Samuel Chan

Extension Specialist in Watersheds & Aquatic Invasive Species

541-737-1583
[email protected]

Expertise: Invasive species

Department/Unit: Oregon Sea Grant Extension

Content by Samuel Chan

Invasive jumping worms disrupt Oregon soils and ecosystems

Jumping worms stay in the debris on top and eat two to three times the amount of leaf litter as the other worms.

Kym Pokorny, Chris Branam | Jul 24, 2025 | News story

Experts warn against releasing non-native fish for mosquito control

"Do-it-yourself” solutions aren’t effective for mosquito control, and they aren’t good for the environment.

Chris Branam | Jul 29, 2022 | News story

Stopping the spread of jumping worms calls for vigilance

The jumping worm, an invasive species new to Oregon, harms the soil by reducing it to granules, making it more porous and less able to retain water. Here's how to identify jumping worms and help stop their spread.

Gail Langellotto, Samuel Chan, LeAnn Locher | May 2021 | OSU Extension Catalog Peer reviewed (Gray level)

Pest alert: Invasive zebra mussels arrive in Oregon in "moss" balls sold for aquariums

Pest alert! The highly invasive Zebra mussel has made it into Oregon through moss balls, popular among aquarium hobbyists and commonly sold in pet stores. Invasive species experts say potentially contaminated moss balls should be destroyed.

Adriene Koett-Cronn, Samuel Chan | Mar 2025 | OSU Extension Catalog Peer reviewed (Gray level)

Zebra & Quagga Mussels Species Guide

This guide provides in depth information on invasive zebra and quagga muscles. It is a companion resource to the Menace to the West an invasive species curriculum. Appropriate for grades 8-12.

Samuel Chan, Tania Siemens, Rick Cooper | Mar 2021 | Online resource

Zebra & Quagga Mussels: Species Guide At A Glance

This is a one-page fact sheet about invasive zebra and quagga mussels. It includes a map of the U.S. where the mussels have spread and other quick facts. The sheet is part of the invasive species curriculum Menace to the West. It is hosted on the Oregon Sea Grant website.

Samuel Chan, Tania Siemens, Rick Cooper | Mar 2021 | Online resource

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