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If they swam there, no. Invasive species have to be introduced by humans, by definition! The effect of grizzlies on the island ecosystem is unknown, and that ma

If they swam there, no. Invasive species have to be introduced by humans, by definition! The effect of grizzlies on the island ecosystem is unknown, and that may be more of what you're talking about.

derefr 2y ago
> If they swam there, no. Invasive species have to be introduced by humans, by definition! So what do you call it if humans introduce a species to an island A that's really close to another island B — and then the species happens to make the short hop to island B on its own? In a causal sense, that species would not have made it to island B if not for us introducing it to island A.
- tempestn 2y ago
  Yes, when an invasive species spreads from where it was first introduced, it remains an invasive species.
- karaterobot 2y ago
  The article says they probably swam across the Johnstone Straight, from the mainland. There's no mention whatsoever of introducing grizzlies to any nearby island. If you're asking hypothetically, I'd guess it comes down to whether the islands were separate ecosystems, but Wikipedia would be a much better source than me.
cco 2y ago
By what definition? Humans being involved didn't seem common in definitions I found.
- morsch 2y ago
  An invasive species is an introduced species that harms its new environment. https://en.m.wikipedia.org/wiki/Invasive_species https://en.m.wikipedia.org/wiki/Invasive_species An introduced species, alien species, exotic species, adventive species, immigrant species, foreign species, non-indigenous species, or non-native species is a species living outside its native distributional range, but which has arrived there by human activity, directly or indirectly, and either deliberately or accidentally. https://en.m.wikipedia.org/wiki/Introduced_species https://en.m.wikipedia.org/wiki/Introduced_species
  - cco 2y ago
    > The term "invasive" is poorly defined and often very subjective. I too read the Wikipedia article and this sentence prompted me to survey a few other places. Federal law in the US for instance. Your quoted definition doesn't appear in the article covering _invasive_ species, only in "introduced species" which of course implies a human introduced them.
    - morsch 2y ago
      The first paragraph is Wikipedia's definition for invasive species as a kind of introduced species with additional attributes. It's the first sentence in the article. US federal law might be different, I wouldn't know.

If they swam there, no. Invasive species have to be introduced by humans, by definition! The effect of grizzlies on the island ecosystem is unknown, and that may be more of what you're talking about.

derefr 2y ago

> If they swam there, no. Invasive species have to be introduced by humans, by definition! So what do you call it if humans introduce a species to an island A that's really close to another island B — and then the species happens to make the short hop to island B on its own? In a causal sense, that species would not have made it to island B if not for us introducing it to island A.

tempestn 2y ago
Yes, when an invasive species spreads from where it was first introduced, it remains an invasive species.
karaterobot 2y ago
The article says they probably swam across the Johnstone Straight, from the mainland. There's no mention whatsoever of introducing grizzlies to any nearby island. If you're asking hypothetically, I'd guess it comes down to whether the islands were separate ecosystems, but Wikipedia would be a much better source than me.

cco 2y ago

By what definition? Humans being involved didn't seem common in definitions I found.

morsch 2y ago
An invasive species is an introduced species that harms its new environment. https://en.m.wikipedia.org/wiki/Invasive_species https://en.m.wikipedia.org/wiki/Invasive_species An introduced species, alien species, exotic species, adventive species, immigrant species, foreign species, non-indigenous species, or non-native species is a species living outside its native distributional range, but which has arrived there by human activity, directly or indirectly, and either deliberately or accidentally. https://en.m.wikipedia.org/wiki/Introduced_species https://en.m.wikipedia.org/wiki/Introduced_species
- cco 2y ago
  > The term "invasive" is poorly defined and often very subjective. I too read the Wikipedia article and this sentence prompted me to survey a few other places. Federal law in the US for instance. Your quoted definition doesn't appear in the article covering _invasive_ species, only in "introduced species" which of course implies a human introduced them.
  - morsch 2y ago
    The first paragraph is Wikipedia's definition for invasive species as a kind of introduced species with additional attributes. It's the first sentence in the article. US federal law might be different, I wouldn't know.