Manmade features in the Delta, including riprap-armored banks, water diversion pipes, pilings, and woody debris, may be sending juvenile native fishes into the jaws of finned invaders.

Restoration



22
Jan

Manmade features in the Delta, including riprap-armored banks, water diversion pipes, pilings, and woody debris, may be sending juvenile native fishes into the jaws of finned invaders.

“We know from a decade of doing survival studies that migrating juvenile salmon are dropping out of the system pretty much everywhere in the Delta,” says UC Santa Cruz fisheries biologist Brendan Lehman. “Physical habitat features are potentially aggregating predators and prey in ways detrimental to salmon smolts and steelhead.” The scientists report in the December 2019 San Francisco Estuary and Watershed Science that artificial light and submerged aquatic vegetation pose the most severe and widespread risks to native fishes. Plants like Brazilian waterweed form dense underwater mats across vast reaches of the Delta. These mats have nurtured a rise in predatory bass populations and force prey fish into exposed channel centers. The artificial lighting pervasive along docks and buildings...
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22
Jan

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 and flood affects their germination. The study was based on seed bank samples taken from wetlands on the Delta’s Liberty Island. Though the island was drained and farmed throughout most of the 20th century, it has been naturally recolonized by...
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22
Jan

An emergency barrier installed to protect the state’s water supply from saltwater intrusion during the recent record-setting drought had little effect on the ecosystem.

In spring 2015 the California Department of Water Resources dropped 150,000 tons of rock into False River in the Central Delta to halt encroaching tides that had little freshwater to hold them back. A few months later, it was clear the barrier worked, as salinity rose on one side and fell on the other. But what were the effects on local plants and animals? Through six overlapping yet distinct projects funded by the state Delta Science Program and NASA, and described in the September 2019 issue of San Francisco Estuary and Watershed Science, researchers studied impacts on water quality and movement, zooplankton and phytoplankton, submerged aquatic vegetation, nutrients, and two species of clam. What they found, says Wim Kimmerer of...
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SOE Conference Banner Egret
05
Dec

Good Policy, More Tests for Living Shores

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 shoreline and nearshore areas. “We need larger living shoreline projects and we need them fast," said biologist Katharyn Boyer...
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05
Dec

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 to provide that vision and the strategies to achieve it. The amendment — to Chapter Four of the Delta Plan, which focuses on the Delta ecosystem — was developed in response to the state’s pivot away from the 2013 Bay-Delta...
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05
Dec

Not So Picky Marsh Mouse

The endangered salt marsh harvest mouse (informally “Salty”) is a poster child for tidal marsh restoration in San Francisco Bay. But recent research, presented by University of California at Davis postdoc Katie Smith in a State of the Estuary conference session on tidal wetlands, suggests we’ve misinterpreted what the mouse needs. “It’s been managed as a habitat specialist,” she said, based on assumptions that it requires tidal wetlands and a diet of pickleweed. However, hours of mouse-tracking around the Bay show that it also thrives in managed wetlands and eats a variety of plants, including non-native species. Although restoration projects have created high-tide refuges for the mice, Smith’s preliminary data suggest other rodent species exclude them from those sites. That...
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19
Sep

Clout and Cool Science Push Land-River Connection

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 a win-win-win―it’s a way we can reconnect water with land, create habitat, and provide flood protection.”
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19
Sep

Just Shy of Splendor in the Grass

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. 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 invader. “Complete eradication has been and still is our goal,” says Marilyn Latta...
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08
Aug

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 —and also among the Bay Area’s most vulnerable to sea-level rise. “Our project will help with that, because that section of the levee is uneven and low,” says Barbara Salzman, executive director of Marin Audubon, which owns the marsh parcel....
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14
Jun

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. Three feet at least of draft – the amount of boat below the surface which varies depending on its weight — and preferably not in the middle of the night. On April 18, as the contractor Triton Marine placed 180...
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Sandhill crane
14
Jun

Wildlife and Way of Life in the North Delta?

There may not be a way to give everyone what they want from the Delta. But there are ways to restore ecosystems while preserving local communities. This is true even along State Route 160, which traverses the most populated and most intensively farmed part of the region. The highway follows the Sacramento River into the Delta, twisting and turning around leveed islands between Freeport and Rio Vista. This is the North Delta and it's a spectacular drive...
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13
May

Jessica Fain got a crash course in resilience planning when Hurricane Sandy hit the East Coast in 2012.

Fain, Planning Director for the Bay Conservation and Development Commission (BCDC) since October, was part of a three-person office in the Waterfront and Open Space Division of New York’s Department of City Planning. “We were doing a small study on adaptation options,” she recalls. “In the middle of that, Sandy hit. Suddenly all eyes were on us.” Fain brings that background to a setting unlike New York in many ways. Instead of five boroughs, for example, she’s dealing with a multiplicity of counties, cities, and special districts. But the Bay Area presents new opportunities: “There’s more space for green infrastructure, wetlands, adaptive solutions at a large scale. New York is so constrained; it’s built out to the edge.” She’s involved...
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13
May

Sandra Scoggin has the qualities the San Francisco Bay Joint Venture needs in a leader at what she calls a ‘pivot point’ for the partnership.

In the early days, when the wetland protection and restoration landscape was less complex, the JV “could be everywhere and do everything.” Now it needs to be more strategic. “I’m a listener, a synthesizer, and I’m pretty good at herding diverse interests toward shared goals,” says Scoggin, who is taking over the 20-year-old wildlife habitat venture after 16 years in second seat. “The JV is built on deep and lasting relationships,” she says, both awe and pride in her voice. Scoggin grew up in Los Angeles. After early work studying songbird nesting, she developed a soft spot for the Swainson’s thrush: “It’s like a ghost of the riparian forest, with an ethereal, beautiful song that comes out of nowhere.” In...
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06
May

Dave Halsing is in a race against sea level rise to restore the South Bay salt ponds.

 “The existential challenge is doing marsh restoration fast enough to get it into place and established before sea level rise really starts to kick in,” says Halsing, the new Executive Project Director for the massive, 15,000-acre South Bay Salt Pond Restoration Project. The thoughtful and reflective restoration manager is seizing the reins from previous director John Bourgeois to lead the 50-year, $1 billion effort that is the largest wetland restoration project on the West Coast. “I had to take a shot at what was truly a unique, once-in-a-lifetime opportunity,” Halsing says of his new position. “Connecting with so many different agencies, communities, and stakeholder groups is a fascinating and rewarding opportunity. It touches on so many aspects of the natural...
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21
Mar

Purse Opens for PCA Projects

Marsh restoration, Bay and Ridge Trail extensions, and urban park upgrades are among the types of projects eligible to receive funding through the 2019 Bay Area Priority Conservation Area (PCA) One Bay Area Grant Program. By March, aided by new mapping tools that can pinpoint regional landscape characteristics and needs, more than 36 cities, counties, agencies and non-profits had submitted letters of interest to the program, outlining a variety of projects that benefit one or more of the Bay Area’s 165 PCAs (see map opposite). Altogether, the grant requests totaled more than $19 million. Some of these projects may help vulnerable shoreline areas defend against sea level rise; others may make urban hardscapes more porous under atmospheric river downpours; still...
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20
Mar

Attention to Outcomes

The new Wetland Regional Monitoring Program, funded through an EPA Region 9 Wetlands Program Development Grant and managed by the San Francisco Estuary Partnership, aims to revolutionize the way that data is collected and shared about one of the Bay Area’s most fragile yet resilient ecosystems -- wetlands. “Monitoring data sits on shelves,” says Heidi Nutters...
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20
Mar

Putah Creek Pipeline for Salmon

“The dream is to reestablish a natural run of salmon in Putah Creek,” says UC Davis professor emeritus Peter Moyle. In 1972 Putah creek was a trickle of water between heavy machinery mining gravel for the campus roads. Moyle and others urged the university to cease mining and by the end of the decade the administration had designated a riparian reserve along the creek on campus. Since then there’s been an incredible increase in salmon....
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20
Mar

SOS for Finicky Native

In 2016, restoration managers with The Nature Conservancy discovered that western sycamores planted along the Sacramento River had hybridized with the non-native London plane tree. The native sycamore is “kind of a messy tree,” says project manager Ryan Luster. “The branches break off and create cavities that wildlife love to use.” Concerns about the tree’s status first arose in the 1990s...
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13
Feb

Haggles over the what, where, and when of Delta conservation got a reset this January with the state’s release of a new collaborative framework focused on opportunities, not species.

The California Department of Fish & Wildlife’s new Delta Conservation Framework tries to fill the vision vacuum left by former Governor Brown’s early pivot away from the 2013 Bay-Delta Conservation Plan, a plan that touched in some shape or way on 160,000 acres of the Delta. “It was too big and too unwieldy for people to manage, and there were too many questions about its effects, and how it would be implemented – particularly as it related to the Delta as a unique place,” says the agency’s Carl Wilcox. In 2016, with the help of the Delta Conservancy, CDFW held a series of workshops with landowners, agencies, biologists and others to define new conservation goals and strategies in light of...
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13
Dec

Greening Dickson’s Heights

Looking east from the levee-top trail, a silvery swath of bay is dotted with low islands. This is low tide at the nearly 1,000-acre Sears Point wetland restoration project on the western side of San Pablo Bay. “Without the mounds, you would just have a big area of open water,” says Julian Meisler with Sonoma Land Trust.
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