A group of researchers spent 8 years in the Galapagos Islands measuring
beaks, observing feeding behavior, and measuring rainfall in a
population of a particular species of Darwin’s finch. They found that
this species eats only small seeds and that its beak enables the bird to
crack and eat such seeds quickly and efficiently. The beak-size data are
in the table below.
Develop a hypothesis that explains what caused beak size to increase in
dry years. Your hypothesis should specify how the fates of individuals
determine changes in the population.
Year 1 2 3 4 5 6 7 8
Rainfall normal normal normal very low normal normal normal
normal
Average beak size 10.1 10.3 10.2 12.1 12.5 10.1 10.0 10.1
Biology Homework Solutions
#119168
Species diversity: develop a hypothesis about beak size in finches
A group of researchers spent 8 years in the Galapagos Islands measuring beaks, observing feeding behavior, and measuring rainfall in a population of a particular species of Darwin’s finch. They found that this species eats only small seeds and that its beak enables the bird to crack and eat such seeds quickly and efficiently. The beak-size data are in the table below.
Develop a hypothesis that explains what caused beak size to increase in dry years. Your hypothesis should specify how the fates of individuals determine changes in the population.
Year 1 2 3 4 5 6 7 8
Rainfall normal normal normal very low normal normal normal normal
Avg. beak size 10.1 10.3 10.2 12.1 12.5 10.1 10.0 10.1
The solution suggests and explains the reasoning behind a hypothesis aimed at explaining the data on beak sizes of finches in the Galapagos Islands.
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