By

Lisa Owens Viani
About the author

Lisa Owens Viani is a freelance writer and editor specializing in environmental, science, land use, and design topics. She writes for several national magazines including Landscape Architecture Magazine, ICON and Architecture, and has written for Estuary for many years. She is the co-founder of the nonprofit Raptors Are The Solution, www.raptorsarethesolution.org, which educates people about the role of birds of prey in the ecosystem and how rodenticides in the food web are affecting them.

Articles by Lisa Owens Viani

24
May

Lisa Owens Viani

I’m proud of the reporting I did on oil spills in San Francisco Bay. During the Cosco Busan and Dubai Star spills, I experienced the damage firsthand while volunteering to rescue birds on the Bay shoreline; I later became involved in Estuary Partnership-sponsored legislation that would have required ships to double boom during refueling. I found writing about contaminants like selenium and flame retardants (to name just a few) fascinating and scary. I enjoyed writing about green stormwater treatment because at the time, California was lagging behind the Pacific Northwest and I hoped to inspire our readers and decision-makers to do more. I also liked writing about freeing up rivers for fish by taking down dams, and about restoring rivers...
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31
Aug

California will spend big bucks on beavers to try to boost their numbers and reap some of the benefits—including slowing wildfire—these ecosystem engineers can provide.

After years of advocacy by beaver “believers,” the state has allocated funding for a beaver restoration program. The $1.67 million in license plate funds for fiscal year 2022-23 and $1.44 million the following year represents a new way of thinking about beaver management in California, says Kate Lundquist, of the Occidental Arts & Ecology Center. “Until recently, the Fish and Game Code has focused on recreational and commercial beaver trapping and permitting the depredation of nuisance beaver,” she explains. “I am excited that the Governor, the Natural Resources Agency, and the California Department of Fish and Wildlife are recognizing beaver and process-based restoration as legitimate nature-based solutions that can restore our watersheds, recover listed species, and make our state more...
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17
Jun

Thinking Like Beaver to Aid Yellow Creek

Last fall, the Maidu Summit Consortium, a nonprofit composed of nine Mountain Maidu tribal member groups, installed 73 BDAs—beaver dam analogs—in Yellow Creek, a tributary to the North Fork Feather River and a state-listed heritage trout stream. Swift Water Design and U.S. Fish and Wildlife Service designed the structures, and Mountain Maidu tribal youth worked with Swift Water to build them. The idea behind the structures, which mimic beaver dams, is to slow erosion, catch sediment, and build up the river bottom to reverse the incised channel—without importing soil and other materials or emitting carbon from heavy, diesel-powered equipment. “Before this project, PG&E had done some pond and plug projects to restore the meadow,” says Trina Cunningham, executive director of...
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22
Sep

Covid Clues from Wastewater

As COVID-19 continues its unrelenting rampage, wastewater plant managers and university researchers are ramping up their efforts to monitor wastewater for SARS-CoV-2, the virus that causes the disease. Their goal is to give public health departments a powerful tool: an early warning system for new outbreaks in communities. In Yosemite Valley, for instance, wastewater testing revealed the presence of the virus in the community before swab testing of individuals showed a problem. “There’s a time delay before cases appear in a community and in the medical system,” says Katy Graham, a graduate student at Stanford University who is leading development of laboratory methods that will link trends and concentrations of the virus’ RNA (ribonucleic acid) in wastewater to the virus’...
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05
Aug

Great whales, the largest creatures in the sea, can help mitigate climate change by locking up carbon in their massive bodies and boosting phytoplankton with their waste products.

A preliminary study by researchers with the International Monetary Fund’s Institute for Capacity Development, the University of Notre Dame, and Duke University found that each great whale sequesters an average of 33 tons of CO2 over its lifetime, taking that carbon out of the atmosphere for centuries: when a whale dies and sinks to the sea floor, it takes that carbon with it, says Joe Roman, conservation biologist and author of Whale. (Compare that to a tree, which sequesters about 48 pounds of CO2 per year.) Whales act as nutrient pumps in the ocean as they dive and feed and then surface, nourishing phytoplankton growth with their waste products, which contain the iron and nitrogen the marine algae need to...
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16
Apr

Beaver dams may offer wildfire protection to western watersheds, in addition to providing better-known benefits such as groundwater recharge, wetland and habitat creation, and riparian restoration.

A new study by California State University Channel Islands professor Emily Fairfax analyzed satellite-derived vegetation indices of riparian areas and beaver dams mapped via Google Earth. At the same time, Fairfax analyzed data for large (over 30,000 acre) wildfires that had occurred between 2000 and 2018 in California, Wyoming, Colorado, Idaho, and Oregon, and compared the fate of beaver-dammed areas to areas without dams. Fairfax found that riparian corridors within 100 meters of beaver ponds were buffered from wildfires. “In all of them, the beaver ponds made it through the fire and stayed much greener. The beaver-dammed riparian zones were functioning differently,” says Fairfax. While the riparian areas without beaver dams eventually recovered on their own, she says, vegetation in...
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19
Mar

Rebooting the Klamath

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. In February, the Klamath River Renewal Corporation, including the Yurok and Karuk Tribes, filed to take over management of four hydroelectric dams in the upper watershed. “There’s never been a project that has considered removing four dams at the same time on the same river...
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19
Sep

Tire Melt in Salmon Stream?

On the morning of November 8, 2018, Allen Harthorn, a farmer who lives near the town of Paradise, watched a dark cloud of smoke forming in the east and began to worry about the safety of his home. He also began to worry about some other residents of the Butte Creek watershed—the largest run of naturally spawned spring Chinook in California.
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08
Aug

New shoreline strategies piloted in Puget Sound could help young fish in urbanized estuaries elsewhere.

When Seattle rebuilt its seawall in 2017, they hoped to make the hardened shoreline a little less daunting for the young salmon that hug it closely on their journey to the ocean. Project managers took a three-pronged approach. First, they added texture and complexity into the new concrete seawall to encourage invertebrates, food for the young fish, to settle in nooks and crannies and on horizontal “shelves” built into the wall. Mussels, ecosystem engineers, have settled on the shelves and attracted many other organisms. Next, they installed a habitat “mattress” in the seafloor in front of the wall. This horizontal structure of mesh-covered rocks lifts the seafloor, calms waves, and encourages the growth of kelp and invertebrates for the salmon....
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17
Jun

Needed Now: A Big Blue-Green Push

From rain gardens to green streets to permeable parking lots and pebble dunes, landscape architects and resource managers are working to soften up shorelines and sidewalks, all to sponge up and filter stormwater runoff before it reaches the Estuary. This article details projects in the South Bay Salt Pond Project’s Eden Landing, Hayward’s Turner Court, and the Delta’s Elk Grove, and along the East Bay’s San Pablo Avenue and San Jose’s Chynoweth Avenue.
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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
Nov

Incidental findings of a long-term study of brown bear predation on salmon have revealed a hidden link between the fish and forest health.

For 20 years, Tom Quinn, a professor in Aquatic and Fishery Sciences at the University of Washington, waded in southwestern Alaska’s Hansen Creek with his students, counting and measuring sockeye salmon carcasses in the stream. Quinn asked his students to toss the bodies on the north bank of the creek to avoid double counting; over the years, they tossed close to 295 tons of salmon onto the north bank. In 2016, Quinn and his colleagues and students took core samples from the white spruce growing on both sides of the creek. The samples revealed that over the course of the study the salmon-fertilized trees on the north bank had caught up in growth with the taller trees on the south...
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13
Nov

Floods and droughts can cause pools and riffles—and the bugs that live in them—to become more homogenous.

For years, scientists monitoring water quality in streams and rivers have collected mixed samples of aquatic invertebrates from riffles, pools, and transition zones. But UC Santa Barbara stream ecologist David Herbst and his colleagues recently finished a 15-year study of the benthic life in small streams of the central Sierra that examined pools and riffles separately. They found that during flood and drought events, these habitats and their inhabitants become more uniform. But while floods come and go, droughts can have longer-term effects on the biodiversity in the stream. “As stream flows go down, the riffles go dry first,” says Herbst. “The riffle habitat, the richest place in the stream, can be depleted during drought conditions. The habitat itself is...
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13
Aug

Nighttime lights on bridges shining into bays and rivers can attract and confuse fish as they migrate at night, leaving them vulnerable to predation.

“Well-lighted bridges and dams can create twilight conditions that predators love, especially other fish,” says Peter Moyle, professor emeritus at UC Davis. He recounts that at one point the Red Bluff Diversion Dam was lit up at night and pikeminnow took the opportunity to prey on juvenile salmon. “Opening up the gates helped because the pikeminnow were headed upstream to spawn so didn’t really want to be there, and the juvenile salmon could move past the dam quickly at night.” The Sundial Bridge in Redding is thought to have contributed to low numbers of fall-run Chinook salmon on the Sacramento River between 2011 and 2013. The Bay Institute’s Jonathan Rosenfield agrees that the problem from lights should be mitigated whenever...
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13
Aug

The latest casualty in America’s opioid epidemic is a small invertebrate that filters pollutants and feeds hungry shorebirds.

Biologists testing mussels in the waters around Seattle as part of the Puget Sound Mussel Monitoring Program found oxycodone in mussel tissue for the first time, along with antibiotics, antidepressants, chemotherapy drugs, and heart medications. “We have found evidence that these chemicals are in our nearshore marine waters and are being taken up by marine biota living there,” said Washington Department of Fish & Wildlife biologist Jennifer Lanksbury. She also tested juvenile Chinook salmon in Puget Sound estuaries and found similar results, with the fish being exposed to multiple human medications and other products. The mussels tested were not wild mussels but clean mussels the researchers had transplanted from an aquaculture farm on Whidbey Island to locations near the port...
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02
May

The country’s tiniest falcon—the stunning American kestrel—is declining throughout the United States, and California seems especially hard hit: Kestrel numbers during the Golden Gate Raptor Observatory’s annual autumn migration counts declined from nearly 800 in 1997 to just 300 in 2017.

“Kestrels in California have been on a long downward trend since 1950 at least,” says GGRO Director Allen Fish, citing several potential reasons for the decline, including predation by other raptors. Pesticides destroy important food sources for kestrels and also sometimes poison the birds themselves. Rodenticides and insecticides work their way up the food chain and cause secondary poisoning, as do heavy metals like selenium, mercury, and lead. Loss of nesting sites is another problem: kestrels are cavity nesters and rely on old woodpecker holes and tree hollows; they do not excavate their own cavities. Very old trees are becoming harder to find in managed forests, says Fish, and dying trees with potential nesting cavities are often treated as fire...
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13
Nov

A former Japanese-American-owned nursery/brownfield in Richmond is being transformed into a green infill development that includes affordable senior housing, a four-acre greenbelt with a daylighted creek, an urban forest, and easy connections to transit via the Richmond Central Greenway.

Tucked into a corner of the city next to the I-80 freeway and BART tracks, the “Miraflores” site was the heart of the Japanese-American nursery industry in the East Bay. From the early 1900s to 2006, three Japanese-American families operated a rose and carnation nursery there, one of about a dozen such nurseries in the Richmond-El Cerrito area, according to Bay Area historian Donna Graves. During World War II, the families were sent out of state to camps but returned to operate their nurseries after the war; the redevelopment will preserve some homes, water towers, and greenhouses to honor the families. In 2006, the Richmond Redevelopment Agency purchased the property and began cleaning up contaminants on the site, which included...
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11
Aug

Two Massachusetts restoration projects have recently returned close to 740 acres of commercial cranberry bogs to wetlands.

Like the Bay Area’s salt ponds, cranberry farming originally involved creating an artificial environment from a natural wetland through the installation of dams and weirs. The cranberries—a plant native to North America that naturally grows as a vine—were then trained to grow in mats on the water’s surface. A project on Tidmarsh Farms in Plymouth, Massachusetts included redirecting a natural stream that had been diverted into an agricultural canal back into its original channel and planting 6,000 Atlantic white cedars to “jumpstart” the native wetland restoration. The farm is approximately 10 feet above sea level, says Alex Hackman, Restoration Specialist with the Massachusetts Department of Fish & Game, so the tides aren’t yet connecting with the new wetlands. But as...
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21
Sep

Nutrient Nuances Modeled

San Francisco Bay is becoming less opaque as the sediments power-washed into the Estuary by miners so long ago gradually disperse. This lets sunlight penetrate deeper into the water, creating more favorable conditions for the kind of problematic algal blooms that can shut down crab fisheries and keep people and their pooches out of the water. Scientists have collaborated on some new computer models, however, that may help them predict where and when nutrients, like nitrogen and phosphate from discharges and runoff, may exacerbate the situation.
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13
Jun

An Eggfull of Estuary

Birds’ eggs don’t lie. Just as thinning eggshells once revealed how DDT was affecting peregrines and pelicans, the eggs themselves are now telling scientists how long-lived some contaminants are in the Estuary and where they are the most problematic.
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