This is not a description of colonisation of a new territory. More like evolution of a complex ecosystem over 700, 000 years. Which is quick in evolutionary terms, but a bit ponderous if ine is thinking purely in terms of colonisation.Maybe not so surprising. In more modern times we have examples of animals and plants entering a new territory where they can grow unopposed and they spread like wildfire.
Open access publications are a lot more common these days - ever since the government realized it was spending public money for scientists to do research that ended up behind big publisher paywalls, instead of being available to the public.Actually, my surprise was at the paper being available (i.e. not behind a firewall).