Limiting Factors
These factors can either help a population to grow or cause it to decrease.
Limiting factors
Competition between different species.
Interspecific competition
Density-dependent
Give an example of a natural disaster that is density-independent.
Which provinces are affected by Mountain Pine Beetles?
British Columbia and Alberta
These factors do depend on population size.
Density-dependent factors
The predator population increases while the prey population decreases during this interaction.
predation
Allee effect occurs when a population is too...
Low
True of False: The effect of density-independent factors depend on the size of the population.
False
True
These factors affect populations regardless of size.
Density-independent factors
This plant captures insects due to poor soil nutrients
Venus fly trap
________________ fluctuations can also influence the growth and activities of organisms.
Temperature
When forests absorb more carbon than they release.
Carbon sink
An example of this type of factor is disease and competition.
Density-dependent factors
This factor causes increased disease spread and encourages migration when population density is high
Crowding
The number of whooping cranes left in 1941
A sudden heatwave killing insects is an example of passing this threshold.
Physiological threshold
Percentage of B.C.'s mature pine trees killed by the beetle by 2017
over 70%
Give one biotic and one abiotic example of a limiting factor.
E.g. disease (biotic) and flood (abiotic)
A disease that affects hibernating brown bats
White-nose syndrome
2 challenges low-density species such as caribou face that makes recovery difficult.
limited mating opportunities and large habitat needs
Give an example of a density-independent factor that is caused by climate change.
E.g. forest fires, reduced precipitation, droughts, storms
A dangerous loop where global warming causes beetle survival, which leads to more warming.
Positive Feedback Loop