Respuesta :
The Grants found that the birds who survived the 1977 drought tended to have larger offspring with larger beaks. The subsequent generation saw an increase in larger-beaked finches as a result of this ecological adaptation.
The Grant research team discovered that although the number of finch had increased during the drought, the average size of their beaks had increased. The main reason for this was that during the drought, large seeds with thick husks were still readily accessible, but small seeds were exceedingly scarce. The Grants returned to Daphne Major in 1978 to investigate the effects of the drought on the offspring of the medium ground finches. They looked at the young and compared the size of their mandibles to that of the ancestors (before to the drought). It was found that the beaks of the offspring were 3-4% larger than those of the grandparents.
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