Physical Traits and Genetics in Pigeons
Believed to have been domesticated in the Mediterranean region up to 5,000 years ago, pigeons are providing new insight into the role of genetics in the development of physical traits. A study being carried out by the University of Utah, in the United States, has revealed that there is an enormous amount of diversity among these birds, with more than 350 breeds of pigeons differing in body size, color, patterning, beak size and shape, posture, skeletal structure, vocalizations, flight behavior and feather placement.
Enlisting the help of pigeon breeders around the world, the study focused on the visible traits and genetic relationships of 361 pigeons representing 70 domestic breeds, as well as populations on the Isle of Skye in Scotland and Salt Lake City, Utah.
Michael Shapiro, assistant professor of biology at the University of Utah, and the senior author of the study which was published in the journal Current Biology earlier this year, noted that it was observed during the study that similar traits can be found in birds that are distantly related, and conversely, closely related birds can at times look quite different. Among the examples cited to support the study is the fact that both the English trumpeter pigeon and the German owl pigeon have crested head feathers despite not being closely related. Furthermore, English trumpeters have feathers on their feet similar to that of English pouters, and yet the two species are not closely related, as is the case of the short beaks shared by the African owl pigeon and the Budapest short-faced tumbler. On the other hand, the closely related African owl and German owl pigeon have short beaks in common, but the African owl has plain head feathers, with the German owl sporting a head crest.
Other interesting findings of the study include the fact that free-living pigeons, such as those commonly found in cities, particularly around statues, carry the DNA of racing pigeons. Some of the traits found in pigeons are likely as a result of selective breeding, as is the case with other domesticated animals, such as dogs, but many of the traits found in pigeons are as a result of adapting to their environment. Shapiro pointed out that many different animals use the same genes in order to build similar body structures, and if scientists can understand which genes are behind normal diversity in the wild through the study of pigeons, this knowledge could ultimately provide insight into diversity in humans, including human disease.