what’s the issue with the introduction of foreign species to habitats in which they thrive? Change is a part of life and we humans ourselves are a foreign species everywhere outside of Africa.
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Imagine it this way.
Your are a nomadic person collecting grapes from a field. You spend your entire life collecting these flowers, at the end of the day you have a whole box of grapes and your full. You do this every day, and seeming as you have 1000 grape plants in your area so you simply can’t run out.
One day a farmer (the invasive species) who owns a field hundreds of miles away has been accidentally fallen asleep during the transport process and has now been brought to where you are. Where he is from, he has a very different ecosystem where theirs people like him who eat grapes but the government periodically stops a few farmers (hunting). As the farmer is especially obese, he also eats 10x as much as you do in the same time – as the unopposed species (as he has just moved there), he has the advantage of having no one stop him. He therefore harvests your whole field before the year ends, and you end up starving.
When you don’t belong to an ecosystem, you have nothing to stop you from taking the resources – the predators aren’t looking out for you and by the time anything changes the food starts to run out. This then becomes a massive domino effect.
We get extremely bothered then as the bigger animals prevalently seem to suffer the most, as they have the biggest diets and the thing below them is also struggling (and dies out) so it dies out.
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