BIOL 4500 Lecture Notes - Lecture 10: Scarlet Tanager, Brood Parasite, Petrochelidon
15 Feb 2018
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Document Summary
>70% of 150 species studied had offspring sired by a male. Purple martins are colonial nesting birds: mature males return fist sand take over the highest, extra pair copulations add 3. 5 fertilized eggs. In north american barn swallows, females choose males on the basis of their breast and belly color. 2005, enhanced the color of paired males and removed eggs to allow fore re-nesting. Enhanced males had higher paternity of the young in their nests females less inclined to play the field. Males with dulled breast color experienced more cuckoldry. Female scarlet tanagers solicit ecps but from males wandering in from more distant territories. Females selectively outbreed more often with distant males. Offspring more likely to survive the first winter (1/11 odds otherwise) If females had epcs from neighboring male usually larger and older than mate = suggesting better genes. Paired male: mate guarding increases paternity except in eastern bluebirds. Frequent populations can occur in bluebirds swamp the sperm.
