Sugarmass: mg sugar per gram dry weight (by near infra-red spectrophotometry):