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

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