Volunteer spots invasive acacia tree in Honolulu's protected watershed forest
iNaturalist: elena16009
Invasive Species
If you hike Hawaii's watershed trails, this fast-growing nitrogen-fixer can crowd out the native ohia and koa that keep those forests intact, and spotting it early is exactly how citizen scientists help land managers stop it from spreading.
Someone out exploring the Honolulu Watershed Forest Reserve found a Taiwan Acacia tree and logged it on iNaturalist, where other members confirmed the identification, making it an official research-grade record. Taiwan Acacia isn't from Hawaii; it was brought in decades ago and now spreads aggressively, pushing out native plants in forests meant to protect the island's water supply. Records like this one help scientists and park managers know exactly where the tree is showing up so they can plan removal or monitoring.
Key Findings
Observation confirmed as research-grade on iNaturalist, meaning community consensus validated the species identification
Location: Honolulu Watershed Forest Reserve, Honolulu, HI, a protected area managing water resources
Taiwan Acacia (Acacia confusa) is a non-native, nitrogen-fixing tree known to spread aggressively in Hawaiian forest ecosystems
chevron_right Technical Summary
A birdwatcher or hiker confirmed a Taiwan Acacia tree growing in a Honolulu watershed forest reserve, and the sighting was verified by the iNaturalist community as research-grade data. This kind of citizen record helps land managers track where this fast-spreading, non-native tree is establishing itself in protected Hawaiian forest.
Abstract Preview
Original paper
Taiwan Acacia (Acacia confusa) observed in Honolulu Watershed Forest Reserve, Honolulu, HI, US
Research-grade observation of Taiwan Acacia in Honolulu Watershed Forest Reserve, Honolulu, HI, US.
open_in_new Read full abstractAbstract copyright held by the original publisher.
Species Mentioned
Was this useful?
Want to tell us more? (optional)
Thanks for the note!
Something went wrong — please try again.
Too many submissions. Try again in an hour.
Rapid disruption of pollination function by the invasive plant Impatiens glan...
That pretty pink-flowered plant spreading along your local riverbank or woodland edge could be quietly starving native wildflowers of the bee visits they nee...
Acacia confusa is a perennial tree native to South-East Asia. Some common names for it are ayangile, small Philippine acacia, Formosa acacia, Philippine Wattle, and Formosan koa. It grows to a height of 15 m. The tree has become very common in many tropical Pacific areas, including Hawaii, where ...