BGYB51H3 Lecture 6 Notes Sep 29

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Biological Sciences
Maydianne Andrade

BGYB51H3 Lecture 6 Notes -in natural experiments, introduction of new host species are observed in an area to determine ][Z }L}2L]ZKZ -introduction of new host can cause little competition initially compared to original host that suddenly experiences more competition (e.g. soapberry bugs) -]L}2L] ]]}L7ZL}] ]]}L}ZL[ ZL2oooL -in Galapagos Islands, a single lineage of finches underwent an adaptive radiation which diversified their beak characteristics and body sizes as a result of different niches and food -before the drought in the Galapagos Islands, natural selection favoured birds with small beaks -during the drought in the Galapagos Islands, natural selection favoured larger birds with bigger beaks -offspring of survivors of the drought had larger beaks and large body sizes -in the second drought, there was increased competition between large competitors, providing an advantage for smaller birds -evolution is dynamic in that p
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