MEGA-PEARLS Part 4-Climate, Bay-Delta Science Conference, April 2021

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sunset delta climate map
29
Apr

MEGA-PEARLS Part 4-Climate, Bay-Delta Science Conference, April 2021

A Stream of Science Takeaways. ESTUARY News sent reporters to the biennial Bay-Delta Science Conference in September. This special edition of Pearls shares more than 20 takeaways.
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28
Apr

Science-in-Short ~ Marsh Sediment Podcast

Drift, Drop or Floc? Tailing Sediment as it Moves Through Marsh Margins This June two USGS scientists will be trying to get as close as they can to the edge of the South Bay’s Whale’s Tail Marsh to lay out their tools: tiles, filter paper, current profilers, and other sediment accretion measuring instruments. Estuary Reporter Ariel Rubissow Okamoto interviews reseachers Jessie Lacy and Karen Thorne about what they’re looking for at the marsh edge, and how it may help us answer burning questions about the future of the region’s wetlands. Is there enough sediment in the system to help them keep pace with sea level rise by buildng up their elevations naturally, or do humans need to sprinkle some sediment...
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pesticide resistance delta map
28
Apr

MEGA-PEARLS Part 3-HABs & More, Bay-Delta Science Conference, April 2021

A Stream of Science Takeaways. ESTUARY News sent reporters to the biennial Bay-Delta Science Conference in September. This special edition of Pearls shares more than 20 takeaways.
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photo of salmon injection USFWS
21
Apr

MEGA-PEARLS Part 2-Fish-Birds, Bay-Delta Science Conference, April 2021

A Stream of Science Takeaways. ESTUARY News sent reporters to the biennial Bay-Delta Science Conference in September. This special edition of Pearls shares more than 20 takeaways.
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Above: Lewis holding white sturgeon in Delta. Photo: Jim Ervin
20
Apr

MEGA-PEARLS-Part 1-Diversity, April 2021

A Stream of Science Takeaways. ESTUARY News sent reporters to the biennial Bay-Delta Science Conference in September. This special edition of Pearls shares more than 20 takeaways.
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23
Mar

Delta Study Predicts Stronger Floods and Less Water Supply

Though most don’t realize it, practically all Californians are linked to the Bay-Delta region via its triple function as a source of drinking water for some 27 million Californians, a critical water provider for the Golden State’s hefty agricultural industry, and a rich and unique ecosystem. But for those who live in the legal Delta zone – some 630,000 people – the braided weave of the Sacramento and San Joaquin Rivers and their maze of associated wetlands and levees provides a place of home, community, and recreation. And, as a recent study by the Delta Stewardship Council shows, climate change is tugging on the watery thread holding it all together. “Two-thirds of Californians get their water from here, which is...
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23
Mar

Dutch Slough Laboratory

For a hawk’s-eye view of one of the Estuary’s most ambitious restoration efforts, visit the Dutch Slough Tidal Marsh Habitat Restoration Project’s YouTube channel. Drone-shot footage shows what the Department of Water Resources has been doing on 1,200 acres of former wetland, converted to pasture and subsided up to 15 feet, in the West Delta between Big Break and Jersey Island. After moving millions of cubic yards of soil to elevate the marsh plain, a team of engineers, scientists, and contractors led by project managers Katherine Bandy of DWR and Mark Lindley of Environmental Science Associates has carved channels and created a basin-and-range landscape on the Emerson and Gilbert parcels, the western two-thirds of the project site. “We spent a...
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23
Mar

Scientists Nail Climate Links to Extreme Events

While a supermajority of Americans finally believe we are warming the world, a 2020 Yale Climate Opinion survey shows that most people still aren’t very worried about it. “Climate change is abstract to them,” says UCLA climate scientist Daniel Swain. “They don’t connect it to their personal lives.” But Californians do. Reeling from a decade of record-shattering drought, heat waves, and wildfires, people in the Golden State overwhelmingly tell Public Policy Institute of California pollsters that the effects of global warming have already begun. Indeed, Swain confirms, researchers can now link climate change with some of today’s extreme events beyond a reasonable doubt. “Climate change is a slow process, it kind of sneaks up on you, but we’re at the...
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23
Mar

Sub-Standard Snow

At a glance, the recent winter storms and inches of snow in the Sierra seem like a reassuring sign: more snow means more snow melt, which means more water moving through our freshwater systems during dry summer months. But it turns out that there are different types of snow with differing levels of moisture locked up inside — and the latest Sierra snowfall appears to be holding less water than usual. This means the Bay’s streams and estuaries could have drier conditions ahead, despite this winter’s semi-regular storms. Typically, snow that falls along the Sierra has a high moisture content because of the mountain range’s proximity to the Pacific Ocean, says Dan McEvoy, a regional climatologist with the Western Regional...
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23
Mar

Sediment Paparazzi

As the Estuary faces drowning marshes due to rising seas, people want to see action – acres saved, walls built, marsh mice whisked to safety after crawling to the tip of the tallest gumplant. In terms of action, “sediment monitoring” doesn’t come immediately to mind. Monitoring is something you do after all the action is over, isn’t it? And as for “sediment,” well what’s all the fuss over some dirt and mud? In fact, there is quite a fuss. The Bay region has a sediment management strategy and a sediment monitoring and modeling strategy, and later this month it will have a new sediment supply and demand analysis. Indeed, six different workgroups of Bay scientists, managers, and regulators are now...
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01
Mar

North America’s largest and most ancient freshwater fish species, white sturgeon, hang out in some kinds of Estuary waterways more than others, scientists find.

 Researchers with the U.S. Geological Survey found that adult and sub-adult white sturgeon occupy deep open-water channels and shallow open-water shoals in equal measure, but don’t use shallow wetland channels. As a group, white sturgeon are characterized as amphidromous, meaning they regularly migrate between freshwater and the sea, in both directions, but not for the purpose of breeding. According to the study, which appears in the December 2020 issue of San Francisco Estuary and Watershed Science, adults in the local population use coastal habitats to some degree, but typically remain in the Estuary and lower Sacramento and San Joaquin rivers. There they congregate in deep areas with fine-sediment substrate, and are thought to move into shallow subtidal habitats to feed...
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01
Mar

Filling significant recently identified gaps in monitoring spring-run Chinook is critical to protecting these threatened Central Valley salmon.

“There’s no way we can manage them for recovery if we don’t understand the biological processes that govern their dynamics through time and space,” says UC Santa Cruz/NOAA salmon expert Flora Cordoleani, lead author of a study reported in the December 2020 issue of San Francisco Estuary and Watershed Science. Cordoleani and colleagues identified the monitoring gaps while building a model of the spring-run Chinook life cycle. The model accounts for three self-sustaining populations of these at-risk fish, assessing survival of key life stages (eggs, fry, smolts and adults) as well as in key habitats (natal creeks, the Sacramento River, floodplains in the Sutter and Yolo bypasses, the Sacramento-San Joaquin Delta, and San Francisco Bay). “It’s a complex model, and...
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12
Nov

Science-in-Short ~ Aquatic Weeds Podcast

Wall-to-Wall Sampling of the Delta’s Aquatic Weeds Via Remote Sensing, an interview with Shruti Khanna.  In this episode of the podcast, Estuary News reporter Daniel McGlynn talks to Dr. Shruti Khanna, a senior environmental scientist at the California Department of Fish and Wildlife. Their conversation focuses on Khanna’s use of remote sensing technology to study the Sacramento-San Joaquin Delta. Specifically, Khanna analyzes and processes remote sensing data, or high- resolution images collected by sensors mounted on aircraft, to study invasive plant species growing in Delta waterways. Researchers also use remote sensing to study the Delta’s water quality, fish populations, and overall change. While remote sensing will never replace on-the-ground research, the massive data set produced by collecting large-scale images over...
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28
Sep

Science in Short ~ Fish Podcast

David Ayers: How Fish Interact with Wetlands Topography  In this podcast, Estuary News reporter Alastair Bland and UC Davis PhD student and fish researcher David Ayers discuss the Sacramento-San Joaquin Delta, its fish, its marshlands, its flows, and its future. Ayers explains the focus of his research, which seeks to reveal how underwater topography in the wetlands fringing the estuary affects interactions between predators and small fish. While restoration projects often focus on adding more water to this ecosystem and encouraging that water to overflow the river’s banks, Ayers says small fish need more than just water and wetlands to survive. Variation in habitat features, such as the width and depth of wetland channels that wind through these ecosystems, create a...
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22
Sep

A Fragile Fleet

Watching Bay-Delta science unfold, we take for granted the little armada that keeps it all going. Nobody has a firm count, but it appears there are about 100 vessels supporting research in the Estuary. They range from a few large craft that can work outside the Golden Gate to little “trailerable” skiffs and Adirondack rowboats that ply Delta shallows. Like many of the systems that quietly sustain our society, this one is showing signs of strain.
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22
Sep

Retrofitted Houseboat IDs Fish in the Shallows

On a hazy Delta morning at Isleton’s B & W Resort, more than a dozen trucks are already neatly arrayed in the double-long parking spaces with empty trailers facing the boat launch: evidence of fishers and boaters getting an early start on their Labor Day weekend. Randy Mager, sporting a flannel shirt and worn baseball cap, radiates earnest enthusiasm, which for a 20-year state government veteran is as refreshing and rare as a Delta smelt. “I am more excited about this than I have been about pretty much anything else in my career,” says Mager, a senior environmental scientist with California’s Department of Water Resources (DWR). Randy Mager. Photo: Isaac Pearlman The subject of his palpable excitement lays in the...
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13
Sep

By looking solely at the results of a single annual fish-counting survey, Californians may be seeing an incomplete reflection of Bay-Delta fish population trends.

A team of scientists analyzed 14 survey programs carried out by state and federal agencies, as well as UC Davis, and concluded that employing such a diverse variety of long-term surveys is essential for accurately tracking and assessing the overall health of San Francisco Estuary’s ecosystem and its resident fishes. The research is described in the June issue of San Francisco Estuary and Watershed Science. Lead author Dylan Stompe, of UC Davis, explains that the research arose from concerns that too many people – reporters included – have relied on the results of one annual survey, the California Department of Fish and Wildlife’s Fall Midwater Trawl, to make sweeping conclusions about the health and abundance of several fish species. The...
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05
Aug

A team of scientists is close to chasing down every last thing that happens to nitrogen in wastewater as it passes through the soils and plants of a horizontal levee.

Not only is 97% of the nitrogen removed, but also trace pharmaceuticals. “You just have to focus on where the water is going,” says environmental engineer Aidan Cecchetti, referring to the UC Berkeley-Stanford-ReNUWIt team’s experimentation with three components of flow through the levee system—under the surface, over the surface, or into the air (through evapotranspiration). “In the wastewater pumped to the subsurface, you see full removal of every contaminant except phosphorous.” What’s most astonishing is how much of the work occurs in that subsurface drainage through the first 10% of levee slope. What happened further along the slope mattered less, the team found; plants only absorbed 8-12% of the nitrogen, with willows being the highest performing species. “Predicting performance is...
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06
Jul

Surface water diversions in California’s Central Valley can be estimated based on readily available climate data, say researchers—a boon to efforts to track groundwater use.

Valley groundwater pumping is calculated as the total water demand minus surface water deliveries. However, today’s water model relies on individually reported diversions across the entire valley, and compiling all these data is a slow process; by the time the numbers are crunched, assessments of groundwater use are already outdated. “It can take years,” says Jordan Goodrich of University of Waikato in New Zealand. “It’s one of the biggest problems we face in tracking the Central Valley water budget.” Overdrafting groundwater can cause subsidence, permanently reducing the storage capacity of aquifers as well as jeopardizing above-ground infrastructure that delivers water and controls flooding. In the March 2020 issue of San Francisco Estuary and Watershed Science, Goodrich and colleagues at Scripps...
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18
Jun

New Eyes on Floods and Fire

Flames have become the unofficial face of climate change for Sonoma County, in the wake of the catastrophic Tubbs and Kincade fires that tore through the northern parts of the county in 2017 and 2019. Together the two fires burned more than 114,000 acres, roughly a tenth of the county, claimed 22 lives, and destroyed almost 5,000 homes. However, increased frequency and severity of wildfire is only one of the many ways that climate change is poised to affect life in Sonoma County. “The fires got us all out of our silos,” says Lisa Micheli...
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