
On summer mornings along the shores of the Great Lakes, Kalamazoo College student Luke Werner ’26 recognizes the rhythm of the water as something almost instinctive, shaped by years of fishing trips, charter boats and stories of salmon runs. And what began as a personal connection to Michigan’s waters became something far more ambitious: a deep historical investigation into how those waters were nearly lost and what their past can teach us about protecting them today.
Werner spent the past year immersed in archives, government reports and decades-old ecological data to complete his Senior Integrated Project (SIP). Unlike many sustainability-focused projects rooted in biology or environmental science, Werner’s work emerged from the history department—an intentional choice that underscores a central argument of his research: understanding environmental crises requires an understanding of the past.
His project traces the rise, collapse and partial recovery of fish populations in the Great Lakes, revealing how human decisions over centuries, rather than a single ecological disruption, set the stage for disaster.
“I wanted to go back and really look at the history of the region,” Werner said. “We tend to latch onto big moments, including the invasions and the tipping points. But the more I learned, the more I realized those were just the final dominoes.”
A Crisis Centuries in the Making
Long before invasive species such as sea lampreys and alewives devastated the lakes in the mid-20th century, the ecosystem had already been strained by human impact. Werner points to a gradual shift away from the reciprocal relationship Indigenous communities such as the Anishinaabe had with the land.
“The crisis wasn’t just caused by these fish showing up,” he said. “It was enabled by hundreds of years of decisions, including overfishing, damming rivers and pollution. We refused to cooperate with the lakes.”
By the time invasive species entered through shipping routes and canals, native fish populations were already vulnerable. The result was catastrophic as sea lampreys decimated large fish, while alewife numbers escalated.
“It genuinely became an international crisis,” Werner said. “You had industries collapsing, thousands of jobs lost, and entire ecosystems out of balance.”
The Man Behind the Salmon
In the 1950s, Howard Tanner, a fisheries biologist, was at the center of the most pivotal response to that crisis, as his bold proposal helped reshape the Great Lakes.

Sustainability SIP Symposium Scheduled
Kalamazoo College will celebrate Environmental Education Week April 20-24. Events will include the annual Sustainability SIP Symposium on April 22, which is Earth Day, from 6:30 to 9 p.m. at the Arcus Center for Social Justice Leadership. The event will honor more than a dozen students from a variety of majors who pursued themes of climate change, the environment, and sustainability in their research and projects. For more information, watch envirostewardship.kzoo.edu.
Tanner, who had experience studying salmon in the Western United States, proposed introducing Pacific salmon, specifically coho and Chinook, into the Great Lakes as a biological control for alewives.
“He knew salmon were strong, cold-water fish that could survive in the lakes,” Werner said. “And more importantly, they prey on alewives.”
At the time, the idea was far from an assured solution. Introducing another non-native species carried risks, especially in an already unstable ecosystem. But Tanner framed it as a calculated, science-driven intervention.
“It was a gamble, but it was an intentional one,” Werner said. “That’s the difference. These fish were chosen.”
Within a year of Tanner’s proposal, hundreds of thousands of salmon were released into the lakes. The alewife populations plummeted, and a new recreational fishing economy took shape.
“Tanner’s work didn’t just help stabilize the ecosystem,” Werner said. “It created this entire multi-billion-dollar recreational industry that still exists today.”
A Solution That Requires Constant Attention
Werner is careful not to describe the salmon introduction as a clean victory.
“It’s more like it was managed into something sustainable and only with constant effort,” he said.
Today, fish populations in the Great Lakes are still carefully balanced through a combination of stocking decisions, invasive species control and strict regulations. Too many salmon can deplete alewife populations, which in turn harms the salmon themselves. Too few salmon allow alewives to rebound.
“It’s a cat-and-mouse game,” Werner said. “They actually have to adjust how many salmon they introduce each year to keep everything in balance.”
That balancing act extends beyond species management. Werner points to modern environmental protections such as limits on commercial fishing, pollution controls and habitat preservation as direct responses to past failures.
At one point, Michigan alone had more than 10,000 commercial fishing licenses. Today, that number has dropped to just a few dozen.
“That’s one of the biggest changes,” he said. “We’ve shifted from this mindset of extraction to something much more intentional.”
Why History Matters
For Werner, the most important takeaway from his project isn’t just what happened, but how we understand it.
“It’s really critical to analyze and reflect on our past,” he said. “We repeat the same mistakes all the time if we don’t.”
By placing environmental issues in a historical context, his work reveals the complexity behind them, showing that crises are rarely sudden and solutions are rarely simple.
“Being a history major, it’s impossible for me to take things at face value,” Werner said. “There are always layers—economic, social, political—that shape what happens.”
That perspective, he argues, is essential for anyone working in sustainability.
“I wanted to move beyond the big headlines, the big titles, and the simple understanding of history and look at the myriad causes of these issues from the late 1600s through the 1950s,” he said. “Realistically, there were hundreds of different factors that led to this crisis.”
Looking Ahead
As Werner considers a future in environmental work—whether with state agencies, conservation groups or fisheries management—his SIP serves as a capstone and a starting point. What began as a personal connection to the Great Lakes has evolved into a deeper understanding of how fragile yet resilient those systems can be.
“It’s changed how I see the lakes,” he said. “It’s not just about what’s in them, it’s about our relationship with them.”
As his research clarifies, that relationship—shaped over centuries—will determine how the Great Lakes are sustained for generations to come.
“If we could get some agreements between governments—even if it’s just state and provincial governments—I think that would be a big boon for the environmental and economic success of the region,” he said.














































