Psc 101 Final SG

Psc 101 Final SG - PSC 101 NOTES LECTURE 1 • Themes o...

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Unformatted text preview: PSC 101 NOTES LECTURE 1 • Themes o Biological systems organized at multiple levels o Explore reproductive and social behavior from this perspective (individual and social system) • Mating systems o Much variation across species in form o Classification: based on number of mates per individual Monogamy – 1M, 1F Polygamy – individuals of one sex mate with multiple individuals of another sex • More diverse than monogamy • Subdivided – polygyny; polyandry o Polygamy Polygyny • 1M, multiple females – more diverse • Where resources/mates are economically defendable o Economic defendability (Brown; Emlen & Oring) Resource defense: e.g. wildebeest (F live in small groups w/ other F roaming. Spend more time in territory of the M who has more resources and therefore more likely to reproduce with those M) Female defense: e.g. sea lions (video) o Where neither resources nor mates are economically defendable: male dominance (includes leks, e.g. black grouse – video) Lek: a traditional mating ground • M defend small “symbolic” territories o F don’t live here... no resources, etc. • F “shop” for mates then rear young on their own Polyandry PSC 101 NOTES • 1F, multiple M • More rare than polygyny • Ex: wattled jacana (leaf trotters) – video o M rear offspring. Don’t see evidence of grief w/ loss of reproductive partner like you would in a normal monogamous relationship o Mate choice M may no have option of mating w/ 1 + F cuz F choose only unmated M as mates (could block polygyny) o Intrasexual competition F may not have option of mating w/ 1 + M cuz her existing mate keeps other M away (could block polyandry) o Potential role of M in care of offspring Polygyny more likely where that potential is low (e.g. mammals) Monogamy more likely where that potential is high (e.g. birds) Mediated by F mate choice • F sustain little cost when they share a relatively unlimited resource like a M sperm • Higher cost when they share a limited resource like parental care Conversely, the type of mating system also shapes the individuals behavior and morphology • In part through sexual selection (i.e. mating system individual behavior) • Two-Way interplay between levels o Mating systems (higher level of organization cuz made of individuals) were clearly created by the behavior of individuals • Sexual selection o Darwin created the concept of sexual selection in addition to natural selection It is now viewed as a subcategory of natural selection • Both are ultimate, i.e. evolutionary processes o 2 components: Within-sex competition for mating opportunities PSC 101 NOTES • This proximate process generates the ult imate process of intra sexual selection Selectivity in choice of mates • This proximate process generates the ultimate process of inter sexual selection • Mating systems o Monogamy and polygyny differ strongly in their implications for both mate choice and intrasexual...
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This test prep was uploaded on 04/14/2008 for the course PSC 101 taught by Professor Owings,coss,henry during the Fall '07 term at UC Davis.

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Psc 101 Final SG - PSC 101 NOTES LECTURE 1 • Themes o...

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