[seszett]

I don't have a link though, it's just something that was been repeated at length by the Natural Reserve agents and the ecobiologists to the personnel and visitors while I was on Kerguelen island (precisely about apple cores and egg shells - most of the vegetation is actually in the same Rosaceae family as apple trees, and there are many local bird species).

It makes sense to me, seeing how a single disease like chestnut blight or phylloxera can be very devastating to a population on a whole continent, it could be both as bad but also less noticeable in a natural park.