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

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Presentation on theme: "Avian Mating Systems Table 13-1 Monogamy 90% Polygamy Polygyny 2% Resource defense Female defense Male-dominance Polyandry 1% Polygynandry 1% Promiscuity."— Presentation transcript:

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 Inter vs. intra sexual selection Nice territory! Look at those epaulets! Polygyny – Resource –defense - Redwinged blackbirds 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 Satellite: Heterozygous Non territorial Longer lived 11% copulations Territorial Homozygous recessive Territorial Shorter-lived 89% of copulations if with a sattellite

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 % of males contributing genes Species 100 0

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

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

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17 Birds of Paradise - Australasia

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

19 Hypotheses about sexual selection for these traits?


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