BIOLOGY 152 Lecture Notes - Lecture 33: Logistic Function, Species Richness, Organism
Document Summary
Real-world and lab populations follow a logistic growth pattern. Especially in periods after populations have been reduced. Often, the logistic growth pattern does not fit real-world problems: it needs to be expanded. The females are producing their young, and so many young are released at once that the population reaches above the carrying capacity. There were plenty of resources at the time of conception, but after birth, the population overwhelms the fixed amount of resources. At overshoot, death rate increases and birth rate decreases. Time lag in the signal reading that organisms can read: they have many resources during conception, but do not predict that there will be too little in the future: ex. Song sparrow: the dynamic goes from high to low to high, etc. In nature, k is not constant: the absence of predators/pathogens/resources. What limits population growth? (by affecting birth rate and/or death rate)
