Re: Species impact
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A clear choice didn't pop up for the people having the conversation that inspired this thread. One of the things I was thinking of is not what affects the ecosystem but what prevented humans from affecting the ecosystem. For example, malaria was, and is, really an impediment to developing the kinds of nature obliterating civilization seen outside of the tropics. So one of the Plasmodiums could be a reasonable choice. But then, maybe we just need to consider one of the Anopheles mosquitoes as the species here, since they are the vector.
I still feel like I'm missing something obvious.
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When I first opened the thread i was thinking rats as far as other mammels go. I don't really know how many different species of rodent are comomnly associated with humans, but some have been responsible for extinction of quite a few species when they were transported to islands, and have carried quite a few major deseases with them.
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