Download Notes: Populations and Carrying Capacity

Notes: Populations and Carrying Capacity
Population: group of ______________ of the same ______________ living in
the same place at the same ________________.
Carrying Capacity: The ______________ population that an
_______________ can sustain or _______________.
Example: Seychelles Paradise Flycatcher needs one acre of mixed forest per
breeding pair. They live on the little island of _______________________.
A population remains at its ________________ capacity when it’s in
________________ (number of individuals added and the number of
individuals that leave or die are the ________________)
Typical “S” graph to represent the carrying capacity of a species in a particular
ecosystem.
Factors Determining Carrying Capacity
1. Materials & Energy: energy, _____________, carbon, and other essential
______________ (_________________ Factors)
2. Food chains: the population size is limited by the size of the populations at
lower ________________ levels
3. Competition: Each organism has the same need as any other; they compete
for resources such as ____________, ___________, ____________ and
_______________
Two types of competition:
• Intraspecific competition: among members of the ________________
species
– ex: two wolves compete for a _______________
•
Interspecific competition: between _______________ species
– ex: cheetah and lion compete for _______________
4. Population Density: depending on their _____________, environment and
way of life, different _____________ have different needs for
__________________.
Density Dependent Factors
•
•
Occur when the density has gone _______________ an appropriate level
Over-population can:
– Increase ________ & lead to easier spread of ______________
and _______________
– Increases _______________ & causes parents to ____________
offspring
•
This causes the population to _____________________
Density Independent Factors
•
Limits the population- no matter what the ________________ is
(usually caused by natural disasters).
Examples:
-
Forest fires
_______________
Volcanic Eruptions
______________
Floods
Vocabulary words:
Exponential Growth
Limiting Factor
Population
Carrying Capacity
Check your understanding:
p. 290, #1 - 4