How to explain that non native species out competing native species is bad
(I hope this is the correct subreddit for these types of question)
like the title says, how can I explain to my father , that a non native species out competing native species is bad.
Ok, so earlier. me and my father were talking about making a small fishpond for our porch. Somehow we went from talking about needing a permit to put non native fish in a pond, to talking about invasive species. My father said that if an non- native species is introduced to an ecosystem, and then outcompetes native species, then it means that the native species were less adapted to the ecosystem then the species that was introduced to the ecosystem. He then said therefore if an invasive species outcompete a native species then Thats just natural selection.
I feel in my gut that his argument is flawed, but I’m really bad at taking the nebulous ideas in my head, and putting them into words. Can you please help me try to explain to my father why what he said is incorrect