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

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Presentation Transcript
slide1

Avian Mating Systems

Table 13-1

Monogamy 90%

Polygamy

Polygyny 2%

Resource defense

Female defense

Male-dominance

Polyandry 1%

Polygynandry 1%

Promiscuity 6%

slide4

But extra pair copulations common in many behavioral monogamous birds

EPC’s vs EPF’s

Why?

Direct

Genetic

slide5

Polygyny –Resource –defense -

Redwinged blackbirds

Inter vs. intra sexual selection

Nice territory!

Look at those

epaulets!

Orians’ Polygyny Threshold Model

slide6

Polygyny –

  • Female defense (Harem) – Grackles
  • Wild Turkeys – winter flock
  • sibling males and
  • harems of 4 -7 females
slide7

Polygyny – Male hierarchy

“lekking”

Open area grouse - Sage grouse,

prairie chickens , manakins

slide8

Polyandry

Sequential – phalaropes

Simultaneous – spotted sandpiper and jacanas

slide9

Promiscuity

Forest grouse are solitary

Ruffed Grouse, Blue grouse

Hummingbirds

slide10

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

slide11

What leads to different strategies?

Polygyny / Promiscuity and lekking?

OSR

Hot spots

Hot shots

Female preference

Polyandry?

OSR

Clutch Size Limitations?

slide12

Increasing variance in reproductive success

leads to increased sexual selection

Promiscuity > Polygyny = Polyandry (reversed SD) > Monogamy

100

% of males

contributing

genes

0

Species

slide13

Convergence (sort of) in African widowbirds

Shabby epaulets!

Run-away selection –

Based on female preference

linked to male trait

What a tail!!

slide15

Sexual selection can lead to ever more elaborate displays

in plumage

Hummingbirds Neotropical and Nearctic

slide18

In some cases, both sexes display ornament, though males’ may be larger

Black-billed Magpie

Scissor-tailed Flycatcher