Living with a Novel Landscape: Suisun Evolves

Invasions Editor's Picks



Adrienne Ernst among the Phragmites. Photo: Michael Adamson
16
Jun

Living with a Novel Landscape: Suisun Evolves

Morning at Suisun Marsh is a living watercolor with a soundtrack. Miles of tule and pickleweed populate the foreground, split by canals glinting silver from the sun. In May, the hills undulate across the northern boundary in classic California gold. A red-tailed hawk’s iconic hoarse screech punctuates the insectine buzz as it takes off from a powerline. At 7:40 AM, it’s already 72 degrees and there’s no trace of a breeze. I’ve come to visit the Marsh from downtown Oakland seeking to learn from biologists, hunters, and land managers what’s at stake in the myriad battles with rising seas, worsening drought, and, especially, encroaching invasive species and what makes it such a singular, attractive landscape.  Indeed, the pastoral foreground is...
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23
Mar

Invasive Mussels Hide in Aquarium Moss Balls

A few weeks ago, someone working in a big-box pet store in the Seattle area informed the U.S. Geological Survey that they had seen suspicious mollusks in ornamental aquarium plants that were being offered for sale. Federal scientists confirmed the presence of zebra mussels tucked away in a clump of Aegagropila linnaei, a green alga marketed as moss balls or marimo balls, and issued a warning through the Nonindigenous Aquatic Species Alert System on March 2. The national Aquatic Nuisance Species Task Force, co-chaired by the U.S. Fish and Wildlife Service and the National Oceanic and Atmospheric Administration, swung into action, bringing in regional networks and state wildlife agencies. On March 3, Martha Volkoff at the California Department of Fish...
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12
Nov

Science-in-Short ~ Aquatic Weeds Podcast

Wall-to-Wall Sampling of the Delta’s Aquatic Weeds Via Remote Sensing, an interview with Shruti Khanna.  In this episode of the podcast, Estuary News reporter Daniel McGlynn talks to Dr. Shruti Khanna, a senior environmental scientist at the California Department of Fish and Wildlife. Their conversation focuses on Khanna’s use of remote sensing technology to study the Sacramento-San Joaquin Delta. Specifically, Khanna analyzes and processes remote sensing data, or high- resolution images collected by sensors mounted on aircraft, to study invasive plant species growing in Delta waterways. Researchers also use remote sensing to study the Delta’s water quality, fish populations, and overall change. While remote sensing will never replace on-the-ground research, the massive data set produced by collecting large-scale images over...
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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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26
Sep

Kitchen Sink Update on Every Last Invader

On multiple fronts, with multiple forces and weapons, California’s battle against invasive aquatic organisms continues. Notoriously, San Francisco Bay is the world’s most invaded estuary. The state’s lakes, rivers, and other freshwater wetlands have their own problematic exotics. Keeping them out, and preventing their spread once established, requires coordination among agencies and levels of government.
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