Explain the differences between r-strategists and k-strategists. Give an example

Question

Explain the differences between r-strategists and k-strategists. Give an example of each of these reproductive strategies. Calculate the population growth rate (PGR) for a country with a birthrate of 25.2 per 1000, a death rate of 17.6 per 1000, and a migration rate of -2.3 per 1000. Give the PGR as a percentage. In 1911, 25 reindeer were placed on St. Paul Island, a small island off the coast of Alaska. They were put there to replace caribou that had become extinct on the island. By 1938, the population of reindeer had reached over 2000. This large population of reindeer soon exhausted the available food supply and many starved. By 1950, only 8 reindeer were present on St. Paul Island. It now has a population of about 800 reindeer. The population of reindeer has remained around 800 for some time. A. What mistake was made when the reindeer were introduced to St. Paul Island? B. Considering what you read about carrying capacity, was there an unexpected result in 1938? Explain why or why not. C. Considering what you read about carrying capacity, was there an unexpected result 1950? Explain why or why not. D. What is apparently the carrying capacity of St. Paul Island for reindeer?

Explanation / Answer

45)

A. The mistake that was made when the reindeer was introduced to st.Paul island was that the 'food resources' were not increased.

B. In 1938, showing exponential growth, the population has reached to a number of over 2000, which is considered as the maximum carrying capacity.

C. In the year 1950, a drastic change was seen in the population and exhibiting the least or minimum carrying capacity due to unavailability of food sources and starvation.

D. Finally the population of reindeer has remained at 800 for some time, which is conidered as the carrying capacity.

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