Final Walden Biodiversity Report

My final summary report on the groupings of organisms and the people who found them during Walden Biodiversity Days in 2009 and 1998 is finished and can be downloaded here (5.7 MB). These events wouldn’t have been possible without hundreds of experts and helpers...

Berry Bad Guests: Invasive Aliens at the Dinner Table

In the run-up to Thanksgiving this week Shannon Mullen of National Public Radio interviewed me and Martha Stewart about Oriental Bittersweet, one of the most aggressively destructive invasive plants in the North East US and a staple of holiday decorations. Not...

Spreading the Word

Here’s a clip of my recent appearance on WCVB-TV’s Chronicle, once again trying to spread the word about the problem of invasive alien species. When I say that, I know most people think of UFOs and little green men. Producer Ernie Sarro even leavened this...

Walden Biodiversity Day

On July 3rd and 4th I’ll be leading the second Walden Biodiversity Day, a gathering of top naturalists and field biologists — many of whom participated in the first Biodiversity Day in 1998 — who will fan out to find, identify and photograph over a thousand...

Nature Sense

Here are some excerpts from “Nature Sense with Peter Alden” produced by Ernie Sarro. Invasive alien plants are a major threat to America’s native plants and trees. Look for my regular segment on The Expert Series which airs on many community access...