Climate drives among-year variation in natural selection on flowering time

2020-02-05T09:55:56Z (GMT) by Johan Ehrlén Alicia Valdés
data_indiv: This data set includes 22 years of data on flowering phenology and fitness of the perennial herb Lathyrus vernus , as well as climatic data from the same years (see below). Plant data was collected in a population of L. vernus in a deciduous forest in the Tullgarn area, SE Sweden (58.9496 N, 17.6097 E), during 1987–1996 and 2006–2017. In 1987, all flowering individuals in an area of 825 m2 were permanently marked and surveyed in each year to 1996. New flowering individuals in the plot were included in the study in each year. No recordings were made 1997–2005. In 2006, a new set of individuals in an area of 162 m2 within the same population were marked, and surveyed in the same way as the initially marked individuals to 2017. In total, we recorded 2411 flowering events, and followed 606 individuals 1987–1996, and 228 individuals 2006–2017.

climate_1961_2017: This data set includes climatic data from nearby stations for the period 1961-2017. Weather data for March, April and May 1961–2017 was obtained from the Swedish Meteorological and Hydrological Institute (www.smhi.se). Daily mean, minimum and maximum temperature values were averaged from two meteorological stations: Oxelösund (58.6777 N, 17.1223 E, 41 km from the study population) and Södertälje (59.2142 N, 17.6289 E, 29 km from the study population). Daily precipitation values were obtained from a third station located in Åda (58.9279 N, 17.5358 E, 5 km from the study population). We calculated 12 variables from weather data: monthly averages of daily minimum, mean and maximum temperatures, and monthly sums of precipitation, for March, April and May in the year of flowering.

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