Variation in Population Size (AQA A-Level Biology): Flashcards
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Definition of population
Definition of population
All organisms of same species in a habitat at same time
Meaning of 'dynamic' for populations
Meaning of 'dynamic' for populations
Constantly changing in size and composition over time
Why use logarithmic scales for population graphs
Why use logarithmic scales for population graphs
To clearly show rapid growth on same graph
Definition of limiting factors
Definition of limiting factors
Factors that restrict population growth
Definition of carrying capacity
Definition of carrying capacity
Maximum sustainable population size an environment can support
Is carrying capacity a fixed number?
Is carrying capacity a fixed number?
No, it changes with conditions, resources, and seasonal factors
Definition of abiotic factors
Definition of abiotic factors
Non-living environmental conditions affecting populations
Definition of optimum temperature range
Definition of optimum temperature range
Temperature range where a species performs most effectively
4 ways temperature affects population size
4 ways temperature affects population size
Metabolic rates, reproductive success, food availability, survival rates
Why populations can't grow indefinitely
Why populations can't grow indefinitely
Environmental factors eventually limit expansion