Today in our biology lecture, we'll discuss the impact of climate change on migratory birds. Recent studies show that warmer springs cause insects to emerge earlier, but many bird species still arrive at their breeding grounds at the same time. This mismatch means that by the time chicks hatch, the peak insect availability has passed, leading to lower chick survival rates. Interestingly, some species, like the great tit, have adapted by laying eggs earlier. However, long-distance migrants, such as the cuckoo, cannot adjust their arrival dates because they rely on daylight cues, not temperature. As a result, their populations are declining more rapidly.
❓ 강의에 따르면, 뻐꾸기 개체수가 큰가슴쥐 개체수보다 더 빠르게 감소하는 이유는 무엇인가요?
A. A. 뻐꾸기는 일광 신호의 변화에 영향을 받습니다.
B. B. 뻐꾸기는 곤충 발생 최성기에 맞춰 번식 시기를 조정할 수 없다.
C. C. 뻐꾸기들은 더 추운 봄 때문에 새끼 수가 더 적다.
D. D. 뻐꾸기들은 이동을 시작하기 위해 온도 신호에 의존한다.
✅ 正确答案
B. Cuckoos cannot adjust their breeding timing to match insect peaks.