The herbivorous mammalian species were introduced into an ecosystem at the same time and in equal numbers. The graph below represents their populations during the first seven years.
Study the graph and answer the questions that follow.
(a) (i) Which species has a better competitive ability?
(ii) Give reason for your answer.
(b) Account for the shape of the curve of species A between:
(i) One year and three years
(ii) Three years and seven years.
(c) A natural predator for species A was introduced into the ecosystem. With a reason, state how the population of each species would be affected.
Answer:
a) i)
-Species A
ii)
-The rate of multiplication or growth in A is faster than of species B.
b) i)
- Less competition, few or no predators, more suitable environmental conditions such as food, space, resource were not limiting hence the population increased exponentially or rapidly.
ii)
- Shortage of resources like food or space/limiting birth rate equals death rate hence the population had become stagnant/ constant. Environmental resistant has set in.
c)
- Species A would decrease since they are preyed upon, while species B would increase because there is less competition with species A and hence more resources available.
-Species A
ii)
-The rate of multiplication or growth in A is faster than of species B.
b) i)
- Less competition, few or no predators, more suitable environmental conditions such as food, space, resource were not limiting hence the population increased exponentially or rapidly.
ii)
- Shortage of resources like food or space/limiting birth rate equals death rate hence the population had become stagnant/ constant. Environmental resistant has set in.
c)
- Species A would decrease since they are preyed upon, while species B would increase because there is less competition with species A and hence more resources available.
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