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Unformatted text preview: Evolution of migration-Migratory and migratory species-Radiation causes things to exist in separate areas, and reproductive isolation can evolve from one species-Is it really genetically controlled, or is it just response to local conditions? o Phenotype= genotype x environment o Can determine by eliminating environmental conditions o Experiment in Germany, 1950 Birds get restless around migration time Zugunruhe-Common garden o Take three groups, see how things respond-Direction and distance o Measured by the wire mesh and cone setup, with ink on feet-When to go? o From input from environment o Experiment- measured body mass with change in time o Body mass spikes before migration Assimilation varies, actual organs become bigger or smaller Relative intake is different as things different Efficiency goes down during spring, because dont need to maintain. Lots of food around....
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- Spring '12