More than half of the world's human populations now live in urban areas, and this proportion is set to grow.
The findings appear in the Proceedings of the National Academy of Sciences.
"We found that there is a clear urban signal of phenotypic change, and also greater phenotypic change in urbanising systems compared to natural or non-urban anthropogenic systems," said co-author Marina Alberti from the University of Washington's Department of Urban Design and Planning.
"So urbanisation, globally, is clearly affecting things."
Phenotypic change refers to change in an organism's observable traits, such as it morphology, physiology, phenology, or behaviour.-Read More