Today's lecture focuses on the impact of climate change on migratory birds. Specifically, we'll examine how rising temperatures alter the timing of spring migration. A recent study from the University of Oxford tracked 20 species over a decade. It found that birds now arrive at their breeding grounds, on average, 2.5 days earlier per decade. This shift is problematic because the peak availability of their main food source, insects, has not advanced at the same rate. Consequently, chicks may hatch when food is scarce, reducing survival rates. However, the study also noted that species with shorter migration distances have adapted better than long-distance travelers.
❓ Según la conferencia, ¿qué problema enfrentan las aves migratorias debido a la llegada más temprana de la primavera?
A. A. No pueden encontrar lugares adecuados para anidar.
B. B. Sus polluelos pueden eclosionar cuando el alimento es insuficiente.
C. C. Se ven obligados a migrar distancias más largas.
D. D. Sus depredadores también han cambiado el momento de la migración.
✅ 正确答案
B. Their chicks may hatch when food is insufficient.