BSC 2011 Lecture 35: Ecology Lecture 5

• School: University of Florida
• Department: Biology - Biological Sciences
• Course: BSC 2011
• Professor: Jennie Demarco

Document Summary

Population growth: intrinsic growth rate (r)=highest possible per capita growth rate for a population, under ideal conditions populations can grow rapidly. Geometric (additive) growth model=compares population sizes at regular time intervals: adds constant number of individuals each time period. Multiplicative (exponential) growth model=population increases continuously at an exponential rate (j-shaped curve: adds constant multiple of population size (n) each time period, n(t)=n(0)ert. As population increases: r decreases, birth rate decrease, death rate increase, when r=0, population size stops changing. Carrying capacity (k: number of individuals an environment can support inde nitely. Density dependent factors-effects that increase with crowding: starvation, disease, places to live/territoriality. Tuesday, july 19, 2016: toxic waste, predators, growth models. Logistic model: used to predict change in populations when environment limits growth: population growth rate= n*reduction*rate when n close to one, r=r0*(1-n/k) K-carrying capacity: in ection point-k/2, fluctuating population cycles. Fluctuations are the rule for natural populations.