Lavc f10 lecture 11 primate reproductive strategies
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Anthro 101: Human Biological Evolution lecture on Primate Reproductive Strategies - Rebecca Frank @ LAVC Fall 2010
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Chewing, in which food is mixed with saliva begins the process of digestion. This produces a bolus which can be swallowed down the esophagus and into the stomach. Here it is mixed with gastric juice until it passes into the duodenum, where it is mixed with a number of enzymes produced by the pancreas. Saliva also contains a catalytic enzyme called amylase which starts to act on food in the mouth. Another digestive enzyme called lingual lipase is secreted by some of the lingual papillae on the tongue and also from serous glands in the main salivary glands. Digestion is helped by the mastication of food by the teeth and also by the muscular actions of peristalsis and segmentation contractions. Gastric juice in the stomach is essential for the continuation of digestion as is the production of mucus in the stomach.
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Lavc f10 lecture 11 primate reproductive strategies
- 1. Anthro 101: Human Biological Evolution Lecture 11: Primate Reproductive Strategies Office Drop-in Hours AHS 308 Tutoring Lab Hours AHS 232 T 5:30 - 6:30 M & T 1 - 4 Th 11:15 - 12:15, 1:15 - 3:15 Student ID required F 12 - 1:30 by appointment
- 8. What strategies do females use to enhance reproductive success? 1. Care 2. Competition 3. Cooperation
- 14. Cooperation: In marmosets and tamarins, female RS depends on helpers
- 21. Pair-bonede species: Gibbons and siamangs Males are attentive to mates Sing duets in territorial displays Females have priority of access Males help care for infants
- 24. More intense male-male competition leads to greater sexual dimorphism
- 25. Baboon males are twice as big as females
- 26. Males are well-armed for conflict
- 27. Males fight over access to receptive females
- 28. These fights can be very costly to males
- 29. High rank enhances male reproductive success Baboons
- 30. Intense male-male competition can also lead to sperm competition….and larger testes…in species where females mate promiscuously Monogamous 1- ♂, Multi-♀ Multi- ♂, Multi-♀ Observed/Expected Size 0.5 1.0 1.5 2.0
- 35. 1. Infanticide is associated with changes in male status: Males don’t kill unless they GAIN reproductive access they did not have before
- 36. 1. Males begin to kill infants soon after they join group Hanuman langurs, Borries & Koenig 2000
- 37. 2. Males kill unweaned infants Probability of surviving presence of infanticidal male Langurs Howlers 0-3 3-6 6-9 > 9 Age (mos)
- 38. 3. Males don’t kill own infants
- 40. Infanticide is a major cause of mortality % deaths due to infanticide
Editor's Notes
- Why does food matter so much to females? Why don’t they pass the buck or spend their time finding more mates like males do?
- Hi low, different estimates at different sites. All white bar = 1 estimate, All grey bar = 0 at one site higher at other site
- Preying mantis females eat their mates during sex…