A survey sorted 80 pairs of species. There were 22 pairs of mutualism, 14 of commensalism, 20 of…
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A survey sorted pairs of species. There were pairs of mutualism, of commensalism, of predation, of parasitism and of competition.
- In how many pairs were both species helped?
- In how many pairs was at least one species harmed?
- What per cent of the pairs had one species helped and one harmed?
Need a reminder? The key ideaShow
Parasitism (+, −), commensalism (+, 0), amensalism (−, 0), mutualism (+, +), competition (−, −), predation (+, −).
The worked solution
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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. pairs.
Plan. Use the signs of each interaction.
Step 1. (a) Only mutualism helps both: pairs.
Step 2. (b) Predation, parasitism and competition harm at least one: pairs.
Step 3. (c) One helped and one harmed (+, −) is predation and parasitism: . .
Answer: pairs; pairs; .
Check. .
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