The beak is the only structure that birds have to process food. Evolutionarily, the beaks of birds have ended up acquiring shapes that allow each species to better obtain its food or adapt to its environment. In fact, the differences between the beaks of the Galapagos finches were fundamental for Charles Darwin to propose the Theory of Evolution, since he observed that for each island the finches had very different beaks, according to the type of food they had at their disposal. scope: thicker and stronger beaks to break seeds, smaller beaks to eat insects … However, a team of international scientists, including researchers from the UAM, has discovered that, mainly in the case of raptors, this hypothesis does not apply. That is, the beak of raptors does not evolve depending on the food they consume. The beak and skull of raptors

are highly integrated According to the Andorra Email Lists study’s lead author, Dr. Jen Bright, the results show that in birds of prey, such as eagles and hawks, the skeleton is highly integrated, implying that the shape of the skull changes in a predictable way relative to how species increase or decrease in size. “In fact, we have seen that the shape of the beak is so closely linked to the shape of the skull in these birds that one cannot change if the other does not change,” explains Bright. The professor at the Autonomous University of Madrid, Jesús Marugán Lobón suggests that “the possibility of breaking this limitation, leaving the peak to evolve independently of the cranial box, may have been a key factor for the rapid and explosive evolution of the thousands of species of birds such as Darwin’s finches. ” To carry out the study, the researchers used

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a three-dimensional analysis method to measure the variation in the shape of the skulls of practically all known raptors, and subsequently statistically evaluate their relationship with the size and trophic habits of the different raptors. . Although more than one of these results lead him to think that Darwin’s Evolutionary Theory is in question, Emily Rayfield, professor at the University of Bristol and leader of the project, affirms that her research does not question Darwin’s ideas, not by much. less. “Instead, it shows how evolution has limited raptor skulls to a particular range of shapes” concludes the expert.outside the genetic code. And is thatThere came a time when Nature could not create new tRNAs that were sufficiently different from what already existed without conflicting in identifying the correct amino acid. And this happened when it reached 20 ” ,

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