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Wednesday, April 11 • 11:15am - 11:30am
CLIMATE CHANGE EFFECTS AND ADAPTATION: Climatic and Environmental Drivers of Population- and Species-level Phenology in a Common Garden Study

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AUTHORS: Jonathan Knott*, Benjamin Taylor, Songlin Fei – Purdue University

ABSTRACT: Many species shift their phenology as a response to climate change, but the mechanisms by which these shifts occur are relatively understudied. By using a common garden, we are able to assess the contribution of both historic climate of the seed source and the local environmental factors that drive phenological transitions. Here, we observed red oak phenology with different seed origin (32 populations across the eastern US) at a common garden in West Lafayette, Indiana, from 2013 through 2017. We assessed how populations vary in their phenology, and how this variability can be explained by climate conditions of their seed origin. We also assessed how local environmental conditions can drive annual species-level shifts in phenology. In general, we found that the timing of spring phenology events is associated with local environmental factors. Accumulated growing degree days account for most of the variability in spring phenology (R-squared = 62-91%), whereas the timing of leaf out is only weakly explained by seed source climate (such as mean annual precipitation, R-squared = 6-25%). However, the timing of leaf senescence is strongly linked to seed source climate (such as mean annual temperature, R-squared = 59-72%). In general, northern populations begin their growing season slightly earlier but are more limited at the end of season, leading to an overall shorter growing season compared to southern populations.

Wednesday April 11, 2018 11:15am - 11:30am CDT
LaSalle 1 (7th Floor)

Attendees (6)