BI210 Chapter 11 Exam Questions with Complete solutions

Allee effect - Answers-a decrease in the population growth rate as the population density decreases Bottom up control - Answers-Limitation of the abundance of a population by nutrient supply or by the availability of food. Damped oscillations - Answers-A pattern of population fluctuations in which the extent to which the population rises and falls in abundance gradually become smaller over time. delayed density dependence - Answers-Delays in the effect of population density on population size that can contribute to population fluctuations. demographic stochasticity - Answers-Chance events associated with whether individuals survive or reproduce. Environmental stochasticity - Answers-erratic or unpredictable changes in the environment natural catastrophe - Answers-An extreme environmental event such as a flood, severe windstorm, or outbreak of disease that can eliminate or drastically reduce the sizes of populations. rescue effect - Answers-A tendency for high rates of immigration to protect a population from extinction. Jump dispersal - Answers-A long-distance dispersal event by which a species colonizes a new geographic region. Top-down control - Answers-Limitation of the abundance of a population by consumers. Eutrophication - Answers-a change in the nutrient supply status of an ecosystem from nutrient poor to nutrient rich habitat fragmentation - Answers-The breaking up of once continuous habitat into a complex pattern of spatially isolated habitat patches amid a matrix of human-dominated landscape. inbreeding - Answers-mating between related individuals