1. Natural Selection & Predator-Prey Interaction April 10, 2003 Steven J. Ehrlich

2. Today Notes and Terms Notes and Terms Game Game What to turn in: What to turn in: * Tables from pages 147-152

3. Terms Predation – When individuals eat other living individuals. Predation – When individuals eat other living individuals. Adaptation – When newly-evolved traits increase the ability of an organism to survive. Adaptation – When newly-evolved traits increase the ability of an organism to survive.

4. Terms (continued) Fitness (In Natural Selection) – A Genotype’s (or phenotype’s) reproductive contribution to subsequent generations relative to the contribution of other genotypes or phenotypes Fitness (In Natural Selection) – A Genotype’s (or phenotype’s) reproductive contribution to subsequent generations relative to the contribution of other genotypes or phenotypes

5. Terms (continued) Coevolution – The process of reciprocal evolutionary changes, involving the response of two or more populations. Coevolution – The process of reciprocal evolutionary changes, involving the response of two or more populations. Morphs – A phenotype of a species. Morphs – A phenotype of a species.

6. Natural Selection Darwin’s Theory Darwin’s Theory –Genotypes / Phenotypes –“Only the strong survive” –Predation, Adaptation, Co-evolution & Fitness

7. Natural Selection Game Description of the game – Using 3 different utensils (predators), we will pick up 4 different types of beans (prey), to see which is the most fit predator, and the most fit prey. Description of the game – Using 3 different utensils (predators), we will pick up 4 different types of beans (prey), to see which is the most fit predator, and the most fit prey.

8. Natural Selection Game (continued) The rules – The rules – –Groups –Predators/prey –2x2 meter –2 minutes –Calculations –Generations

9. Natural Selection Game (continued) Formulas used Formulas used –Handout –Fitness Formula (Predator): W i = C i /ΣC N i /ΣN N i /ΣNOr Fitness of knife = # of captures by the knife/ total # of captures # of knives / total number of predators # of knives / total number of predators

10. Natural Selection Game (continued) Fitness Formula (prey): Fitness Formula (prey): w j = e j / Σe n j / Σn n j / Σn Fitness of Pinto = # of pinto escapes / total # of escapes # of pinto beans / total # of beans # of pinto beans / total # of beans