A grassroots effort to move migrating newts across a Marin County road has drawn to a close, but organizers hope it leads to a more permanent solution.

Native Species



16
Apr

A grassroots effort to move migrating newts across a Marin County road has drawn to a close, but organizers hope it leads to a more permanent solution.

For roughly half a mile, the two-lane road in a hilly rural area west of Petaluma travels alongside a large, natural body of water called Laguna Lake. On the other side is an oak woodland: the perfect place for California and rough-skinned newts, which spend the dry season in moist terrestrial habitat under leaf litter and wood debris or inside animal burrows. After seeing a number of native newts flattened along the road on rainy winter evenings, a small group of neighbors led by rancher Sally Gale formed the Chileno Valley Newt Brigade. Gale trained some 50 volunteers to monitor the road and physically transport newts across it on a nearly nightly basis throughout the winter migration. She also obtained...
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19
Mar

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 adds, may be an important part of implementing any action plan, “since eradication or control efforts are likely to be ongoing and work-intensive.”
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19
Mar

Kinky Fish Spines Linked to Selenium

Scientists with the U.S. Geological Survey and the National Oceanic and Atmospheric Administration are using new tools to track selenium, with the Sacramento splittail, a California-endemic fish, as an indicator species. In some sampled splittail, selenium levels exceeded the proposed EPA protective criteria for fish ovaries.
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19
Mar

Tracking Curlews Cross-Country

This winter, Jay Carlisle, director of the Intermountain Bird Observatory, teaming with Nils Warnock of Audubon Canyon Ranch and netting expert David Newstead of Coastal Bend Bays and Estuaries Program, caught two long-billed curlews and outfitted them with transmitters. Those birds may reveal where the wintering curlews on the California coast and Bayshore are coming from.“It’s such a habitat generalist that adapts well to humans,” Carlisle notes...
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19
Mar

Where have all the Herring Gone?

Pete has fished San Francisco Bay for nearly all of his 60 years. A lifelong San Francisco resident who keeps his last name to himself, he recalls herring runs in the 1970s the likes of which rarely, if ever, occur anymore. “I remember herring spawns that went from Oyster Point all the way to the Golden Gate Bridge,” says Pete, a former commercial fisherman, referring to the point near Brisbane. He also remembers massive spawns that stretched contiguously from the Tiburon peninsula out the Golden Gate to Point Bonita. Today, the fish still return. Each year between December and March, schools of Pacific herring, Clupea pallasii, lay and fertilize their eggs in the Bay’s shallow waters. When the fish gather...
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19
Mar

Network Listens for Passing Salmon

It’s a cold morning in early February, and Chris Vallee of the U.S. Geological Survey is motoring upriver along Steamboat Slough. Vallee and his team are here to maintain an array of hydrophones used to track migrating native fish. The work is part of a multi-agency effort to provide more timely and detailed information about the movements of salmon, steelhead, and sturgeon in the Central Valley.
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05
Mar

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 salmon and steelhead trout—including protecting valuable freshwater habitat upstream of the Delta and helping to get the coho salmon listed under the California Endangered Species Act. In 2007, McEwan jumped to DWR and was soon leading an effort to restore...
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05
Mar

A career spent monitoring imperiled fish has given Randy Baxter a strong sense of the vulnerability of aquatic ecosystems.

“We’ve overtaxed the system,” he says. Baxter officially retired from the California Department of Fish and Wildlife last August, but still works two or three days a week as a “reemployed annuitant”—a big change from supervising a staff of 14 studying the threatened longfin smelt and other native fish. The reduced schedule gives him more time to fish, in California and on British Columbia’s Skeena River, and tend his orchids and carnivorous plants. Chicago-born Baxter grew up in Pacifica with San Pedro Creek in his back yard; watching fish from the creek bank sparked a lifelong interest that led him to a bachelor’s degree from Humboldt State University’s fisheries program and a master’s thesis on salmon spawning behavior. An early...
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05
Mar

Bob Fujimura spent his entire career with the California Department of Fish and Wildlife.

Bob Fujimura spent his entire career with the California Department of Fish and Wildlife. From 1987 until his retirement in late 2018, Fujimura served in a variety of roles at the department—but he is likely best known for heading up its long-term monitoring of native fishes in the Bay and Delta. Beginning in the mid-2000s, he oversaw annual smelt surveys with far-reaching implications for management and conservation, including the Spring Kodiak Trawl, which determines the relative abundance and distribution of spawning Delta smelt; the Smelt Larva Survey, which provides near real-time distribution data for longfin smelt larvae; and the 20mm Survey, which tracks post-larval juvenile Delta smelt throughout their historical spring range. “My goal was to provide good science throughout...
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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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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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05
Dec

Speakers discuss issues facing Estuary wildlife and their wetland habitats, as well as drones and other new tools that will help future management.

Fish and Wildlife Check-up State of the Estuary Conference presentations featuring decades of data on fish, ducks, seabirds, and cetaceans revealed both hopeful and alarming trends. “The loss of federal funding for the midwinter waterfowl survey, usually conducted using small aircraft, has researchers looking at drone-based alternatives,” said waterfowl biologist Susan De La Cruz of the US Geological Survey. The overall community condition of the Estuary’s fish (abundance, distribution, diversity, proportion of native to non-native species) has declined, reported the National Resources Defense Council’s Christina Swanson, citing the 2019 State of the Estuary Update, Bay Study and other surveys. The breeding success of California least terns and Brandt’s cormorants reflects the status of the forage fish they feed on, according...
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19
Sep

Scarce Shark Tough to Tag

Basking sharks were once so abundant along the California coast that a thrill-seeking trophy hunter reportedly harpooned a half-dozen in under three hours in Monterey Bay. That was in 1947. Today, the big fish are so rare that it’s taken a team of scientists between San Diego and Santa Cruz eight years to put tracking tags into just six animals. Their numbers are so low, in fact, that researchers, working with tiny sample sizes, can scarcely study them at all or draw firm conclusions about population trends, threats to their survival, typical behavior, or how global warming may affect them. There is even concern that the sharks—filter feeders that may grow to 40 feet, the size of a small whale—are...
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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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19
Sep

Drones Pilot Vegetation Mapping

By Michael Hunter Adamson In the world of conservation, as attested to by multiple speakers at a late summer UC Davis event, drones, or UAVs (unmanned aerial vehicles) may be the vehicle of choice for mapping the future of invasive plant management in the Delta. The California Department of Water Resources began using UAVs in earnest after the Oroville dam failure in the winter of 2017, when drones offered visuals no one could get near on the ground. The Blacklock Ranch, a leveed island in Suisun Marsh, offers a more current example of how drones are now being employed at restoration sites. “We are using our UAVs and multispectral [red, blue, green, and infrared spectrums, for example] capabilities to map...
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19
Sep

Paddlers Monitor Plovers

By Ashleigh Papp “It sounds fun and glamorous to kayak to work, but it’s not always the case,” says Ben Pearl, plover program director for the San Francisco Bay Bird Observatory. Pearl spends six months of the year in the field researching predator threats, habitat status, and breeding behavior of the local snowy plover population. “All of this habitat used to be tidal marsh and was converted to salt ponds, so the ground is sometimes soft and nearly impossible to walk through,” says Pearl. “At some breeding sites, a kayak is almost always required to reach the nests.” Protecting these areas for plovers and other species requires ongoing work, but the habitat improvements are worth the effort, even if the...
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08
Aug

Two long-scarce freshwater mammal species are staging a comeback in Bay Area waterways.

The California Department of Fish and Wildlife (CDFW) recently updated its distribution map for the state’s river otters, reflecting sightings by citizen-scientist “otter-spotters.” River Otter Ecology Project director Megan Isadore says the map fills in major gaps in the North Bay and East Bay, increasing otters’ documented range by 4,100 square miles. “It’s interesting to find how well they’re doing in very populated cities,” she says. Absent from the Bay Area for decades, river otters were observed near Tomales in 1989 and sightings have proliferated since then, possibly due to cleaner waterways. In addition to “Sutro Sam,” who frequented San Francisco’s Sutro Baths, they’ve been reported in Walnut Creek, Petaluma, and even at the Golden Gate Fields racetrack on the...
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08
Aug

Coyote Valley, an important wildlife corridor connecting the Santa Cruz and Diablo Mountain ranges, would receive new protections under state legislation introduced in April.

AB 948 would create a new Coyote Valley Conservation Program, to be administered by the Santa Clara Open Space Authority. The bill would expand the existing protected area from 7,400 acres to 17,000 acres, and boost new efforts to preserve its resources. Coyote Valley, which drains the ecologically rich upper watershed of Coyote Creek, has long faced development threats as surrounding South Bay communities expand. The area provides critical habitat for critters large and small, which use the valley—especially its waterways—to move between more remote areas in the two mountain ranges. The Valley also includes 2,500 acres of floodplains and sits atop half of Silicon Valley’s undeveloped aquifer recharge areas, making its protection even more important. “Coyote Valley’s very shallow...
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08
Aug

Invasive clams and freshwater exports from the Delta have created dramatic and unsustainable changes in the San Francisco Estuary’s foodweb over the past 50 years.

 A study by UC Davis researchers found a 97% decline in phytoplankton, the microscopic foundation of the food chain. “Understanding the causes for the decline in the pelagic [water column] community is essential so that efficient solutions can be implemented,” says Bruce Hammock, a research scientist at the UC Davis School of Veterinary Medicine’s Aquatic Health Program. The invasive clams (Potamocorbula amurensis), originally from Asia, have been over-consuming phytoplankton and zooplankton for more than 30 years, and have long been understood to account for part of the fish population’s decline; the new study investigated the additional effects of exports. Beginning in the 1940s, fresh water from the Delta has been pumped by the federal Central Valley Project and the State...
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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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