Another invasive fern

What's up with ferns? I knew this one was listed as invasive in Florida, but I didn't realize what an impact it was having in the Everglades. Good article...



Invasive Fern May Nullify Glades Effort
By CAROL J. WILLIAMS Los Angeles Times

Published: May 7, 2007

LOXAHATCHEE NATIONAL WILDLIFE REFUGE - Like the insatiable plant from the musical "Little Shop of Horrors," a verdant menace is eating the Everglades.

The Old World climbing fern, known to botanists as "Lygodium microphyllum," spreads its asphyxiating fronds like fingers around the necks of native cypress and mangroves. It smothers the flora of the glades' unique tree islands and starves out the endangered wood storks and other fauna.

"You can't cut it because it grows right back. You can't burn it without harming what it covers. You can't kill it with water because it survives varying hydrologies," said Bill Miller, a U.S. Fish and Wildlife Service biologist.

And, Miller laments, "Nothing in the Everglades feeds on lygodium."

The Old World climbing fern and other invasive plants now cover more than 2 million acres of the Everglades, including 70 percent of this national refuge and ever-expanding stretches of Everglades National Park, Big Cypress National Preserve and the Seminole and Miccosukee reservations. When environmentalists talk about invasive species in the Everglades, they often are referring to Nile monitor lizards, 350-pound Komodo dragons from Indonesia or the Burmese pythons abandoned there by humans. The pythons are now challenging alligators for supremacy in the swamp.

The rapacious fern, which originated in Australia, doesn't grab attention in quite the same way.

But biologists and conservationists contend the non-native plants pose a greater risk to survival of the Everglades, half of which has disappeared after a century of bulldozing and dredging.

Scientists also warn that efforts to contain and eventually eradicate alien plants increasingly will challenge federal, state and local budgets, which are struggling to ante up their shares of the $8 billion committed through the Comprehensive Everglades Restoration Plan.

The Everglades is a natural resource that has been hard to love. Its malodorous, sweltering bogs are a sanctuary more for creatures that bite, sting and slither than for humans. But as a shelter for rare birds, flowers and animals, conservationists dating to Florida settlers have fought to preserve it.

The 2000 Everglades restoration project is aimed at correcting the engineering and development intrusions that have reduced wading bird populations by 95 percent, endangered 68 plant and animal species, and cut water flow through the glades by 70 percent.

It would refill canals, restore the natural flow of rivers, and cease mining and other industry encroaching on protected areas. It also would relocate some farming communities established during the early 20th century that now require water diversions and electricity in the government-protected refuges and release polluted irrigation water into the everglades' re-engineered flow.

But the nation's biggest environmental repair project ever pays little heed to the problem of invasive species, which nature defenders warn could nullify the results of spending $8 billion to clean and re-plumb the national treasure.

If left untreated, lygodium will cover an area of South Florida larger than the entire Everglades National Park within seven years, according to a projection by Florida Atlantic University biology Professor John Volin.

The Kudzu of the Everglades. I've read a little bit about this beast but didn't realize the projections for invasion were going to be so incredibly sobering. Thanks for posting this. Really great eye opener.

I have Japanese climbing fern here. It is impossible to kill and it reaches high into the pine trees creating a dangerous fire hazard.