As part of the Friday Seminar in the Institute of Biology, Professor Ingibjörg Svala Jónsdóttir at the Faculty of Life and Environmental Sciences, will give a presentation on her research:
During more than two decades valuable data has been collected within the research network International Tundra Experiment (ITEX) aiming at answering the question how climate warming affects tundra plant communities and ecosystems. The large number of research sites widely distributed across the tundra biome, the use of standardized protocols and the combination of experimental warming and monitoring make this network unique. Several data syntheses have provided groundbreaking insights into how climate warming affects growth and reproduction of individual tundra plants and tundra plant communities. In this talk I will focus on more recent synthesis of phenological data. As expected, they show that warming accelerates phenology in general. Furthermore, the syntheses reveal that plants at colder sites (high Arctic) are more sensitive to a given increase in summer temperatures than plants at warmer sites (low Arctic and Alpine), that warming shortens the flowering season for Arctic and alpine plants and more so for late flowering species than early flowering. I will discuss the implications of these differential phenological responses to warming for plant reproductive success, plant establishment and trophic interactions in tundra ecosystems.