The Quanta Podcast What Happens When Lakes Stop Mixing
Dec 2, 2025
Rachel Nuwer, a science journalist and Quanta contributing writer, shares her field experiences at Crater Lake, revealing the lake's striking clarity and its ecological importance. They discuss how climate change is affecting lake mixing and the potential consequences, such as oxygen loss and toxic blooms. Nuwer contrasts Crater Lake with Northern Italian lakes facing severe mixing issues and highlights the need for local interventions. The conversation dives into the challenges of monitoring these vital ecosystems and reflects on the relationship between humans and nature.
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Introduced Species Harm Native Newt
- Crater Lake hosts very few species; fish like rainbow trout and kokanee salmon were introduced for sport.
- Introduced crawfish decimated the endemic Mazama newt and its prey, nearly extirpating the newt.
Warmer Nights Strengthen Stratification
- Warmer nights prevent surface cooling, strengthening a thin warm surface layer and steeper stratification.
- Stronger stratification makes the same wind energy less able to mix surface and deep waters.
Less Mixing Makes Water Clearer
- A thinner, non-mixing warm surface layer constrains phytoplankton habitat and reduces summer biomass.
- This paradoxically makes Crater Lake even clearer during summer months.
