In This Issue:

Upcoming Events

• “Historical Connections Between Canada and American Immigration Policy”

Program News

• Hildebrand Fellow Joshua Zimmt pieces together the link between climate change and the first mass extinction of animal life

External Events

• “How Americans Helped Shape Canada, and Why this Matters”

UPCOMING EVENTS

Historical Connections Between Canada and American Immigration Policy

Wed., Feb. 1 | 12:30 pm PT | 223 Moses | RSVP here

Canadian Studies faculty affiliate Hidetaka Hirota will explore historical connections between Canada and American immigration policy in the long nineteenth century. Based on his earlier and current works, Professor Hirota will discuss three aspects of this history: Canada as a destination of deportation from the United States; Canadians as targets of restrictive immigration policy; and Canada as a potential ally of the United States in migration control. In doing so, he will illuminate the experiences of Irish migrants in the mid-nineteenth century, Canadian migrants in the late nineteenth century, and Japanese migrants in the early twentieth century. These migrant groups’ experiences demonstrate that Canada remained an important part of the history of American immigration policy.

About the Speaker

Hidetaka Hirota is a social and legal historian of the United States specializing in immigration, and an associate professor of history at UC Berkeley. He is particularly interested in the history of American nativism and immigration control. His first book, Expelling the Poor: Atlantic Seaboard States and the Nineteenth-Century Origins of American Immigration Policy, shows how an influx of impoverished Irish immigrants to the United States in the early 19th century led nativists to develop policies for deporting destitute foreigners to Europe and Canada, and laid the groundwork for later federal legislation. His current projects include an examination of long-running tensions between nativism and a demand for migrant labor in the United States, as well as an exploration of the Japanese immigrant experience before 1924.

PROGRAM NEWS

Hildebrand Fellow Joshua Zimmt Pieces Together the Link Between Climate Change and the First Mass Extinction of Animal Life

By Joshua Zimmt

Joshua Zimmt is a Ph.D. candidate in the Department of Integrative Biology and UC Museum of Paleontology at UC Berkeley. He holds a B.S. in geology from the College of William & Mary. His research focuses on the link between climate change and its impact on the history of life, integrating geological, paleobiological, and geochemical data into a comprehensive understanding of past events. He received a Hildebrand Graduate Research Fellowship in Summer 2022 to conduct fossil excavations in Québec that reveal a link between climate change and the first mass extinction of animal life.

Climate change is one of the most pressing issues in the world today: the effects of our warming planet are all around us, with worsening droughts, rising sea levels, and catastrophic weather events featured across the news. Climate scientists have developed sophisticated models that can predict how and why this warming trend will worsen in the years to come. However, these models cannot tell scientists what the impact of global warming will be on species and ecosystems around the world. This gap in our knowledge is critical for adapting to and planning for our changing planet. Fortunately, we can use the fossil record to study past episodes of climate change and how they affected life on Earth to better understand the impact of modern

climate change on the natural world.

As a paleobiologist, I am motivated by the promise of using the past to help contextualize the present and make predictions about the future. In my work, I combine the disciplines of geology, biology, and chemistry to produce integrative perspectives of climate-driven events throughout the history of life. Investigating the geologic and fossil records of these events provides us with case studies of how life on Earth responds to climate change, but the interpretation of these events is complicated by climate-driven changes in sea levels that shape the geologic record. To solve this problem, I have developed a new method of studying the geologic and fossil records that combines high-resolution data from across a region into a comprehensive assessment of a climate-driven extinction event (Zimmt et al., 2021).

One of the most impactful climate-driven extinction events was the first major mass extinction of animal life, the Late Ordovician mass extinction. Nearly 445 million years ago, the Late Ordovician mass extinction eliminated ~80% of species diversity during a period of major climate change. The onset of the mass extinction is associated with global cooling and an abrupt fall in sea level, while the end of the event is associated with global warming and a rapid rise in sea level. However, it is not clear what aspect of climate change (cooling, warming, or some climate-driven change) drove the mass extinction. The application of my new method to the fossil and geologic records of the Late Ordovician mass extinction could therefore provide invaluable insight into this important extinction event.

To meaningfully apply my new method to the Late Ordovician mass extinction, I needed to choose a region with both exceptional fossil and geologic records. For over a century, Québec’s Anticosti Island has been visited by paleobiologists looking to study the Late Ordovician mass extinction. Across the 200-km long island, layers of rocks and fossils recording millions of years of life from an ancient ocean are beautifully exposed in coastal cliffs and river canyons. These qualities make Anticosti Island one of the best regional records of the Late Ordovician mass extinction and thus a promising target to implement my new approach for studying climate-driven mass extinctions.

Over the course of the field season, we meticulously measured and described the geologic record of eastern Anticosti Island, visiting 17 field sites that spanned the Late Ordovician mass extinction. Our observations demonstrated that that the geologic record of Anticosti Island was far more complex than any researcher had previously recognized. We found evidence for several major climate-driven cycles in sea level during the Late Ordovician mass extinction, indicating a series of warming and cooling intervals during the extinction event. Working together, we were able to develop a framework that used these oscillations in sea level to correlate the geologic record across our field sites. This represents a critical step forward in our knowledge of one of the best regional records of the Late Ordovician mass extinction and will enable us to develop a high-resolution sequence of both climatic and biological events throughout the Late Ordovician mass extinction.

While this field season is the first step in applying my approach for studying climate-driven mass extinction events to the record on Anticosti Island, our findings have global significance. The recognition of several major warming and cooling cycles during the Late Ordovician mass extinction suggests that the traditional interpretation of the mass extinction is likely over-simplified and requires a more thorough assessment of the geologic and fossil records. Moving forward, I will incorporate geochemical and paleobiological data from my research into our new correlation framework. The integration of geological, geochemical, and paleobiological data into this framework will provide us with unprecedented resolution that we can then use to determine the relationship between climate change and the Late Ordovician mass extinction.

More information on Joshua’s research on Anticosti Island can be found on the UC Museum of Paleontology site, here.

EXTERNAL EVENTS

How Americans Helped Shape Canada, and Why this Matters

Wednesday, Jan. 18 | 10:00 a.m. PT | Online | RSVP

Western Washington University’s Center for Canadian-American Studies invites you to the first talk in a new speaker series, “Why Canada Matters“. Historian Claire Campbell will visit some places and moments where Americans occupied or altered landscapes to the north, and in the process helped shape Canada’s borders, politics, and identity. Her talk will also explore the environmental implications of this shared history. Dr. Campbell is a professor and chair of history and affiliate faculty in environmental studies & sciences at Bucknell University, where she teaches environmental history, including Early America, cartography, urban history, and coastal history.

This talk is co-sponsored by WWU’s College of Humanities and Social Sciences and Department of History, and delivered in partnership with the WWU Alumni Association.