ANTC23H3 Lecture Notes - Lecture 7: Mate Choice, Laryngeal Ventricle, Polygynandry

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Published on 22 Jun 2011
School
UTSC
Department
Anthropology
Course
ANTC23H3
Professor
Lecture 7 June.14.11 BLUE FONT
SLIDE SEXUAL DIMORPHISM:
Body size and shape
Colour: sexual dichromatism
SLIDE SEXUAL DIMORPHISM (CONT.):
Sexual Monomorphism : sexes are the same size, colour, etc.
SLIDE SEXUAL DIMORPHISM (CONT.) 2:
Why? Male-male physically aggressive contest competition over females
Larger body size in males has been selected for because this trait has been adaptive in
these species
SLIDE 2 TYPES OF COMPETITION:
1)Contest competition : when a resource can be monopolized by a single individual or
group and can be fought over (size and strength are an advantage)
SLIDE 2 TYPES OF COMPETITION (CONT.):
2)Scramble competition : when a resource is exploited by the individual that arrives
and uses it first
Example: aye-ayes are solitary, when females are estrus, whoever finds her first can
mate with her
SLIDE SEXUAL DIMORPHISM & MATING SYSTEMS:
Polygyny
SLIDE SEXUAL DIMORPHISM & MATING SYSTEMS (CONT.):
www.notesolution.com
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Document Summary

: sexes are the same size, colour, etc. Larger body size in males has been selected for because this trait has been adaptive in these species. Slide 2 types of competition: contest competition group and can be fought over (size and strength are an advantage) : when a resource can be monopolized by a single individual or. Slide 2 types of competition (cont: scramble competition and uses it first. : when a resource is exploited by the individual that arrives.  example: aye-ayes are solitary, when females are estrus, whoever finds her first can mate with her. Slide sexual dimorphism & mating systems (cont. www. notesolution. com.  polygynandrous species sometimes have sexual dimorphism (with larger males)  monogamous species are usually sexually monomorphic in body size.  most apes are sexually dimorphic in body size (with larger males: except for gibbons and siamangs.  many old world monkeys are sexually dimorphic in body size (with larger males)