13 November 2020

Extra-pair copulations


Males: extra-pair offspring

Females:offspring of better quality and of higher genetic variability

Brood parasites



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Alternative mating strategies

AMS: Mating strategy used by male or female, often with distinct phenotypes, that differs from the prevailing mating strategy of their sex.

Example: Salmon jack males

AMS - salmon example



\(1.01 = \frac{fighter} {sneakers}\)

AMS - evolution

Both conventional and alternative mating behaviours arise through sexual selection.

  1. Frequency-dependent selection
  2. Status-dependent selection

AMS - frequency-dependent

AMS - status-dependent

AMS - sex change

Examples:

Moon wrass: protogynous hermaphroditism:
female -> male

Clown fish: protandrous hermaphroditism:
male -> female

AMS - sex change

Size-based selection