Photo AI
Copy the graph into your answer book - Leaving Cert Biology - Question 15(c) - 2013
Question 15(c)
Copy the graph into your answer book. Then, on the same axes and using a dashed line ( . . . . ), show how you think the population of the predator's main prey speci... show full transcript
Worked Solution & Example Answer:Copy the graph into your answer book - Leaving Cert Biology - Question 15(c) - 2013
Step 1
Copy the graph into your answer book and show the predator's prey population
Answer
To represent the fluctuations in the prey population alongside the predator population graph, I will draw a dashed line that peaks slightly after the peaks of the predator population, indicating a time lag between the predator and prey populations. The prey peaks will be higher than the predator peaks, reflecting the idea that when predator populations increase, it does not immediately lead to a decline in the prey population.
Step 2
Give an explanation of the graph that you have drawn for the prey species
Answer
The graph reveals a characteristic predator-prey dynamic where predator populations tend to lag behind prey populations. This time lag occurs because as prey populations grow, predators have more food available, which allows their population to increase. However, the prey population must first reach a certain level before the predator population can increase in response. Hence, during periods of high prey availability, predators will show a delayed increase in their numbers, creating an oscillating pattern.
Step 3
Do you think that population graphs for a host species and its main parasite would show similar fluctuations? Explain your answer
Answer
Yes, I believe that population graphs for a host species and its main parasite would show similar fluctuations. The reason for this is the interdependent relationship between the host and its parasite. As the host population increases, it provides more resources for the parasite, allowing its population to thrive. Consequently, as the parasite population also rises, it can negatively affect the host, leading to a decline in host numbers, which in turn would impact the parasite population. This dynamic creates a cyclical pattern similar to that of predators and prey.
Step 4
Suggest a role for parasites in the overall scheme of nature
Answer
Parasites play a crucial role in the ecosystem by regulating host populations, thus contributing to ecological balance. By controlling host species populations, parasites help prevent overpopulation, which can lead to resource depletion. Furthermore, some parasites can induce behavioral changes in their hosts, affecting the host's reproduction and survival rates. This intricate balance fosters biodiversity and helps maintain stability within habitats.
Step 6