Question

In their study of plant colonization on newly created islands in Lake Hjalmaren, Sweden, Rydin and Borgegard (1988) found that

Select one:

a. only large islands had reached a constant number of species

b. only large and medium islands had reached a constant number of species

c. all islands had reached a constant number of species

d. the number of plant species had declined on all islands over the previous 50 years due to competitive exclusion

Answer 1

In each ecosystem, the population reached the carrying capacity. so all islands had reached a constant number of species. island population depends on the size and distance of the island from the mainlands. in the small islands to maintain the equilibrium by high extinction rate far the regional population and low immigration and in case of large islands have low extinction and high immigration. so on the basis of MacArthur and Wilson island maintain to the constant population size. option C is correct.