Chapter 5 Population regulation
1 Chapter 5 Population Regulation
Contents Why and how does a population change in size? Exponential vs.Logistic growth >Density independent density dependent forces 2
2 Why and how does a population change in size? ¾ Exponential vs. Logistic growth ¾ Density independent / density dependent forces Contents
Some invasive plants in China Eive-fingered Morn oomoea cairica Castooav SiescestntE pes.(Mart
3 Five-fingered Morning Glory Ipomoea cairica (L.) Sweet Water Hyacinth Eichhornia crassipes (Mart.) Solms Castorbean Ricinus communis L. Mile-a-minute Weed Mikania micrantha H.B.K. Some invasive plants in China Water hyacinth (Eichhornia crassipes)
Patterns of Population Growth All populations have a particular pattern of growth Biotic potential-The highest possible per capita rate of increase for a population The factors that determine whether the biotic potential is high or low are: 1.The usual number of offspring per reproduction 2.The chances of survival until age of reproduction 3.How often each individual reproduces 4.The age at which reproduction begins 4
4 Patterns of Population Growth All populations have a particular pattern of growth Biotic potential – The highest possible per capita rate of increase for a population The factors that determine whether the biotic potential is high or low are: 1. The usual number of offspring per reproduction 2. The chances of survival until age of reproduction 3. How often each individual reproduces 4. The age at which reproduction begins
5.1 Exponential growth-the J-shaped curve(指数增长模型，J型增长)
5 5.1 Exponential growth – the J-shaped curve（指数增长模型， J型增长）