Population Flashcards
(21 cards)
Define population density
of individuals per area or volume
Define population growth
Rate of speed at which change in population occurs
Define cgr
Rate of change per individual
- no need for timeframe
Define population
All organisms of the same species in same place at same time
Define community
All organisms in all populations in an area
Define ecology
Study of interactions between organisms and environment
3 types of patterns in population distribution
- Uniform
- Clumped
- Random
Where do exponential growth curves occur?
In closed populations
(Only birth and death, barely immigrate or emigrate)
Define biotic potential
Max rate that population can increase in size
What determines biotic potential?
- # of offspring per reproductive cycle
- Reproductive maturity
- Life span
- Amount of time they can reproduce in their life
Phases of logistic growth?
- Lag
- Logistic
- Stationary
What does a wide base in a histogram reveal?
Growing population
What does a narrow base on a histogram show?
Declining population
What does a rectangle on a histogram show?
Stable population
Define carrying capacity
Max # of individuals an environment can support
Define primary succession
Species exist when no life existed before (pioneer species)
Define secondary succession
Rebuilding of an areas population that used to have a stable community
(After disturbance)
Define pioneer community
Community established after disturbance
Define climax community
Stable community until NEXT disturbance
What does #O#RAL stand for?
O: Number of offspring per reproductive cycle
#R: Number of times it can reproduce in its life
A: age of reproductive maturity
L: life span
Define allelopathy
Chemical inhibits plant (secreted by another plant)
