Skip to content

Earthworm Mania!

Did you know New Hampshire has no native earthworms? 

After glaciers receded from this part of the country at the beginning of the Holocene, the land was scoured and effectively soil-free. This habitat was unwelcoming to soil-dwelling earthworms, which cannot migrate far without human intervention. . .

Enter explorers! After Europeans arrived in North America, earthworms hitching a ride on their ships were able to colonize New England. These days, earthworms are still moving around New Hampshire with the help of humans--as fishing bait, in soil on the wheels of logging equipment, and more.

So how does the introduction of earthworms into forests across New Hampshire affect soil properties? This is the question our students in Ecology lab here at Dartmouth are going to investigate! But before we set them loose, we decided to see for ourselves just how many earthworms live at the local forest across from the Dartmouth Organic Farm...  

It takes a team to successfully search for worms

Sure enough, we found a fair few! We identified at least five species.

Worms in our collection bucket after they were counted and identified

Nightcrawlers are great for catching fish...and teaching assistants!

Our trip was a roaring success--worms galore, beautiful fall weather, and great enthusiasm for introducing our Ecology students to this interesting study system!