Biodiversity Flashcards
Limiting factor
Aspects of the environment which restrict population size
Biotic factors and examples
Living organisms which restrict population growth
Predators, parasitism, competition for food
Abiotic factors and examples
Non living features of the environment that restrict population growth
Sunlight
Temperature
Lag phase
When only a few individuals of a species are present initially, thereby making the rate of growth of the population very slow
Exponential phase
When the population grows rapidly at its maximum rate due to more species being able to give birth
Carrying capacity
Maximum population size that can be sustained over a period of time
What does carrying capacity depend on
The availability of resources
Stationary phase
When there is a slow growth of population. It could be due to competition or the carrying capacity might be reached.
Here the death rate and birth rate are balanced, so they’re at an equilibrium
Environment resistance
Part of the environment that prevents the growth of a population
Five examples of environmental resistance
Predation
Parasitism
Climate
Disease
competition for food
Factors that check population size
Density dependent factors
Density independent factors
Density dependent factors
Density independent factors
Which of these two tend to be either biotic or abiotic
These factors depend on the population size. Tends to be biotic
Factors that do not depend on the population size . Tends to be abiotic
What effect does density dependent and Independent factors have on the population
Density dependent factors slow down the population while density independent factors can lead to a population crash
Decline or death phase
When Death rate is greater than reproduction rate
What do we mean when we say populations and ecosystems are dynamic
That They are constantly changing
