The earthworms in North America are invaders. There used to be native earthworms, but they were wiped out by glaciers around 10,000 years ago and all the current worms arrived accidentally (via humans) from Europe and Asia in the past few centuries.

https://ecosystemsontheedge.org/earthworm-invaders/

And now global warming is causing “global worming”, as worms spread northwards into a warmer Arctic:

https://www.nytimes.com/2023/07/14/climate/invasive-worms-arctic-environment.html

The consequences aren’t clear yet. But it’s a lot of change.

#climate #Earth #worms

Earthworm Invaders

Little-known secret: Almost every earthworm in most of the U.S. came from somewhere else. Native earthworms all but disappeared more than 10,000 years ago, when glaciers from a Pleistocene ice age …

Ecosystems on the Edge

@helenczerski

Intriguing.

So what was happening to American soil for the ~9000yrs in between? Was it a good, bad or indifferent thing?

@gsymon @helenczerski thought I read somewhere once that earthworms were major threat or feared to be to forests or other ecologies here in NA? I'm curious though what prevented them from migrating back from Central America after glaciers retreated?
@helenczerski I did not know that! Fascinating.

@helenczerski

"The consequences aren’t clear yet."

I remember reading about this in Charles C. Mann's book "1493". Doesn't sound like we've learned much more in the decade since.

https://books.google.com/books?id=Veu9u0brhrcC&newbks=1&newbks_redir=0&lpg=PP1&dq=charles%20mann%201492&pg=PA40#v=onepage&q&f=false

1493

From the author of 1491--the best-selling study of the pre-Columbian Americas--a deeply engaging new history of the most momentous biological event since the death of the dinosaurs. More than 200 million years ago, geological forces split apart the continents. Isolated from each other, the two halves of the world developed radically different suites of plants and animals. When Christopher Columbus set foot in the Americas, he ended that separation at a stroke. Driven by the economic goal of establishing trade with China, he accidentally set off an ecological convulsion as European vessels carried thousands of species to new homes across the oceans. The Columbian Exchange, as researchers call it, is the reason there are tomatoes in Italy, oranges in Florida, chocolates in Switzerland, and chili peppers in Thailand. More important, creatures the colonists knew nothing about hitched along for the ride. Earthworms, mosquitoes, and cockroaches; honeybees, dandelions, and African grasses; bacteria, fungi, and viruses; rats of every description--all of them rushed like eager tourists into lands that had never seen their like before, changing lives and landscapes across the planet. Eight decades after Columbus, a Spaniard named Legazpi succeeded where Columbus had failed. He sailed west to establish continual trade with China, then the richest, most powerful country in the world. In Manila, a city Legazpi founded, silver from the Americas, mined by African and Indian slaves, was sold to Asians in return for silk for Europeans. It was the first time that goods and people from every corner of the globe were connected in a single worldwide exchange. Much as Columbus created a new world biologically, Legazpi and the Spanish empire he served created a new world economically. As Charles C. Mann shows, the Columbian Exchange underlies much of subsequent human history. Presenting the latest research by ecologists, anthropologists, archaeologists, and historians, Mann shows how the creation of this worldwide network of ecological and economic exchange fostered the rise of Europe, devastated imperial China, convulsed Africa, and for two centuries made Mexico City--where Asia, Europe, and the new frontier of the Americas dynamically interacted--the center of the world. In such encounters, he uncovers the germ of today's fiercest political disputes, from immigration to trade policy to culture wars. In 1493, Charles Mann gives us an eye-opening scientific interpretation of our past, unequaled in its authority and fascination.

Google Books

It's not my fault that your soil organic matter tastes so yummy 😋🪱

@helenczerski