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Avian Mating Systems Table 13-1 Monogamy 90% Polygamy Polygyny 2% Resource defense Female defense Male-dominance Poly

Avian Mating Systems Table 13-1 Monogamy 90% Polygamy Polygyny 2% Resource defense Female defense Male-dominance Polyandry 1% Polygynandry 1% Promiscuity 6%. Behavioral Monogamy - most prevalent. What leads to different strategies? Why Monogamy?.

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Avian Mating Systems Table 13-1 Monogamy 90% Polygamy Polygyny 2% Resource defense Female defense Male-dominance Poly

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  1. Avian Mating Systems Table 13-1 Monogamy 90% Polygamy Polygyny 2% Resource defense Female defense Male-dominance Polyandry 1% Polygynandry 1% Promiscuity 6%

  2. Behavioral Monogamy - most prevalent

  3. What leads to different strategies? Why Monogamy?

  4. But extra pair copulations common in many behavioral monogamous birds EPC’s vs EPF’s Why? Direct Genetic

  5. Polygyny –Resource –defense - Redwinged blackbirds Inter vs. intra sexual selection Nice territory! Look at those epaulets! Orians’ Polygyny Threshold Model

  6. Polygyny – • Female defense (Harem) – Grackles • Wild Turkeys – winter flock • sibling males and • harems of 4 -7 females

  7. Polygyny – Male hierarchy “lekking” Open area grouse - Sage grouse, prairie chickens , manakins

  8. Polyandry Sequential – phalaropes Simultaneous – spotted sandpiper and jacanas

  9. Promiscuity Forest grouse are solitary Ruffed Grouse, Blue grouse Hummingbirds

  10. The Ruff and multiple mating male strategies Territorial Homozygous recessive Territorial Shorter-lived 89% of copulations if with a sattellite Satellite: Heterozygous Non territorial Longer lived 11% copulations

  11. What leads to different strategies? Polygyny / Promiscuity and lekking? OSR Hot spots Hot shots Female preference Polyandry? OSR Clutch Size Limitations?

  12. Increasing variance in reproductive success leads to increased sexual selection Promiscuity > Polygyny = Polyandry (reversed SD) > Monogamy 100 % of males contributing genes 0 Species

  13. Convergence (sort of) in African widowbirds Shabby epaulets! Run-away selection – Based on female preference linked to male trait What a tail!!

  14. Sexual selection can lead to ever more elaborate displays in plumage Hummingbirds Neotropical and Nearctic

  15. Birds of Paradise - Australasia

  16. In some cases, both sexes display ornament, though males’ may be larger Black-billed Magpie Scissor-tailed Flycatcher

  17. Hypotheses about sexual selection for these traits?

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