[Ccb_faculty] Fwd: THIS THURSDAY - CalBotSoc Speaker: Dr. Regan Dunn

Tue Jun 6 22:23:14 PDT 2023

---------- Forwarded message ---------
From: The California Botanical Society <membership at calbotsoc.org>
Date: Tue, Jun 6, 2023, 10:17 PM
Subject: THIS THURSDAY - CalBotSoc Speaker: Dr. Regan Dunn
To: Amy Litt <amy.litt at ucr.edu>

"Drought, fire, extinction, and the formation of the modern chaparral of
Southern California in the latest Pleistocene"

Botany Speaker Series

Upcoming talk:

*Dr. Regan Dunn*
This Thursday!
*June 8th, 2023*
7-8 pm PT

"Drought, fire, extinction, and the formation of the modern chaparral of
Southern California in the latest Pleistocene*"*
[image: Photo of Regan Dunn smiling with hands on hips with tree branches
in the background. Photograph credit: John Weinstein]
<https://calbotsoc.us7.list-manage.com/track/click?u=c632809fa2b75323f2418bb1e&id=60ef89e2fe&e=b69ac08598>

Talk Description
  Debate over causation of the Late Pleistocene megafaunal extinction has
raged for 70 years. Although multiple hypotheses have been put forth, the
most widely accepted and debated are 1) over-hunting by humans, 2) climate
change, and 3) some combination of the two. The diverse and extraordinary
Late Pleistocene faunas preserved in the asphaltic traps at Rancho La Brea
(RLB) in Los Angeles, California are among the best in the world to test
these hypotheses because there are high numbers of individual megafaunal
species that can be precisely dated using ultra-filtration 14C radiometric
techniques. While a concurrent record of plants at the La Brea Tar Pits is
yet lacking, published pollen and charcoal records for Late
Pleistocene-Holocene sediments in Southern California exist from which
vegetation, fire and climate can be reconstructed along with a record of
human occupation estimated from archeological dates. Combined, these
records provide a high-resolution record of a profound and rapid ecosystem
state shift ~13,200 years ago that resulted in the extinction of the Ice
Age titans and formation of today’s coastal California environments.

* Join us this Thursday! March 8th, 2023 7-8 pm PT*
Zoom link
<https://calbotsoc.us7.list-manage.com/track/click?u=c632809fa2b75323f2418bb1e&id=9132952ee0&e=b69ac08598>
*Bio*
  Dr. Regan Dunn is the Interim Assistant Deputy Director and Assistant
Curator at the La Brea Tar Pits. She is a paleobotanist whose research
seeks to understand the interplay between climate, plants, and animal
evolution through time. She studies a variety of plant fossil types
including phytoliths, pollen, and macrofloras to reconstruct ancient
vegetation structure and composition. She has a PhD in Biology from the
University of Washington, a Master of Science in Botany from the University
of Wyoming, and a Bachelor of Science in Biology from Colorado State
University. Before coming to the La Brea Tar Pits, Dr. Dunn worked as a
paleobotanist for the Denver Museum of Nature & Science, the National Park
Service, the Burke Museum of Natural History and Culture, and the Field
Museum of Chicago. She has performed extensive fieldwork in South and
Central America, Mexico and in the western United States. At the La Brea
Tar Pits, Dr. Dunn’s research focuses on understanding vegetation change
over the last 50,000 years in the Los Angeles Basin and how the fossil
record informs us about future change.

  *Talk Zoom link: *
https://ucr.zoom.us/j/94620821807?pwd=SHRLVVR4WHlVTGtCUko4bVp1SkFiZz09
<https://calbotsoc.us7.list-manage.com/track/click?u=c632809fa2b75323f2418bb1e&id=a989ff4efb&e=b69ac08598>

*2023 Botany Speaker Series *

June 8: Regan E. Dunn, La Brea Tar Pits & Museum
July 13: Tadeo Ramirez Parada, UC Santa Barbara
August 10: Israel Borokini, UC Berkeley

*Want to give a talk in our botany speaker series? Email us at
membership at calbotsoc.org
<membership at calbotsoc.org;+rlolliff at berkeley.edu?subject=Botany%20Speaker%20Series%20Talk>*
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