Populations. Chapter 36. Populations. Is a groups of organisms that belong to the same species and live in a particular place at the same time. Population Ecology.
Is a groups of organisms that belong to the same species and live in a particular place at the same time.
The study of how members of a population interact with their environment, focusing on factors that influence population density and population growth.
a rotting log
Mortality rate- the number of deaths in period of time
Life Tables track survivorship in populations. Insurance companies use them for human life expectancy.
BIRTH RATE – DEATH RATE = GROWTH RATE
The rate of population increase under ideal conditions
Due to limiting factors (resources), population growth rate will level off (possible crash)
is the maximum population size that a particular environment can sustain (“carry”) with available resources.
Carrying Capacity = K.
Any factor that limits or restrains the growth of a population
BIOTIC VS ABIOTIC
Food or nutrients:
As resources are divided between more and more individuals, birth rate decreases.
Example: song female bird density vs. clutch size results in an indirect relationship.
Influences on health and survival
Search image established for most common prey
“Booms” : rapid exponential growth followed by “busts”: population falls back to a minimal level.
An individual’s chance of surviving or reproducing depends on the number of individuals