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Topic: Invasive species

Overview April 24, 2014

Invasive species

Invasive species, also known as exotics, are plants, animals, insects, and aquatic species introduced into non-native habitats. Without natural predators or threats, these introduced species then multiply.

Often,invasive species travel to non-native areas by ship, either in ballast water released into harbors or attached to the sides of boats. From there, introduced species can then spread and significantly alter ecosystems and the natural food chain as they go. Another  example of non-native species introduction is the dumping of aquarium fish into waterways.

Invasive species also put water conveyance systems at risk. Water pumps and other infrastructure can potentially shut down due to large numbers of invasive species.

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Aquafornia news September 26, 2023 KUNC - Greeley, Colo

Officials are on alert after the rusty crawfish shows up near the Colorado River

Colorado Parks and Wildlife announced the discovery of an invasive crayfish species in Lake Granby. The rusty crayfish, named for reddish spots on its shell, hasn’t been seen in the state in over a decade. The agency is on high alert because of Lake Granby’s proximity to the Colorado River, and is now focused on stopping the crayfish from spreading further. … Walters said the invaders eat small fish, insects and fish eggs, which disrupts the aquatic food web. They can also eat plants on the bottom of the reservoir, which serve as critical habitat for fish spawning and food for native wildlife.

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Aquafornia news September 22, 2023 KTLA - Los Angeles

Invasive snail species discovered in Lake Tahoe is ‘impossible’ to eradicate, officials say 

The California Department of Fish and Wildlife announced the discovery of an invasive species in Lake Tahoe. According to a CDFW release, divers monitoring the lake for aquatic invasive species detected New Zealand Mud Snails (Potamopyrgus antipodarum) off Lake Tahoe’s South Shore. … They were believed to have been introduced to western rives through shipments of live sportfish, but subsequent spread is likely due to recreational activities, CDFW officials said.

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Aquafornia news September 19, 2023 KKCO - Grand Junction, CO

Colorado Parks and Wildlife finds invasive species in Upper Colorado River Basin

Colorado Parks and Wildlife found an invasive species in Lake Granby. Multiple rusty crayfish were found at Lake Granby during routine aquatic sampling on August 17th. According to CPW, rusty crayfish have been found west of the continental divide before, but this is the first time they have been found in the Upper Colorado River Basin. Crayfish are not native west of the Continental Divide. Lake Granby feeds into the Colorado River and having the invasive crayfish in there can pose a threat to the river’s ecosystem.

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Aquafornia news September 18, 2023 The Good Men Project

Reviving a famously polluted California lake

Jesus Campanero Jr. was a teenager when he noticed there was something in the water. He once found a rash all over his body after a swim in nearby Clear Lake, the largest freshwater lake in California. During summertime, an unbearable smell would waft through the air. Then, in 2017, came the headlines, after hundreds of fish washed up dead on the shore. “That’s when it really started to click in my head that there’s a real issue here,” says Campanero, now a tribal council member for the Robinson Rancheria Band of Pomo Indians of California, whose ancestors have called the lake home for thousands of years. The culprit? Harmful algal blooms (HABs). 

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Aquafornia news September 14, 2023 ABC7 - Los Angeles

NASA scientists use new tool to track harmful algal blooms across the world, including SoCal

It was the largest algal bloom on record and it took place in June off the California coast. The planktonic algae made the water look green while producing a toxin. Seals, sea lions and dolphins eat fish that have eaten these algae, therefore hundreds died as a result. … Using satellite data, Gierach and other scientists created new ways to study the changes in the ocean. … Satellites can even measure color and temperature changes. A lot of the increase in algal bloom is caused by what we dump into the ocean, runoff, fertilizer and climate change.

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Aquafornia news September 13, 2023 Capital Public Radio

Invasive mosquito species found in San Joaquin County

A mosquito breed known for carrying yellow fever and other diseases has been spotted in portions of the San Joaquin Valley. Last week, the San Joaquin County Mosquito and Vector Control District said high numbers of Aedes aegypti mosquitoes have shown up in traps around South Stockton, Manteca, Escalon and Ripon. The mosquitoes have also popped up in Butte and Glenn counties this summer. Like the majority of other mosquitoes that live here, Aedes aegypti are not native to the state. They’re also relatively new to California, having first shown up in traps in 2011, according to the state’s Department of Public Health.

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Aquafornia news September 13, 2023 Colorado Public Radio

Federal fish conservation programs have found success in Western Colorado, but they’re swimming upstream in Congress this year

A popular federal effort to protect threatened Western fish is in murky waters as stakeholders await Congressional action on reauthorization.  The Upper Colorado River Endangered Fish Recovery Program has for 30 years sought to restore four species that once thrived in the river: the razorback sucker, Colorado pikeminnow, bonytail and humpback chub. A sister effort, the San Juan River Basin Recovery Implementation Program, works to restore the same fish in the Four Corners region. The species are imperiled by human-wrought habitat disruption, like dams, and preyed upon and out-competed by introduced species like rainbow and brown trout.

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Aquafornia news September 12, 2023 Sierra Sun

The wrong kind of blooms: Climate change, invasive clams are fueling algae growth on Lake Tahoe

While out enjoying an afternoon on one of Lake Tahoe’s sandy beaches over the past few years, you might have noticed large mats of decomposing algae washing up or floating nearby. The lake’s famed blue waters are facing another threat while the battles of climate change and invasive species wage on — and it’s all very much connected.  Nearshore algae blooms are a burgeoning ecological threat to Tahoe. Not only do they impact the experience for beachgoers, but they also degrade water quality and, in some cases, pose a threat of toxicity.  Over the last 50 years, the rate of algal growth has increased sixfold, according to U.C. Davis Tahoe Environmental Research Center’s 2022 State of the Lake Report. 

Related articles: 

  • KRCR – Redding: Lewiston Lake’s surprise guest: Unwanted toxic algal mats
  • Fox 40 – Sacramento: Divers begin removing invasive aquatic plants from Emerald Bay
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Aquafornia news September 11, 2023 Arizona Public Radio

Grand Canyon gets funds to protect native species

Grand Canyon National Park will get more than a quarter-million dollars to remove invasive species and protect native species of fish in the Colorado River. The funds come from the Inflation Reduction Act and are part of a nationwide effort to restore natural habitats and address climate change impacts.  Lake Powell, a key Colorado River reservoir, dropped to historically low levels last year due to climate change and drought. This created viable breeding conditions and easier passage through Glen Canyon Dam for high-risk invasive species like smallmouth bass and green sunfish.

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Aquafornia news September 11, 2023 Courthouse News

EPA agrees to protect waterways from harmful ship discharges

The Environmental Protection Agency agreed Friday to finalize nationwide standards that will protect U.S. waterways from the harmful effects of discharges from ships. Under the agreement, the EPA must release its final standards on vessel discharges by Sept. 24, 2024. The standards are required by the Clean Water Act. The agreement is the end result of a lawsuit filed by the Center for Biological Diversity and Friends of the Earth this past February. In their complaint, the groups claimed that ballast water adversely affects waterways by spreading harmful zebra mussels, coral diseases and human pathogens. Both groups were represented by the Stanford Law Clinic.

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Aquafornia news September 8, 2023 Northern California Water Association

Blog: Biodiversity in the Sacramento Valley

Today is California Biodiversity Day, which marks the anniversary of the launch of California Biodiversity Initiative in 2018 and celebrates our amazing state, the exceptional biodiversity we have in the Sacramento Valley and throughout California, and the actions we can work on with our many partners to ensure biodiversity. In the Sacramento Valley, our goal is to promote functioning ecosystems and sustainable water supplies by preserving, sustaining, and promoting our communities and working agricultural landscapes that support ecosystem function and provide landscape-scale habitat benefits for fish, bird, and wildlife populations.

Related article: 

  • Maven’s Notebook: Blog - Understanding predators to better understand predation 
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Aquafornia news September 8, 2023 Tahoe Daily Tribune

Invasive plant barrier installed at Taylor, Tallac marsh areas; Public reminded to stay out of fenced areas

Agencies restoring the Taylor and Tallac marsh areas have completed the installation of bottom barriers to remove 17 acres of invasive plants as part of the comprehensive restoration of one of the last natural wetlands in the Lake Tahoe Basin, the USDA Forest Service Lake Tahoe Basin Management Unit and Tahoe Regional Planning Agency announced today. The collaborative project that began in December 2021 is one of the largest aquatic invasive species control projects ever undertaken in the Tahoe Basin. 

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Aquafornia news September 5, 2023 Los Angeles Times

West Nile virus is a growing threat this summer in California. Here’s why

West Nile virus infections are on the rise this year in California after a particularly wet winter led to more mosquito reproduction, according to health experts. The state had 55 human cases of the virus as of Aug. 25. Five of them were fatal, according to the California Mosquito-Borne Virus Surveillance and Response Program. That’s more than double the 24 cases that had occurred in 2022 by late August of that year. In total in 2022, there were 207 cases and 15 deaths. Among California’s latest infections, a woman in Orange tested positive for the West Nile virus  this week, becoming the first human case in Orange County this year, according to the county Health Care Agency. The Orange resident wasn’t experiencing any symptoms.

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Aquafornia news September 1, 2023 Las Vegas Review-Journal

To help endangered fish, Lake Mohave water levels to drop

Water levels at Lake Mohave are expected to drop about 10 feet in the coming weeks to improve habitat and spawning cycles for two endangered fish species native to the Colorado River system. The annual fall drawdown of the reservoir is part of an ongoing effort by the federal government to restore populations for the boneytail chub and razorback sucker, the National Park Service said in a news release. The surface of Lake Mohave will go from its current elevation of roughly 643 feet above sea level down to about 633 feet by mid-October. Water levels will start to tick back up starting in November and return to normal by mid-January.

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Aquafornia news September 1, 2023 KCRA - Sacramento

What to know about West Nile Virus as cases increase in Northern California

West Nile virus cases have been increasing in Northern California. The West Nile virus is the most common and serious vector-borne disease in the state. There were 29 new West Nile Virus cases in humans last week, bringing the total for the year to 55 cases. Those cases have been reported in Glenn, Lake, Butte, Yolo, El Dorado, Sacramento, San Joaquin, Santa Clara, Stanislaus, Merced, Madera, Kings, Tulare, Kern, Los Angeles, San Bernardino and Riverside counties. On Wednesday, another human case in Roseville became the first this summer in Placer County. Five people with the virus have died, including one person in Sacramento County and another person in Yolo County.

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Aquafornia news August 30, 2023 The Hill

‘Valley fever’ fungus surging northward in California as climate changes

Workers across California are grappling with yet another climate change-induced threat: a rapidly spreading fungus that can land its unsuspecting victims with prolonged flu-like symptoms, or far worse. The culprit is a soil-dwelling organism called coccidioides, which is now spreading the disease coccidioidomycosis — known as “Valley fever” — farther and farther north of its Southwest origins. Rather than spreading from person to person, Valley fever results from the direct inhalation of fungal spores — spores climate change is now allowing to flourish in new places.

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Aquafornia news August 29, 2023 Arizona Republic

National Park Service plans predator kill to aid Colorado River fish

National Park Service biologists planned to close off and poison a slough connected to the Colorado River upstream of the Grand Canyon to kill young, non-native bass this weekend, the agency said. It’s the second time that officials have used rotenone, a fish-killing agent, as an emergency measure to slow a mushrooming smallmouth bass invasion from Lake Powell that threatens native humpback chubs that swim the Colorado farther downstream. This time they’re seeking hundreds of young bass, instead of the handful first detected in the slough between Glen Canyon Dam and Lees Ferry last year.

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Aquafornia news August 21, 2023 The Associated Press

Chemical treatment to be deployed against invasive fish in Colorado River

The National Park Service will renew efforts to rid an area of the Colorado River in northern Arizona of invasive fish by killing them with a chemical treatment, the agency said Friday. A substance lethal to fish but approved by federal environmental regulators called rotenone will be disseminated starting Aug. 26. It’s the latest tactic in an ongoing struggle to keep non-native smallmouth bass and green sunfish at bay below the Glen Canyon Dam and to protect a threatened native fish, the humpback chub. The treatment will require a weekend closure of the Colorado River slough, a cobble bar area surrounding the backwater where the smallmouth bass were found and a short stretch up and downstream. Chemical substances were also utilized last year.

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Western Water February 25, 2022 Alastair Bland Sacramento-San Joaquin Delta Map Layperson's Guide to the Delta WESTERN WATER-With Delta Smelt Virtually Gone in the Wild, A "Hatch-and-Release" Program Aims to Save Them From Extinction By Alastair Bland

With Delta Smelt All But Gone in the Wild, A First-Ever “Hatch-and-Release” Effort Aims to Save Them From Extinction
WESTERN WATER NOTEBOOK: Experimental releases of finger-size fish into Sacramento-San Joaquin Delta inspires hope, but also skepticism, about the smelt's future

Crew releases hatchery-raised Delta smelt into the Sacramento-San Joaquin Delta. In the vast labyrinth of the West Coast’s largest freshwater tidal estuary, one native fish species has never been so rare. Once uncountably numerous, the Delta smelt was placed on state and federal endangered species lists in 1993, stopped appearing in most annual sampling surveys in 2016, and is now, for all practical purposes, extinct in the wild. At least, it was.

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Tour September 9, 2021 - 2:30pm - 5:30pm Nick Gray Jenn Bowles Layperson's Guide to the Delta

Bay-Delta Tour 2021
A Virtual Journey - September 9

This tour guided participants on a virtual journey deep into California’s most crucial water and ecological resource – the Sacramento-San Joaquin Delta. The 720,000-acre network of islands and canals support the state’s two major water systems – the State Water Project and the Central Valley Project. The Delta and the connecting San Francisco Bay form the largest freshwater tidal estuary of its kind on the West coast.

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Aquapedia background May 21, 2020 Layperson's Guide to the Delta Unwelcome Visitors

Nutria

Nutria are large, beaver-like rodents native to South America that have caused alarm in California since their rediscovery along Central Valley rivers and other waterways in 2017.

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Western Water January 4, 2019 Douglas E. Beeman

Women Leading in Water, Colorado River Drought and Promising Solutions — Western Water Year in Review

Dear Western Water readers:

Women named in the last year to water leadership roles (clockwise, from top left): Karla Nemeth, director, California Department of Water Resources; Gloria Gray,  chair, Metropolitan Water District of Southern California; Brenda Burman, Bureau of Reclamation Commissioner; Jayne Harkins,  commissioner, International Boundary and Water Commission, U.S. and Mexico; Amy Haas, executive director, Upper Colorado River Commission.The growing leadership of women in water. The Colorado River’s persistent drought and efforts to sign off on a plan to avert worse shortfalls of water from the river. And in California’s Central Valley, promising solutions to vexing water resource challenges.

These were among the topics that Western Water news explored in 2018.

We’re already planning a full slate of stories for 2019. You can sign up here to be alerted when new stories are published. In the meantime, take a look at what we dove into in 2018:

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Tour June 28, 2018 - June 29, 2018 Headwaters Tour Looks at Tree Mortality, Bark Beetle Epidemic & Visits Forest Lab Stantec California Department of Water Resources Association of California Water Agencies California Forest Watershed Alliance Placer County Water Agency

Headwaters Tour 2018

Sixty percent of California’s developed water supply originates high in the Sierra Nevada mountains. Our water supply is largely dependent on the health of our Sierra forests, which are suffering from ecosystem degradation, drought, wildfires and widespread tree mortality.

Headwaters tour participants on a hike in the Sierra Nevada.

We headed into the foothills and the mountains to examine water issues that happen upstream but have dramatic impacts downstream and throughout the state. 

GEI (Tour Starting Point)
2868 Prospect Park Dr.
Rancho Cordova, CA 95670.
View map
  • Tim Quinn
  • John Andrew
  • Tom Smith
  • Dan Segan
  • Jacques Landy
  • Heather Segale
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Western Water June 1, 2018 Space Invaders Gary Pitzer

It’s Not Just Nutria — Sacramento-San Joaquin Delta has 185 Invasive Species, But Tracking Them is Uneven
WESTERN WATER NOTEBOOK: Delta science panel urges greater coordination, funding of invasive species monitoring

Water hyacinth choke a channel in the Sacramento-San Joaquin Delta.For more than 100 years, invasive species have made the Sacramento-San Joaquin Delta their home, disrupting the ecosystem and costing millions of dollars annually in remediation.

The latest invader is the nutria, a large rodent native to South America that causes concern because of its propensity to devour every bit of vegetation in sight and destabilize levees by burrowing into them. Wildlife officials are trapping the animal and trying to learn the extent of its infestation.

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Aquapedia background August 7, 2017 Layperson's Guide to the Delta

Estuary

Suisun Marsh, part of the San Francisco Bay-Delta estuary, is the largest contiguous brackish water marsh on the West Coast of North America.Estuaries are places where fresh and salt water mix, usually at the point where a river enters the ocean. They are the meeting point between riverine environments and the sea, with a combination of tides, waves, salinity, fresh water flow and sediment. The constant churning means there are elevated levels of nutrients, making estuaries highly productive natural habitats.

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Aquapedia background December 29, 2016

Quagga mussel

Quagga musselsA troublesome invasive species is the quagga mussel, a tiny freshwater mollusk that attaches itself to water utility infrastructure and reproduces at a rapid rate, causing damage to pipes and pumps.

First found in the Great Lakes in 1988 (dumped with ballast water from overseas ships), the quagga mussel along with the zebra mussel are native to the rivers and lakes of eastern Europe and western Asia, including the Black, Caspian and Azov Seas and the Dneiper River drainage of Ukraine and Ponto-Caspian Sea.  

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Aquapedia background September 1, 2016

Meadows

While less a scientific term than a colloquial one, meadows are defined by their aquatic, soil and vegetative properties.

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Maps & Posters May 20, 2014

Invasive Species Poster Set

One copy of the Space Invaders and one copy of the Unwelcome Visitors poster for a special price.

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Maps & Posters May 20, 2014

Unwelcome Visitors

This 24×36 inch poster, suitable for framing, explains how non-native invasive animals can alter the natural ecosystem, leading to the demise of native animals. “Unwelcome Visitors” features photos and information on four such species – including the zerbra mussel – and explains the environmental and economic threats posed by these species.

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Maps & Posters May 20, 2014

Space Invaders

This 24×36 inch poster, suitable for framing, explains how non-native invasive plants can alter the natural ecosystem, leading to the demise of native plants and animals. “Space Invaders” features photos and information on six non-native plants that have caused widespread problems in the Bay-Delta Estuary and elsewhere.

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Publication April 17, 2014 Sacramento-San Joaquin Delta Map

Layperson’s Guide to the Delta
Updated 2020

The 24-page Layperson’s Guide to the Delta explores the competing uses and demands on California’s Sacramento-San Joaquin Delta. Included in the guide are sections on the history of the Delta, its role in the state’s water system, and its many complex issues with sections on water quality, levees, salinity and agricultural drainage, fish and wildlife, and water distribution.

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Western Water Magazine September 1, 2013

Two States, One Lake: Keeping Lake Tahoe Blue
September/October 2013

This printed issue of Western Water discusses some of the issues associated with the effort to preserve and restore the clarity of Lake Tahoe.

  • Read more

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