Promiscuity Forest grouse are solitary Ruffed Grouse, Blue grouse Hummingbirds
The Ruff and multiple mating male strategies Satellite: Heterozygous Non territorial Longer lived 11% copulations Territorial Homozygous recessive Territorial Shorter-lived 89% of copulations if with a sattellite
What leads to different strategies? Polygyny / Promiscuity and lekking? OSR Hot spots Hot shots Female preference Polyandry? OSR Clutch Size Limitations?
Increasing variance in reproductive success leads to increased sexual selection Promiscuity > Polygyny = Polyandry (reversed SD) > Monogamy % of males contributing genes Species 100 0
Convergence (sort of) in African widowbirds Shabby epaulets! What a tail!! Run-away selection – Based on female preference linked to male trait
Sexual selection can lead to ever more elaborate displays in plumage Hummingbirds Neotropical and Nearctic
Birds of Paradise - Australasia
Scissor-tailed Flycatcher Black-billed Magpie In some cases, both sexes display ornament, though males’ may be larger
Hypotheses about sexual selection for these traits?