Kamil Szepanski wrote:What is the difference between a rare alien species and a rare native species?
Seriously?
Do you want to "save" species in spots outside their natural range? If they cannot sustain themselves within their natural range, you might just as well put them all in a zoo, imho. Or in terraria in everyone's living room
rare alien: irrelevant for the natural survival of the species & even potentially dangerous of becoming invasive, thus detrimental to native fauna and/or flora
<=>
rare native: (given the state of nature in our part of the world) potentially vulnerable
Do you want to start protecting every introduced population? There's a list of hundreds of exogenous plant and animal species which have been observed on 1 or 2 sites only, in Flanders (N Belgium) alone. Feel free to come over and protect them all.
Now, I know that "even potentially dangerous of becoming invasive, thus detrimental to native fauna and/or flora" is hardly applicable in this case - I don't suspect this species will spread throughout Germany competing with endogenous newts or whatever. On the other hand, Speleomantes italicus is not particularly rare within its natural range, thus a German introduction is hardly going to be "The Ark".