Ch. 56 BIO Final
Card Set Information
Ch. 56 BIO Final
56 BIO Final
The number of individuals per unit area or volume (extremely hard to determine)
The pattern of spacing among individuals within the boundaries of the population
Individuals aggregate in patches- influenced by resources availability and behavior (most common)
Individuals are evenly spaced- influenced by social interactions such as territoriality
The position of each individual is independent of other individuals (least common)
The study of birth rates, death rates, age distributions, and the sizes of populations (how births and deaths change population sizes over time)
An age-specific summary of the survival pattern of a population- best constructed by following the fate of a cohort from birth until they are dead
A group of individuals of the same age
A graphical plot of the numbers of surviving individuals at each age in a population
What is the maximum population size that a particular environment can support?
Carrying capacity (K)
How does carrying capacity affect population growth?
When N=K, the population stops growing
What is the population increase under legalized conditions- results in a J-shaped curve- cannot be sustained
What includes the carrying capacity- results in an S-shaped curve- fits few real populations but it is useful for estimating population growth
What calculates the total productive land needed for each person to survive in a sustainable world?
Ecological footprint concept
The average ecological footprint for everyone on planet Earth is currently 3 what?
The current ecological footprint for a person in the US is 10 what?
How do density-dependent factors regulate population growth?
Morality factor whose influence increases with the density of the population
ex. predation, parasitism, disease, and competition
What are density independent factors?
Morality factors whose influence is not affected by population size or density
ex. weather, drought, floods, fires
What do age-structure pyramids show us about current and future population growth?
The show us where the most people are at different ages (relative number of individuals of each defined age group)