BIOL 2804 Lecture Notes - Lecture 10: Red Queen Hypothesis, Genetic Recombination, Parental Investment
24 Dec 2019
School
Department
Course
Professor
Document Summary
Objectives: define life history and understand potential trade-offs involved in different strategies, compare and contrast r and k strategists and know what type of environmental factors might select for each. Life history: a species life history is its lifetime pattern of growth, development, and reproduction, age-specific patterns of, survival, growth, reproduction. Life histories are strategies shaped by natural selection. Investment in growth vs reproduction: few high investment offspring or many low investment offspring, sexual or asexual reproduction, single-sex or hermaphroditic, early or late onset of reproduction. Why sexually reproduce: red queen hypothesis: organisms must constantly adapt and evolve to deal with a changing environment. Reproductive tradeoffs: there is a linkage between reproductive investment, growth, and mortality, age at first reproduction, body size, etc. No strategy is perfect for all conditions: you can make a lot of offspring, or you can make strong/competitive offspring, but usually not both. Parities: semelparous, big bang reproduction single reproductive event over lifetime.
