EasyBiologyHigh School (11–12)Ecology and Environment › Biodiversity and ConservationNumericalAPA-LevelIB
In a region, the species-area relationship has Z = 0.15…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
In a region, the species-area relationship has .
- By what factor does the number of species rise when the area is doubled?
- By what per cent does the number of species rise?
- By what factor does it rise when the area becomes ten times as large?
Need a reminder? The key ideaShow
The species-area relationship is , or . The slope is , and it is 0.1 to 0.2 for regions and 0.6 to 1.2 for whole continents. When an area falls to a fraction of its size, the species fall to of their number.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. .
Plan. If the area becomes times as large, the species become times as many.
Step 1. (a) .
Step 2. (b) per cent.
Step 3. (c) .
Answer: ; per cent; .
Check. A tenfold area gives far less than ten times the species.
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