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Lecture 2

ANTC23H3 Lecture Notes - Lecture 2: Infidelity, Mate Choice, Parental Investment


Department
Anthropology
Course Code
ANTC23H3
Professor
Joyce Parga
Lecture
2

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Lecture 2 May.17.11 Blue Font
SLIDE MATING SUCCESS VS. REPRODUCTIVE SUCCESS (RS):
Mating success : # of copulations achieved
Reproductive success (RS) : number of viable offspring produced
SLIDE SEX DIFFERENCES IN THE LIMITING FACTORS FOR REPRODUCTION:
Male reproductive success is limited by access to mates (the number of females he can
inseminate)
SLIDE SEX DIFFERENCES IN THE LIMITING FACTORS FOR REPRODUCTION 2:
Female reproductive success is limited by access to food resources
SLIDE SEX DIFFERENCES IN POTENTIAL REPRODUCTIVE RATES:
Females limited by gestation and lactation
Males only limited by # of successful fertilizations
SLIDE SEX DIFFERENCES IN POTENTIAL REPRODUCTIVE RATES 2:
Males can have hundreds of children across a lifetime
Womens maximum possible RS is much more limited
SLIDE SEX DIFFERENCES IN POTENTIAL REPRODUCTIVE VARIABLITITY:
Males can show high reproductive skew ***
oWhat does this mean? Some males sire MANY offspring. While others sire NONE
Females dont have high reproductive skew
SLIDE SEXUAL SELECTION:
*** KNOW DEFINTION & 2 MAIN COMPONENTS
SLIDE SEXUAL SELECTION- COMPONENTS:
Intra-sexual selection : selection that results from competition between members of the same sex
for mates
oMale-male competition
oFemale-female competition (ie. Many males dying off in a group [seen in ruffed lemurs]
but usually male-male competition)
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SLIDE SEXUAL SELECTION- COMPONENTS 2:
Inter-sexual selection : selection that results from mate choice
Selection for certain traits over others
***also known as Epigamic Selection
SLIDE INTER-SEXUAL SELECTION: MATE CHOICE
Females are considered to be more selective than males when choosing mates because of their
greater parental investment
SLIDE SEXUAL COERCION:
Definition: the show (or threat) of force that makes a female more likely to mate with a male
when she is fertile, at some cost to the female ** Know how to explain & state examples
SLIDE SEXUAL COERCION (CONT.):
Forced copulation: an extreme form of sexual coercion in which an individual is forcibly mated
oIn orang-utans, forced copulation is performed by both unflanged and flanged males
SLIDE OTHER SPECIES IN WHICH FORCED COPULATION HAS BEEN OBSERVED:
Forced copulation can be considered a male mating strategy
SLIDE SEXUAL AGGRESSION IN HUMANS:
Which males are expected to use this strategy? Men unsuccessful in competition for the resources
and status need to attract and reproduce with desirable females
SLIDE MALE DOMINANCE STATUS:
High dominance rank:
oBelieved to indicate genetic quality (good genes)
o***often leads to mating success for males
oFemales also have longer life span and reproductive success with high rank
SLIDE PRIORITY OF ACCESS HYPOTHESIS:*** T/F questions
Attempts to describe which males get to mate and in what order
SLIDE PRIORITY OF ACCESS HYPOTHESIS (CONT.):
Alpha male should have priority of mating with females if female estrus periods dont overlap
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