According to this species-area curve for reptiles and amphibians on a west indian archipelago, a 50% decrease in area will change the number of species living in the remaining area by

According to this species-area curve for reptiles and amphibians on a West Indian archipelago, a 50% decrease in area will change the number of species living in the remaining area by -10%.  A graph depicting the relationship between the size of a region and the biodiversity that it can support is called a Species-area curve.

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