Immigration rates decline as the SIZE of an island decreases. True False Extinct

Question

Immigration rates decline as the SIZE of an island decreases. True False Extinction rates decline as the number of species on an island decreases. True False Extinction rates as the size of an island increases. True False All else being equal, turnover rates are higher on large islands than on small ones. True False When we think of islands, we often think of them as land masses surrounded by water. Ecologists have and suggested a much broader definition of an island. Which of the following would NOT be viewed as an island by an ecologist? Mountain top habitats Urban parks Caves The Sahara desert Horses originated in North America and then migrated to Asia and Europe. As they migrated, they evolved over many generations into the horse species we see today. This is an example of which migration type? Diffusion Jump Dispersal Secular Migration Horses went extinct in North America and did not return until they were ferried in boats by European settlers (no land mammal can swim on its own across an ocean). From a horse's perspective, the ocean barrier is best described as what? A corridor A filter A sweepstakes route In the figure to the right, islands A and B are the same size and distance from the mainland. One of them Caves has some smaller islands between it and the mainland. Based on island biogeography, what difference would you expect to see species richness between A and B, and why? Island A should have more species than lsland B, because Island B's extinction rate should be higher. Island B should have more species than lsland A, because Island B's colonization rate should be higher. Island A should have more species than Island B, because Island A's colonization rate should be higher. Island B should have more species than lsland A because lsland A's extinction rate should be higher.

Explanation / Answer

Please find the answers below and explanations in parentheses:

Answer 18: True (As the size of the island decreases, the area available for residence also decreases. This increases competetion between the population for available resources and thus the tendency of individuals to further immigrate on that land decrases.)

Answer 19: True (As the number of species decline on the island, the number of individuals competing for the resources available also decreases. This generates more chances of availability of the resources for one type of species and thus, it flourishes on the island)

Answer 20: False (As the size of island increases, simultaneous increase of naturals resources also takes place. This provides more chances for the individuals to utilize them and survive, hence the rate of extinction decreases)

Answer 21: True (If all other environmental and biological factors are kept constant, a larger surface area for residence provides more chances to the population to survive and flourish. This promotes exponential increase in population growth and consequently, higher turnover numbers.)

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