Bio171-F08-lec14 - Lecture 14: Friday, October 3, 2008...

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Unformatted text preview: Lecture 14: Friday, October 3, 2008 Biology 171 Todays Topic: Behavioral Ecology: Reproduction Announcements Next Week in Discussion: Human Genetic Disease Text Reading: Lec 14: 2 nd ed: Chapter 51 (1166-1190) 3 rd ed: Chapter 51 (1149-1170) Lec 15: 2 nd ed: Chapter 52 (1192-1211) 3 rd ed: Chapter 52 (1173-1193) Optimal Foraging, Crows & Honey Bees Bird Migration (concluded) Anisogamy Mating Systems Social Acts and Altruism Kin Selection and Eusociality Optimal Foraging, Crows & Honey Bees Bird Migration (concluded from previous lecture) Reproductive Behaviors Gametes have dual functions, centered on motility and energy reserves for development. This is reFected in the evolution of ANISOGAMY, the formation of 2 spet gamete types: sperm (motility) & eggs (energy reserves) Sea Urchin ertilization Individually, sperm cells are much cheaper to produce than eggs* and this dichotomy underlies much of gender-speciFc mating behaviors. *Eggs are typically > 85,000x larger than sperm! 4 Basic Types of Mating Systems: Promiscuous, Monogamous, Polygynous & Polyandrous Promiscuous A type of relationship in which mating occurs with no strong pairbonds or lasting relationships. Sea urchins, release sperm and eggs en masse into the water column where fertilization occurs: Broadcast Spawning Monogamous A type of relationship in which one male mates with just one female. Polyandry ( many husbands ) A polygamous mating system involving one female and many males....
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Bio171-F08-lec14 - Lecture 14: Friday, October 3, 2008...

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