Ch 6 Population Ecology Flashcards
How many organisms the enviroment can actually support
Carrying capacity
What does survivorship curve represent
Average survivorship for the specjes throughout its life span
Oysters and dandelions
High death rates for young few for adulthood
If they reach adulthood they tend to live for a log time
R selected species
Low death rates at early life and middle life
Increase death rates in older groups
K selected species
Examples of exponential growth ( j cuvee)
Most are r selected species
Doubling time remains constant
Called explosion
Examples of logistic growth
Occurs in an environment with unlimited resources
Population reproducing at maximum rate
Population growth slows down as the population reaches its carrying capacity
Carrying capacity ( k) is maximum population size
Logistic population
How do density dependent factors affect population?
Exert more pressure as population becomes larger in size generally biotic factors
Example organisms interacting with each other
Density independent
Exerts pressure regardless of the population size generally abiotoc factors
Example weather
Natural disasters
Sunlight
Practical applications for population ecology and population growth curves
Can be used to increase population of organisms we wish to harvest
Decrease populations of pests
Manage population of organisms threatened with extinction
A group of organisms of the same species living in the same general area
Population
