[Ccb_faculty] Jon Keeley talk on fire-adapted flora

[Amy Litt]

Hello All, Jon Keeley is giving a zoom talk on October 16 and 7:00 pm that
some of you might find interesting (see below).  More information and
registration is here: https://www.csuchico.edu/herbarium/

Amy



*Evolution of the Fire-Adapted California Flora*

*Presented by Jon E. Keeley*

[image: Jon E. Keeley]

Over the past century much has been written on the evolution of the
California flora. Drivers of change have focused on the role of climate,
topographic relief, and substrates, however the role of fires as a
selective force has largely been ignored. Macrofossil data provide
convincing evidence that fires have been a regular feature of California
landscapes throughout the Cenozoic. Understanding how fire has shaped plant
adaptations requires recognition of the different fire regimes in a range
of ecoregions in the state. In this presentation I will explore fire
regimes in herbaceous, shrubland and forest types throughout the state and
how different regimes have selected for different fire-adaptations. Some
traits such as vegetative resprouting from burned skeletons appear to be
quite ancient and not always associated with fire. Others such as the basal
burls (lignotubers) that give rise to postfire resprouts in a few genera,
as well as smoke-stimulated seed germination of soil stored seed banks
evident in both woody and herbaceous taxa, date to the Miocene and are
associated with the rise of the Mediterranean climate, which increased fire
predictability. Looking forward I will discuss how global changes are
likely to alter fire regimes and their impact on different fire response
types.
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