"Many new species readily emerge on ocean islands because of the isolation, but there are few other species to co-evolve with and thus they have no defence against invasive competitors and predators. The threat can be total. An endemic species under attack has nowhere to escape to. The island conservationist Josh Donlan estimates that islands, which are just 3 per cent of the Earth’s surface, have been the site of 95 per cent of all bird extinctions since 1600, 90 per cent of reptile extinctions, and 60 per cent of mammal extinctions. Those are horrifying numbers, but the losses are extremely local. They have no effect on the biodiversity and ecological health of the continents and oceans that make up 97 per cent of the Earth.
The frightening extinction statistics that we hear are largely an island story, and largely a story of the past, because most island species that were especially vulnerable to extinction are already gone.
The island ecosystems have not collapsed in their absence. Life becomes different, and it carries on. Since the majority of invasive species are relatively benign, they add to an island’s overall biodiversity. The ecologist Dov Sax at Brown University in Rhode Island points out that non-native plants have doubled the botanical biodiversity of New Zealand – there are 2,104 native plants in the wild, and 2,065 non-native plants. Ascension Island in the south Atlantic, once a barren rock deplored by Charles Darwin for its ‘naked hideousness’, now has a fully functioning cloud forest made entirely of plants and animals brought by humans in the past 200 years. (The Ascension Island story opens a new book by environmental journalist Fred Pearce, titled The New Wild: Why Invasive Species Will Be Nature’s Salvation.)"
https://aeon.co/essays/we-are-not-edging-up-to-a-mass-extinction
The frightening extinction statistics that we hear are largely an island story, and largely a story of the past, because most island species that were especially vulnerable to extinction are already gone.
The island ecosystems have not collapsed in their absence. Life becomes different, and it carries on. Since the majority of invasive species are relatively benign, they add to an island’s overall biodiversity. The ecologist Dov Sax at Brown University in Rhode Island points out that non-native plants have doubled the botanical biodiversity of New Zealand – there are 2,104 native plants in the wild, and 2,065 non-native plants. Ascension Island in the south Atlantic, once a barren rock deplored by Charles Darwin for its ‘naked hideousness’, now has a fully functioning cloud forest made entirely of plants and animals brought by humans in the past 200 years. (The Ascension Island story opens a new book by environmental journalist Fred Pearce, titled The New Wild: Why Invasive Species Will Be Nature’s Salvation.)"
https://aeon.co/essays/we-are-not-edging-up-to-a-mass-extinction