1) Species Exploitation - including the collection for souvenirs, and especially for food: for example, the famous Dodo of Mauritius was hunted to extinction. Today, some species of marine turtles are hunted and are now endangered
2) Introduced Species - lack of mammal predators meant that indigenous species were less wary and could not cope with alien species. This also meant that the populations of introduced herbivores like goats were uncontrolled and could therefore make plant species vulnerable to extinction. Rats are another example, as they are accidentally introduced by ships, and may pose threats as they eat eggs of ground-nesting birds
3) Habitat Destruction - including land-use change as agriculture expands and urban areas encroach into habitats, often as a result of growing tourism
4) Sea Level Rise - a result of climate change, this changes the abiotic factors by affecting moisture content and salinity as well as temperature. This can threaten particular coastal habitats
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