62 news posts related to Freshwater

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DNA shows where Washington culvert replacements helped spawning salmon

people sample water in a stream at the mouth of a culvert

To help struggling salmon populations, the state of Washington is legally required to replace hundreds of culverts that divert streams under roadways. The state transportation department is replacing old, rusting metal pipes with broad, concrete promenades that provide more gradual gradients and gentler flows for salmon swimming upstream to access more spawning grounds. The full scope of the effort will last 17 years and cost $3.8 billion. 

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Fish, Forests and Fungi

Salmon River

Mushrooms have a long-standing history as a culturally and nutritionally significant food source, yet we still have much to learn about our fungal friends. Enter the wondrous world of mushrooms: some toxic, some colorful; some cap-tipped, some mimicking a wave in the ocean. Regardless of how much research has been done on fungi, we have only scratched the surface, with only four percent of fungi species characterized. 

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Thousands of baby sea stars born at UW lab are sign of hope for endangered species

Research assistant Fleur Anteau checks on year-old juvenile sunflower sea stars in the UW lab as research scientist Jason Hodin examines month-old sea star larvae under a microscope.

Just a few days shy of the first day of spring, scientists at Friday Harbor Laboratories on San Juan Island had reason to celebrate. Dozens of juvenile sea stars, no bigger than a poppy seed, had successfully metamorphosed from floating larvae to mini star — the important first step toward becoming an adult. Between now and then, these sunflower sea stars, the largest sea star species in the world, will grow up to 24 arms and a colorful body the size of a serving platter. 

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‘By-the-wind sailor’ jellies wash ashore in massive numbers after warmer winters

Velella velella, also called “by-the-wind sailor” jellies, that washed ashore at Moolack Beach, Oregon, in 2018.

As their name suggests, by-the-wind sailor jellyfish know how to catch a breeze. Using a stiff, translucent sail propped an inch above the surface of the ocean, these teacup-sized organisms skim along the water dangling a fringe of delicate purple tentacles just below the surface to capture zooplankton and larval fish as they travel. At the mercy of the wind, these jellies can wash ashore and strand — sometimes numbering in the trillions — on beaches around the world, including up and down the U.S. 

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Logging change in Puget Sound: Researchers use UW vessel logbooks to reconstruct historical groundfish populations

The R/V Commando passes through the Montlake Cut

To understand how Puget Sound has changed, we first must understand how it used to be. Unlike most major estuaries in the U.S. — and despite the abundance of world-class oceanographic institutions in the area — long-term monitoring of Puget Sound fish populations did not exist until 1990. Filling in this missing information is essential to establishing a baseline that would provide context for the current status of the marine ecosystem, and could guide policymakers in setting more realistic ecosystem-based management recovery targets. 

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