4. Rainforests found on islands throughout the Caribbean Sea have a number of en

Question

4. Rainforests found on islands throughout the Caribbean Sea have a number of endemic species (those About 75% of the land area on the island of Cuba to either agricultural or urban use and is thus no longer available for use by these species. The graph below (next page) shows the number of species of reptiles and amphibians present on islands of varying size throughout the Caribbean. Use this curve to predict the approximate percentage of the 75 reptile and amphibian species originally found on Cuba that are in danger of going extinct due to habitat loss found nowhere else but in the native forests of those islands) has been converted from native forest 90 Hispaniola 80 70 Cuba 60 50- Jamaica 40 30 20 Puerto Rico 10 Saba oRedonda 0 20,000 40,000 60,000 80.000 100 000 Area (square kilometers) 120.00

Explanation / Answer

It is known that 75% of the land area of Cuba has been converted due to urbanization. The amount of land deforested can be calculated using the area, i.e. approximately 105 sq.km:

0.75 x 105 = 78.75 sq. km

Thus, only 105 - 78.75 = 26.25 sq. km remains for the survival of endemic species.

According to the graph, around 50 species remain if the land left after deforestation is 26.25 sq.km, i.e 25 species will be in danger.

The percentage of species that can face the risk of extinction is

25 / 75 x 100 = 33.3 %

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