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Source-sink metapopulations are distinct from other types of metapopulations because
a. exchange of individuals only occurs in the former.
b.
c. populations never go extinct in the former.
d. all populations eventually go extinct in the former.
Introduction:
When the network of different populations exchanges its individuals, it is known as metapopulation. This happens because of the distribution of suitable and unsuitable habitat. If there is difference in the habitats of long term populations which affect its growth and decline is known as source-sink metapopulation.
Answer to Problem 1U
Correct answer:
The decline in the population is also considered in the source-sink metapopulation. Therefore, option b. is correct.
Explanation of Solution
Reason for the correct statement:
In source-sink population, there is continuous sending of dispersers from better areas that bolster the population in the areas that are poorer. The better areas or habitats act as the source and the poorer areas or habitats act as sink. If there is no continuous shifting of individuals, then the sink population increases and shows a negative growth and may lead to extinction.
Option b. is given as“populations with negative growth rates are a part of the former”.
As, “Source-sink metapopulations are distinct from the types of metapopulations because populations with negative growth rates are a part of the former”, is the right answer.
Hence, the option b. is correct.
Reasons for the incorrect statements:
Option a. is given as “exchange of individuals only occurs in the former”.
The exchange of individuals occurs in both metapopulations as well as in the source-sink populations. So, it is a wrong answer.
Option c. is given as “populations never go extinct in the former”.
In sink-source metapopulations, if the continuous replenishment is absent, then the poor habitat show negative growth rates that may lead to the extinction of species. So, it is a wrong answer.
Option d. is given as “all populations eventually go extinct in the former”.
Not all the populations show negative growth; only a part of population of poorer habitat show negative growth and extinct. So, it is a wrong answer.
Hence, options a., c., and d. are incorrect.
The metapopulations involves the migration of individuals from one group to another group in a population. In source-sink population, one of the populations with poor habitat may show negative growth.
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