A.
Reduced availability of nesting sites
B.
Changes in bird song
C.
Increased food sources
D.
Disrupted circadian rhythms
正确答案:C
译文
Urbanization has had a profound impact on bird populations worldwide. As cities expand, natural habitats are replaced with buildings, roads, and other infrastructure. This leads to a significant reduction in the availability of nesting sites and food sources for birds.
Some species, such as pigeons and sparrows, have adapted well to urban environments, taking advantage of the new resources and structures. However, many other species struggle to survive in these altered landscapes. Therefore, it is imperative to find solutions that help birds adapt to city life. One notable effect of urbanization is the change in bird song. Birds living in cities often sing at higher pitches and volumes than their rural counterparts. This adaptation helps them communicate over the noise of traffic and human activity. Additionally, the artificial lighting in cities can disrupt the natural circadian (daily time-related) rhythms of birds, affecting their breeding and feeding behaviors.
Conservationists are working to [#highlight1]mitigate[/highlight1] the negative effects of urbanization on birds. Initiatives such as creating urban green spaces, constructing bird-friendly buildings, and reducing light pollution are being implemented. These efforts aim to create a more hospitable environment for birds, allowing them to coexist with humans in urban settings.