Comment by bastawhiz
TIL that earthworms in the American northeast are largely invasive species. That's very surprising to me
TIL that earthworms in the American northeast are largely invasive species. That's very surprising to me
https://en.m.wikipedia.org/wiki/Invasive_earthworms_of_North...
Also learning about this today. Apparently they're bad for ecosystems that had evolved with slowly decaying organic matter (because they eat it all quickly). In particular forests.
At least in my education they have always been framed as a vital component of the ecosystem and a sign of healthy soil. It's interesting to learn that's not true.
The problem isn't "because it was caused by humans" per se. Invasive species because of the speed they migrate. Adapting genetically changing environment is the core of life in our planet, but it takes thousands of generations. Humans spread invasive species much faster than the local fauna can adapt.
There's invasive species that are hugely problematic, converting whole forests from fungal decomposition of leaves to bacterial (changing the soil conditions quite a lot).
I've read this, but I'm not 100% clear on this. I think it's probably entangled with the glaciation / interglacial transition, which happened relatively recently. Earthworms are invasive in Michigan, but so are _trees_ in that timescale. It seems like having a foot thickness of forest duff decomposing slowly is probably not a very ecologically stable situation, and might be a temporary phase as the forests creep northwards and the temperatures creep up. Earthworms are not especially frost-hardy, and need to burrow deep enough to survive frost, which is physically difficult as you go farther north.
Has a drastic change occurred in the forest floors of, say, temperate Georgia?
I guess I don't care to understand your point.
The earthworms I am talking about were introduced by modern fishermen and have reduced mushroom habitat.
Are they problematic though? There were earthworms there before the ice age I think.