Lecture 10: Age Structure Human Population Growth Flashcards
Mechanism: Terrirotiality
can limit population density when individuls compete for limited space
Mechanism: Intrinsic Factors
for some populations intrinsic (physiological) factor appear to regulate population size
Toxic Wastes
accumulation of toxic wastes can contribute to density-dependent regulation of population size.
As N approaches K the death rate ___
tends to increase (carrying capacity levels out)
What caused a dip in human population in Europe in the 1340s
The Plague
Why is the population increasing and death rates decreasing?
Improvements in agriculture and better living conditions result in our larger populations and increased life expectancy
Recently has population growth been increasing exponentially?
No, it is still increasing but not as rapidly as before.
Why is there a dip in the percent increase of population growth in the 1960s?
There was a famine in China in which 60 million people died.
How do we maintain population stability
A regional human population can exist with
zero population growth=
high birth rate - high death rate
zero population growth=
low birth rate - low death rate
Demographic transition moves from..
high birth and death rates to low birth and death rates
- associated with higher quality of health care and improved access to education, especially for women
Infant mortality is lower in ___ countries but higher in ____ countries
industrializzed, less industrialized
What is the age structure
An important factor affecting a populations growth which is the relative number of individuals of each age in a population, the diagrams help us show population growth trends
What are the six mechanisms of density dependent population regulation
competition for resources
territoriality
disease
predation
intrinsic factors
toxic wastes
Mechanism: Competition for Resources
Birth rate goes down, increasing population density intensifies competition for resources
Mechanism: Disease
Mechanism for pathogens spreading rapidly in dense populations
