1. Biology
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the same time

2. Ch Populations
Biotic Potential- the highest rate of reproduction for a population under ideal conditions
Limiting Factors- prevent a population from reaching it’s biotic potential
Ex: disease, predation, food supply, space, seasonal changes

3. Population Size- All members of the same species living in the same place at the same time
Species- Any group of organisms that are able to reproduce and produce fertile offspring
Birthrate- # of organisms born in a period of time, usually expressed as the number of births each year for every 1000 people

4. Population Growth Curves
Two Types : (Named after their shape)
“ J” Shape “S” Shape
* ideal conditions *limited by limiting factors
* no limiting factors *prevent organism from
This population is able to reach reaching biotic potential
It’s biotic potential = highest rate carrying capacity = greatest
of reproducttion under ideal # of individuals that an
conditions environment can support at
a given time.

5. Carrying Capacity- the greatest # of individuals in a population supportable by the environment and local resources
- population size tends to level off at a certain point due to limiting factors
Population Density- the size of a population occupying a specific area
Ex: Dense Population- NYC, beehive
Sparse Population- Tolland, meadow

6. Regulation of Population Size
Both population density and environmental factors can limit population size
Density Dependent Factors: limit population size based on population density/size
ex- space, food supply, predation(predators vs. prey)
Density Independent Factors: do not depend on population density
ex- seasonal changes, temperature, environmental factors, natural disasters

7. Limiting Factors
Predation- One organism feeding on another(prey) for food
- The size of predator and prey populations keep each other in check
Parasitism- a parasite usually harms its host but does not kill it, why?
Disease- disease limits population size by eliminating susceptible individuals
Competition- between different species(interspecific)
or between members of the same species(intraspecific)

8. Ecology- the study of living things and their environment
Symbiosis- the interaction of 2 different species of organism
Mutualism- both organisms benefit from the relationship
Commensalism- one organism benefits the other is unharmed
Parasitism- one organism benefits and the other is harmed

9. Graphing Growth Curves
Density Dependent
Ex: Yeast Growth
Time Population Size
0 10
2 29
4 71
641
Density Independent
Ex: Moth Population Size
Month Population Size
Jan 12
Feb 20
Mar 45
Apr 98
May 176
Jun 257
Jul 212
Aug 221
Sept 265
Oct 168
Nov 89
Dec 52