# Shared Flashcard Set

## Details

Biology Exam - Ch.36
Terms and Essay Questions
11
Biology
Undergraduate 2
05/11/2010

## Cards Return to Set Details

Term
 Population ecology
Definition
 The study of ow members of a population interact with their environment, focusing on factors that influence population density and growth.
Term
 Population
Definition
 A group of individuals belonging to one species and living in the same geographic area.
Term
 Population density
Definition
 The number of individuals of a species per unit area or volume
Term
 Exponential growth
Definition
 A mathematical description of idealized, unregulated population growth.
Term
 Logistic growth
Definition
 A mathematical description of idealized population growth that is restricted by limiting factors.
Term
 Carrying capacity
Definition
 In a population, the number of individuals that an environment can sustain
Term
 Limiting factors
Definition
 Environmental factors that restrict population growth.
Term
 Density-dependent factors
Definition
 Referring to a decline in birth rates or a rise in death rates in response to an increase in the number of individuals living in a designated area.
Term
 Boom and bust cycle
Definition
 caused by seasons caused by a disruption in natural checks and balances (predation)
Term
 Describe the exponential and logistic growth patterns and use an example.
Definition
 The exponential growth model is a mathematical description of idealized, unregulated population growth, while the logistic growth model is a description of idealed population growth that is restricted by limited factors. According the exponential, even elephants, the slowest breeders on the planet, would increase exponentially if enough resources were available. The logistic growth model predicts that if a population is high, there might be less food available per indiv or fewer breeding territories. These limiting factors cause the birth rate to decrease, the death rate to increase, or both.
Term
 Explain how density-dependent and density-independent factors influence populations; use examples.
Definition
 Density-independent factors, usually these are environmental disasters, such as a forest fire, tidal wave etc that destroy the natural ecosystem that a species survives in affect the same proportion of individuals in a population regardless of population density. In contrast, the effects of density-dependent factors intensify as the population increases in size. These types of factors are a direct result of a species' population size. Usually these factors arise because the populations of the species have to compete for the same resources in a limited geographical niche.
Supporting users have an ad free experience!