Which came first: the nourishing or the bird?
It seems clear, but the answer may not be very simple. According to a recent study in Global biologyThe use of humans in humans has changed the sizes and shapes of the tannous bird beak in Anna, and its scope of a narrow pocket in California to the coast to the British Columbia.
Nicholas Alexander, one of the authors of the paper, collaborated with 15 other researchers from a cumulative institution of 12 institutions to produce the paper, which has been in business since 2019. Alexander compared the spread of Anna Al -Tanana birds with a well -known and lowering bird colleague.
Alexander said: “The tannas of the pigeons are similar to the pigeons of tannas because they expanded in the north by a human settlement.”
The bill change and habitat size at the pace of fracture, speaking evolutionary. The researchers analyzed the archives from NewsPers.com To consider the expansion of the eucalyptus forests in California, a major source of nerve that was presented from Australia in the mid -nineteenth century, and advertisements on the nutrients of the hummingbird. The urbanization statistics were withdrawn from the US census. Bird residents have been based on data from the number of annual birds for Christmas at the Odoubon Association; The forms and sizes of the bill were pulled from the museum samples.
The results were clear: because urbanization, especially after the Second World War, raised the nutrients of the hummingbird California Coast followed, and the tannas of Anna followed, and their beaks became “more pointed and longer” to adapt to a new food source. Alexander said that from the point of view of the hummingbird, the nutrients are irrational.
Alexander said: “Imagine that you have a group of flowers and the shape of the flower will restrict the efficiency you can feed you from that flower. Imagine now that you have this giant tank of always available nectar,” Alexander said. “I want to get the largest amount of nectar with each drink before someone gets me on the feeder.
While the tiny birds of Anna have spread their wings on a larger scale, the inhabitants of the mantle All in the decline. Alexander looks at the situation as an elegant example of human hobbies that drive environmental change, and says that the paper opens questions about the reason for the prosperity of some types in the face of change caused by humans while struggling with many others.
Alexander said: “It is a great example of how morphological change can occur very quickly in response to environmental change,” Alexander said. “There are many other types that are unable to change at the same rate as climate change.”
