Imagine a river teeming with life, where the return of the first salmon each spring is not just a natural event, but a sacred ceremony. This is the story of Oregon’s Coquille River, where science and Indigenous wisdom intertwine to reveal a deeper understanding of an estuary’s past, present, and future. For the Coquille Indian Tribe (CIT), the arrival of salmon is a moment of gratitude and connection. As Jason Younker, former CIT chief and assistant vice president of sovereign government-to-government relations at the University of Oregon, explains, ‘You come out and you welcome them.’ Neighbors share the first catch of the season, and fish bones are returned to the river—a ritual of thanks that fosters respect for the environment. ‘If you give thanks regularly and with intent,’ Younker adds, ‘you’re less likely to abuse the resources in front of you.’ But here’s where it gets controversial: while the CIT honors this tradition today, the region’s salmon haven’t always been treated with such care. In the 1800s, logging and grazing practices introduced by settlers devastated the estuary’s salmon population. Is it possible to reconcile this history of exploitation with the tribe’s deep-rooted stewardship?
Recent research from the University of Oregon, conducted in collaboration with CIT members, sheds light on this complex narrative. Presented at AGU’s Annual Meeting 2025, the study explores how the decline of salmon has impacted the Coquille River and Coos Bay estuary. The project began over a dinner conversation between scientists and Younker, where tribal knowledge sparked a groundbreaking idea: salmon aren’t just passing through—they’re delivering vital nutrients like nitrogen from the ocean to rivers and wetlands. ‘The bells in my head started ringing,’ recalls Katya Podkovyroff, a doctoral student in biogeochemistry and paleoecology. ‘If I’m looking at vegetation, salmon migration patterns would impact plant communities.’ And this is the part most people miss: the connection between salmon, soil, and the health of an entire ecosystem.
To test this hypothesis, researchers extracted meter-long soil cores from the estuary’s dry ground, creating a physical timeline of the land. By analyzing elemental indicators like carbon-to-nitrogen ratios, they discovered that sites with restoration efforts—such as dike removal and tree planting—showed lower carbon-to-nitrogen ratios and higher nitrogen-15 levels, similar to areas with thriving salmon populations. These findings suggest that salmon play a critical role in nutrient cycling, a role that was disrupted by their decline. But does this mean we can restore balance by simply reintroducing salmon? Or are there deeper systemic issues at play?
While soil cores provide valuable insights, they have limitations—each core represents just one specific spot, leaving questions about how nutrients arrived there. To address this, the team plans to analyze regional environmental DNA, offering a broader perspective on salmon’s historical presence. ‘That seems like a really interesting and unique way of using this kind of tool,’ notes Katharyn Boyer, a restoration ecologist unaffiliated with the study. The ultimate goal? To inform future restoration efforts while honoring Indigenous knowledge. ‘When we talk about science,’ Younker emphasizes, ‘we have to talk about Indigenous ways of knowing, too. They complement and augment the science that exists.’ But how can we ensure Indigenous knowledge is not just acknowledged, but actively integrated into scientific practices?
This research is more than a study—it’s a call to bridge gaps between traditional wisdom and modern science. As we move forward, the question remains: Can we learn from the past to create a sustainable future for our estuaries? What do you think? Share your thoughts in the comments—let’s keep this conversation going.
