Salmon lose diversity in managed rivers, reducing resilience to environmental change

December 5, 2019
From the National Oceanic and Atmospheric Administration (NOAA)

The manipulation of rivers in California is jeopardizing the resilience of native Chinook salmon. It compresses their migration timing to the point that they crowd their habitats. They may miss the best window for entering the ocean and growing into adults, new research shows.

The good news is that even small steps to improve their access to habitat and restore natural flows could boost their survival.

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Authors of the research included scientists from University of California Davis, University of California Berkeley, U.S Fish and Wildlife Service, California Department of Fish and Wildlife, University of California Santa Cruz, Cramer Fish Sciences, University of California San Francisco, and NOAA Fisheries. Funding was provided by the U.S. Fish and Wildlife Service, California Department of Fish and Wildlife, and the Bureau of Reclamation.

Photo: Rachel Johnson, NOAA Fisheries/University of California, Davis

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SMUD Roseville Water Transfer comments

On September 10, 2019, the Environmental Council of Sacramento and Habitat 2020 sent a letter to Sacramento Metropolitan Utilities District (SMUD) a letter regarding a proposed water transfer between the City of Roseville and SMUD. Below are some excerpts from the letter, followed by a link to the letter in full.

Recently the Environmental Council of Sacramento and Habitat 2020 became aware of the pending temporary water transfer between the City of Roseville and SMUD. Our review of the environmental assessment and decision document prepared by the Bureau of Reclamation found specific deficiencies in the analysis and a casual dismissal of the transfer’s cumulative significance. We believe that the proposed transfer of water does not contain the necessary safeguards to protect Lower American River fisheries. We request that the SMUD Board direct its staff to include provisions in the contract that will address these concerns.

We believe the transfers must be governed by the standards and requirements contained in the Modified Flow Management Standard. These standards and requirements would much better ensure that the transfer would not negatively impact the American River flow and temperature standards.

Click here to read the full letter.

Photo by George Nyberg of the American River

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Some Like It Dark: Light Pollution And Salmon Survival

June 4, 2018

FISHBIO

The interaction between light pollution and predation could deal a heavy blow to species already struggling to survive. Bridges, in particular, often have lighting that shines into rivers at night, and attraction to these stationary lights can stop juvenile fish in their tracks as they migrate downstream, making them vulnerable to predators. Fish also frequently migrate and feed at night to hide from predators in the darkness, and bright lights shining on the water eliminate their protective cover. In rivers where salmon spawn, juvenile salmon can be especially impacted by bright nighttime lights or reflections on the surface of the water because predation is a major contributing factor to the high mortality of juvenile salmon. Light pollution from the iconic Sundial Bridge in Redding, California (shown above), was a suspected factor that contributed to the near loss of Sacramento River fall-run Chinook salmon from 2011–2013.

Click here to read the full article.

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