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

sunset delta climate map

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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pesticide resistance delta map

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

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

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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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...
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Fixing a Dysfunctional Marsh on Sonoma Creek

Restoration projects, like species, evolve. The Sonoma Creek Enhancement Project, originally about mosquito control, has shown itself to be a boon to special-status tidal marsh wildlife as well. More than a decade of adaptive management actions made that happen.  The existing marsh, formed rapidly beginning in the 1960s by deposited sediment, lacked the dendritic channels of a mature marsh. High tides brought in water that pooled in a central basin and didn’t drain out, providing breeding habitat for mosquitos. The...
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A new project should dramatically improve conditions for endangered steelhead trout in the lower reaches of Alameda Creek.

The project is part of a long-term effort to restore steelhead to Alameda Creek. Last year, for the first time in decades, the San Francisco Public Utilities Commission began releasing water from a newly retrofitted dam, effectively reviving an important tributary stream. Also in 2019, the Alameda County Flood Control District began construction of a key fish ladder at the BART line crossing that will allow adult steelhead to access the river’s headwaters. The new fish passage enhancement plan focuses...
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Urchinomics

By Alastair Bland As purple urchins have multiplied, kelp forests, already stressed by unusually warm water, have collapsed. Norwegian company Urchinomics proposes to capture the overpopulated urchins, fatten them up in circulating seawater tanks, and sell them to restaurants—hopefully in volumes sufficient to dent the urchin armies and allow a kelp comeback. Greater Farallones National Marine Sanctuary press liaison MaryJane Schramm says combatting the urchin takeover “goes directly to our mandate to maintain or restore ecosystem balance.” Citizen science, she...
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Rebooting the Klamath

By Lisa Owens Viani “There are bounds on this system and if you mismanage it, you can kill off what was once the third-largest salmon run on the entire West Coast,” says Amy Cordalis, general counsel for the Yurok Tribe. In 2002, more than 70,000 adult salmon died on the Klamath River when U.S. Bureau of Reclamation diversions caused water temperatures to spike, which led to the spread of diseases that wiped out the fish. In February, the Klamath River...
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Dam Tweaks Yield Results

By Alastair Bland “After one year of flows, we’re seeing lots of rainbow trout,” says Brian Sak of the San Francisco Public Utilities Commission (SFPUC). For the first time ever, cold water is flowing steadily through Calaveras Dam in southern Alameda County, and into the creek canyon below. The return of rainbow trout to Calaveras Creek marks a milestone in an ongoing, multi-agency restoration of Alameda Creek, which drains more than 600 square miles of the East Bay. Since the...
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Dennis McEwan finished work on the 430-acre Yolo Flyway Farms Tidal Habitat Restoration Project in September 2018. A month later, he retired.

The timing was no accident; he’d delayed his departure from the California Department of Water Resources (DWR) to see the project through after helping to launch it ten years earlier. But even from the very beginning of his career, McEwan had been committed to doing all he could for declining species in and around the Delta. That “calling,” as he put it, began with 25 years at the California Department of Fish and Game (now Fish and Wildlife) supporting Pacific...
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After nearly 30 years in refuge management on public lands, Anne Morkill is leaving government, but not wildlife, behind.

Following her February 2020 retirement from managing the San Francisco Bay National Wildlife Refuge Complex, which she led for nearly a decade, Morkill is taking the helm at the Laguna de Santa Rosa Foundation, a nonprofit that stewards one of the largest freshwater wetlands complexes on the northern California coast. Morkill believes that San Francisco Bay provides unusual potential for restoring habitat for wildlife in a highly urban environment. “That’s what makes it so special,” she says, citing the Bay...
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While the acreage of wetland restoration projects is growing throughout the Delta, scientists are still working to understand how best to help these areas become fully functioning, complex habitat as quickly and successfully as possible.

A study published in September’s San Francisco Estuary and Watershed Science shed light on some essential questions about what triggers seed generation in wetland habitat. “Wetland restoration practices can be enhanced by a solid understanding of basic plant life history and species ecology,” says co-author Taylor Sloey of Yale-NUS College in Singapore. The researchers looked at three questions: what seeds are present in the seed bank (the viable seeds that accumulate naturally in the soil), and how exposure to cold...
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SOE Conference Banner Egret

Good Policy, More Tests for Living Shores

By Ariel Rubissow Okamoto While more sea walls may soon be necessary to adapt to rising seas, softer, greener, nature-based shorelines will also be important buffers for our cities and waterfronts. Wetlands, oyster reefs, eelgrass beds, and other natural features of shores and shallows figure largely in a number of ambitious, multi-partner restoration projects over the last decade. To date, more than 10 such projects have been or are being restored around the Bay, encompassing more than 200 acres of...
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Flows and Ecosystem Function Dominate Delta Plan Amendment

With the Delta lagging behind the Bay on four of the State of the Estuary Report’s five indicators, the last long-range plan for restoring its ecological health abandoned, and the threats from climate change becoming ever more alarming, the need for a new regulatory vision for the region may never have been greater. A pending amendment to the Delta Plan, shared by Ron Melcer at the State of the Estuary Conference as part of a policy update session, is meant...
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Clout and Cool Science Push Land-River Connection

By Robin Meadows Statewide, 13,000 miles of levees disconnect our rivers from their floodplains, which once served as nurseries for young salmon migrating to the ocean. California Natural Resources Secretary Wade Crowfoot wants to help restore this connection. “It’s one of the most exciting parts of my job,” he said in an interview, his face lighting up in a wide smile. “It’s a win-win-win―it’s a way we can reconnect water with land, create habitat, and provide flood protection.” Before all...
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Just Shy of Splendor in the Grass

By Jacoba Charles Tobias Rohmer and Ben Chen’s careful work in Hayward’s Cogswell Marsh represents one small moment in the massive, nearly 20-year-old Invasive Spartina Project. To date an initial total of 805 acres of non-native cordgrass, spread across 70,000 acres of the San Francisco Bay’s marshlands, has been reduced to less than 40 net acres. Treatment of the southern section of Cogswell marsh was halted in 2011, however, due to concerns about Ridgway’s rails who’d made homes in the...
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A small but mighty wetlands project on the San Rafael waterfront is moving forward thanks to a $1 million planning and design grant from the San Francisco Bay Restoration Authority.

Restoration of the heavily eroded 20-acre Tiscornia Marsh at the mouth of the San Rafael Canal will use dredged sediment to create new habitat for the endangered Ridgeway’s rail and salt marsh harvest mouse, migratory shorebirds, and other marsh species. Meanwhile, improvement of an adjacent levee will enhance public access along a levee-top section of the Bay Trail and, perhaps most critically, provide flood protection for the nearby Canal District, a dense, low-income community that’s home to many Latino immigrants...
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Super-Shore: A Multi-Habitat Experiment at Giant Marsh

Interview anyone of any stripe about the Giant Marsh living shorelines project and the same two words will be in every other sentence: high tide. Each construction step of this California Coastal Conservancy-led effort to build new native oyster reefs interspersed with eelgrass off the Contra Costa County shore must consider the timing of tides. High enough to float a barge or Boston whaler into the shallows, do a day’s work, and get back out again on the next cycle....
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Sandhill crane

Wildlife and Way of Life in the North Delta?

Californians ask a lot of the Sacramento-San Joaquin River Delta, where the state’s longest rivers meet and deliver snowmelt from the mountains. Water suppliers want to reconfigure the Delta’s plumbing via the ever-contentious Water Fix project, which Governor Gavin Newsom just sent back to the drawing board. State wildlife officials want to boost restoration in the region, and the 2019 Delta Conservation Framework outlines their latest plan. And people in the Delta want to live and farm there as they...
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