Communication between birds is disrupted near major roadways, where the noise levels are unnaturally high. According to new research from University of Florida Institute of Food and Agricultural Sciences, this avian communication breakdown may help explain the pattern of reduced biodiversity near highways. Authors of the new study were curious about how building homes in an urban environment affected the life of various bird species, such as northern cardinals and tufted titmice. Researchers played Titmouse alarm calls to Cardinals in natural areas near and far from highways. In quieter areas, Cardinals were seen engaging in anti-predator behaviours in response to the alarm calls. However, closer to the highways, the birds failed to respond to the alarm calls. These communication networks are vital to the northern cardinals, which may explain their reduced numbers near busy highways.
Original paper, published on April 21, 2016 in Biology Letters.