Ecosystem thinking

I recently participated in a panel discussion entitlted A Journey in Fisheries and Ecosystem Thinking: A Conversation About the Past, Present, and Future.* This was an excellent opportunity to reflect on my experiences related to ecosystem-based management. I share some of those below.

* Click on the link above to view the recording of the discussion.

When I hear the term “ecosystem-based management” or “ecosystem thinking,” I think of connections – connections among different people who have different goals and values for ocean places, connections among barnacles, mussels, and seaweeds living in the rocky intertidal zone, and connections among people, place, and the more than human world. 

Many people have helped me learn about those connections, and the folks I participated in this panel discussion are among those from whom I have learned so much: Robin Alden; Joshua Stoll; and Jessica Bonilla.

Maine’s marine intertidal ecosystems have been part of my scientific life for more than 30 years.

I met Robin Alden, founding Executive Director of the Maine Center for Coastal Fisheries, for the first time when I visited Isle au Haut, an island off the Maine coast, nearly 30 years ago. The conversation we had about the connection between Maine marine ecosystems and the people who rely on them was formative for me, as were a number of other conversations that I had with Maine marine resource managers, conservationists and scientists at that time.

I carried those conversations with me, as I moved west to Oregon for doctoral work. At Oregon State University, advised by Profs. Jane Lubchenco and Bruce Menge, I learned to be an ecologist. I learned to pay attention to how humans and other living beings interact with one another and the world around us. I also learned more about the deep and varied connections that people have with coastal and marine places.

My PhD dissertation had a very long title, as many do: Advancing the science of marine reserves: From field experiments to tools for marine conservation planning. I had the good fortune to spend many hours on my hands and knees watching barnacles and learning how the environment shapes their behavior, ecology, and populations. I was particularly interested how variation in ocean conditions impacted barnacle reproduction and how what we could learn from studying accessible tidepool communities like those where these barnacles live might enable us to do a better job of managing people’s interactions with ocean organisms and ecosystems at larger spatial scales.

During my graduate work, I also spent a fair bit of time in meeting rooms and in front of the computer, synthesizing and sharing data on the rapidly emerging science of marine protected areas. Some of my PhD work contributed to the design of a network of marine reserves and other marine protected areas in the Channel Islands of California, and another study I led enabled me to study how conservationists were designing and implementing MPAs globally.

When I finished my PhD, I realized I still had research questions I wanted to tackle. So I went on to a postdoctoral fellowship with Prof. Simon Levin at Princeton University. There I co-edited one of the first books on marine ecosystem-based management, Ecosystem-Based Management for the Oceans.

Josh Stoll, moderator of this panel, asked me why I wrote the book. The short answer is: I was asked to. My PhD mentor, Jane Lubchenco, is very good at sharing opportunities. When she explained to my co-editor Karen McLeod and me that Island Press was interested in publishing a book on marine ecosystem-based management, and that she thought we’d be good people to lead the effort, the book began to take shape. Over the next several years, we collaborated with more than 40 other people to create the volume. The book covered everything from the ethics of ecosystem-based management to law and policy to the science and practice of this emerging field.

Heather Leslie and Karen McLeod in 2011 at University of Washington’s Friday Harbor Laboratories.

While I am very proud of the book we published in 2009, and the impact our collective work has had on the science and practice of ecosystem-based management, what I am most proud of is the community we helped to create during the process of drafting the book. In the process of identifying key themes for the book and figuring out how to write about them in a coherent way, we developed a shared understanding of the state of ecosystem-related science and management of the oceans, particularly in North America. That shared understanding helped support later research and policy development, such as the drafting of the US’s first National Ocean Policy in 2010.

By the time we finished the book, I realized that my next research project already was clear. We had lots of theory about ecosystem-based management, but fairly little empirical work on how it played out in practice and what worked and why. I turned my attention to documenting ecosystem-based management in practice in multiple places around the world. As that body of work developed over the last 15 years, I also was able to identify places where more or different scientific knowledge would be helpful and that has kept me in the field, doing ecology and learning how to do social science fieldwork, both in New England and also in Mexico.

During the book project, I realized that one of the parts of research that I particularly enjoy is helping other researchers talk with each other and identify research challenges that they can tackle together. Since then, I have helped co-design and co-create research projects with people who have many different kinds of expertise and experiences, including other scientists, as well as community members, resource managers, and other partners outside of academia. When I can see that a project has made a real impact on my community, that has been particularly rewarding.

UMaine students in the field, September 2025.

In 2023, we were awarded a grant from the US National Science Foundation to develop the Ecosystem Science National Research Traineeship (NRT) program. This is an opportunity support graduate students and my fellow faculty in becoming synthesizers and translators of ecosystem science knowledge and tools. Thanks to this program, we have recruited students to UMaine from all over the country to learn how to do ecosystem science and to support ecosystem-based management better. Together, we are exploring what comes next in this field, both in terms of the scholarship and its applications. If you are interested in joining us, please check out our program website at https://umaine.edu/ecosystem-science/ or reach out to me directly at heather.leslie(at)umaine.edu.

Thank you for reading!