Original data for article: Present environmental fluctuations drive species’ competitive success in experimental invasions

marcescens, which had also evolved in either constant or fluctuating temperature. Moreover, the competition experiments were conducted in environments with similarly constant or fluctuating thermal conditions. The results showed that temperature fluctuations during competition, i.e. on an ecological timescale, made the invader more successful. Surprisingly, we did not find that the invaders’ or its competitor species’ evolution in fluctuating environments would have influenced the outcome of the competition. Our study highlights the importance of the present environmental fluctuations in promoting species’ competitive success and potentially facilitating biological invasions.