United Germany Spain 28. Blackcap birds (Sylvia atricapila) migrate out of Germa

Question

United Germany Spain 28. Blackcap birds (Sylvia atricapila) migrate out of Germany before wintertime. Prior to t a particular blackcap population flew to Spain, which had an abundant natural food source. Now, some members of the same blackcap population tly to the United Kingdom, where food placed in feeders by humans is abundant. The blackcaps return to the same forests in Germany to nest during the breeding season. Some blackcaps that migrate to the United Kingdom have become distinguishable by certain physical and behavioral traits from blackcaps that migrate to Spain. Which of the following best predicts the effect on the blackcap population if humans in the United Kingdom continue to place food in feeders during the winter? (A) The blackcaps that migrate to Spain will selectively mate with the blackcaps that migrate to the (B) The blackcaps that migrate to the United Kingdom will become reproductively isolated from the blackcaps (C) The blackcaps in Spain and the United Kingdom will migrate to other geographical locations in search of (D) The blackcaps will begin nesting at their wintering sites in Spain or the United Kingdom, resulting in a United Kingdom, resulting in increased genetic variation in the blackcap population. that migratc to Spain, resulting in speciation in the blackcap population. potential mating partners, resulting in a smaller blackcap population in Germany. larger blackcap population migrating back to Germany after the breeding season has ended. Unauthorized copying or reuse e

Explanation / Answer

Answer: Choice D

Explanation: According to the information, the birds are migrating to either Spair or UK for food before winter begins at Germany. The birds find plenty of food at Spain and UK both, in the form of natural and human sources. Thus, this will allow the birds to nest in these location slowly over many generations and thus, their population will increase. Since all the birds are re-migrating to their home-place i.e. Germany, the total number of birds returning will be large (since they healthily nested at Spain and UK). Thus, the final bird population returning at Germany would be higher than the popolation migrating off initially.

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