Exam 2 Flashcards
(20 cards)
Polygyny threshold model
When a female picks a male based on territory (less shade vs more shade)
Lek
When multiple males gather together to perform for female attention
Residual reproductive value
Expected future reproductive output of an individual or the amount of reproductive potential remaining in their life
Facultative siblicide
Siblings kills under certain conditions
When and why do lions ( and monkeys) engage in infanticide
When a new male takes over a group to eliminate potential competitors and increase new males reproductive success
Runaway selection
Theory to explain how traits that have little to no survival advantage become exaggerated due to female mate preference, leads to positive feedback loop
What is the Hamilton-Zuk hypothesis? Provide an example (real or hypothetical). Is this idea compatible with a sexy
son hypothesis or mutually exclusive? Justify your answer.
The hypothesis suggest that sexual signals are indicators of an individuals resistance to parasite or disease. Ex. in peacocks males with vibrant tails are often healthier and more resistant making them more attractive to females. This idea is compatible with a sexy son hypothesis.
Intersexual
Is when there is mate choice between sexes (one sec chooses mates based on desirable traits)
Intrasexual
Is competition within the same sex (male vs male would result in a big size difference between males and females)
ESS
Is an evolutionarily stable strategy. A strategy that when adopted by most members of a population can’t be replaced or invaded by other strategies through natural selection
Mate-choice copying
Females may have limited time and experience
Sexual imprinting
Learning from early experience affecting choice Ex. brown headed cowbirds
Monogamy
Bi-parental care, long term monogamy is husband and wife (mating for life)
Polygyny
Males mate with multiple females. Females choose mates based on favorable conditions that outweighs the cost of sharing a mate Ex. territory/shade and elephant seals
Polyandry
Females mate with multiple mates and males can contribute in caring for the offspring. This increases genetics diversity and survival rate.
Promiscuity
no parental investment by males (or both sexes)
Polygynandry
Multiple pair bonds with parental investment
Sperm competition
Sensitive to male mating order and cryptic female choice
Reciprocal altruism
An individual acts in a way that benefits another, incurring a cost to themselves
Byproduct mutualism
Organisms cooperate because it benefits them individually
