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Prelim 2, Lecture 19: Sexual and Social Behaviors

Terms in this set (72)

On the slide, male territories were mapped out on a lake. This species of bird is a migratory one, going to Africa for the winter and Sweden in the spring--males get back first to establish territory and to sing.

In a study, females were brought back a week early and tracked. Dots on the map show where their location was every ten minutes--if there were many dots in a particular place, it means they stayed there for a long time--such places ere those where they could hear multiple males. At the end of the day, they would show up at the territory of the male who had the fanciest song--not necessarily the fanciest song overall, but the fanciest of what she had heard THAT DAY.

They'll hanky-panky, but since the male didn't know she was there until she came back, the interaction was a result of the female's choice. They build a nest and then they have babies.

Without the manipulation of migration, the study was run again--they waited for nesting and took DNA samples from the mom, dad, and the babies to work out their parentage. The genetic mom took care of all of the babies, but 5% had different biological fathers than social fathers. In those 5% of cases, the biological father had a fancier song than the social father--as was alluded to before, the female chose who to nest with on incomplete information--in one day, she can't complete her survey of all the males' songs. Once she's able to do this, she can lay her eggs, but she needs someone else to build a nest with in preparation for all that.