About this episode
The Benefits of Restoring Aquatic EcosystemsFor over a century, native salmon populations in California have been adversely impacted by human activities such as mining, dam building, and overfishing practices, often leading to the loss of critical habitat and decreased genetic diversity. With additional environmental stress from climate change, such as rising surface temperatures and changes in freshwater temperature and flow, salmon populations have been quickly declining. In addition, dams trap salmon into the warmest parts of the watershed, where they are more vulnerable to predators and have decreased breeding area necessary for their survival. Salmon are an incredibly important marine species, often referred to as a keystone species, as they play an essential role in the health and function of an ecosystem. Not only are salmon ecologically beneficial through their ability to disperse nutrients throughout streams and rivers, but they are also culturally significant to Indigenous people. Indigenous culture has historic ties to salmon, including reliance on the species for sustenance and livelihood. As a result, indigenous tribes have a particular attachment to and concern for salmon, and issues such as diminished water quality and the burdens brought about by climate change have a deep resonance. In order to restore salmon populations, Indigenous groups and environmental activists have advocated for increased restoration of watersheds, the reopening and improving of ecologically important areas, and the removal of dams that block natural salmon spawning habitats. Dam Removal as Solution to Climate ChangeAs climate change reduces water flows in California and increases temperatures beyond which salmon can tolerate, certain populations of salmon have become endangered species. Drastically reduced population levels have brought about a wave of concern, as their absence can disrupt nutrient cycling, reduce food availability, and negatively impact the livelihoods of people who depend on salmon for sustenance, income and cultural value. The “California
