Reduced seed set under water deficit is driven mainly by reduced flower numbers and not by changes in flower visitations and pollination

- manipulation of water availability on wild mustard (Sinapis arvensis) using rain-out shelters - 3 treatments: well-watered, reduced watered, drought period; stem water potential was measured to conform plant's water stress and was used as the linear variable for further statistical analysis - "Foral_traits"-file: following parameters were measured once in three freshly open flowers per plant from a low, middle, and high position to avoid position and age effects: stamen, style, and calyx length, petal length and width, flower display size, and nectar volume. On two flowers per plant, we collected one anther each in order to count pollen grains by means of a microscope (after 3 weeks under treatment). For pollen and nectar collection, nearly open flowers were covered with mesh bags the day before collection in order to prevent access by flower visitors. The inflorescence size (greatest expansion) was measured once on five inflorescences per plant. Floral height (height of the highest flower) was measured weekly with a folding yardstick; means values were included in the data file and were used for statistical analyses - "Int_data"- file: plant-animal interactions were observed: each plant individual was observed daily; the number of visits by arthropods was recorded; the number of visits per day and per flower was calculated and used for further statistical analyses - "Scent_data"-filechemical (= floral scent) data were analyzed using a thermal desorption system coupled with a GC-MS; compounds were analyzed and identified using GCMSsolution package; compounds in flowers were compared with those found on blank controls; the amount of compounds was estimated by comparing peak areas with area of a standard (Octadecane C18); absolute compound amounts included in the data file - "Loggerdata"-file: raw data obtained from data loggers that were placed under each shelter; measured temperature and relative air humidity; one logger was placed next to the shelters and recorded temperature, relative air humidity, wind speed, photosynthetic active radiation PAR and air pressure - "Soil_humi_temp"-file: raw data of weekly measured soil humidity and soil temperature next to each plant individual using avolumetrix water content sensor (Hydrosense II, Campbell Scientific) and a simple thermometer (DET3R, Voltcraft) - "Plant_list"-file: file with individual plant information