unit 7 concept 3 Flashcards
(23 cards)
Population
a group of organisms living in the same place at the same time
population density
number of individuals in a defined space
population density is affected by (4)
immigration
emigration
mortality
natality
survivorship curves
geographic representation of mortality patterns
Type 1 survivorship curve
Draw
late loss; heavy parental care
Eg. humans
type 2 survivorship curve
Draw
constant loss, mortality unaffected by age
eg. birds, rodants
type 3 surviorship curve
early loss, produce lots of offspring, many die right away but live super long.
Eg. fish, mosquitos
Random population dispersion
draw
eg. seeds
uniform/even dispersion
draw
eg. teritory, sea birds
clustered dispersion
draw
eg. wolves
due to resource distribution
exponential population growth
draw
population grows without limit
eg. human
very little to no resource limitation, J shaped curve
logistic population growth
draw
grows exponential, but levels off/hovers at carrying capacity
more common
eg. rabbits
s- shape
limiting factors
Factors that limits size of the population
biotic limiting factors 2
predators, competition
abiotic limiting factors 4
sunlight, temperature, soil nutrience,, natural disasters
density dependent limiting factors 4
have a greater impact on more dense populations
compedition, predation, parasitism, disease
density independent limiting factors 3
regulate population grwoth regardless of its size or density
eg. weather changes, pollution, natural disasters
List the factors that contribute to a high population density vs. a low population density
Explain the difference between logistic and exponential population growth.
Sketch and label an example of the three types of survivorship curves. Briefly describe an example of each one.
Sketch and label a picture of the three types of dispersion patterns.
Cite specific examples of each type of limiting factor.
Classify limiting factors as density-dependent, density-independent, biotic, or abiotic.
