Unit 3 - Populations Flashcards
What is exponential growth?
J shaped graph
populations are not limited by resources
What is logistical growth?
S shaped
Populations are capped by a limiting resource
Growth rates get smaller towards the carrying capacity
What is a carrying capacity?
The capacity or cap of organisms that an ecosystem can support
Is determined by limiting factors
What are density dependent limiting factors?
Factors that impact a population due to its density:
-disease/parasites
-competition
-predation
What are density independent limiting factors?
Factors that can impact a population regardless of its density
-habitat destruction
-natural disasters
-human activity
What is the equation for population density?
Population/Area
What is the equation for percent change?
((EA-SA)/SA)) x100
*Ending Amount
*Starting Amount
What is the equation for growth rate?
(CBR-CDR)/10
*Crude Birth/Death Rate
What is the equation for doubling time?
Rule of 70
70/r
*Rate of Growth
What are the characteristics of a k-selected species?
K=Kopter parents
-large
-few offspring
-helicopter parents
-reach sexual maturity after many years
-long lifespan
-reproduce multiple times
-high resource competition
What are the characteristics of an r-selected species?
-small
-many offspring
-chill parents
-reach sexual maturity early in life
-short lifespan
-reproduce once
-low resource competition
What is a survivorship curve?
A line that displays the survival rates of a cohort in a population
Which survivorship curve has a low death rate where many individuals live to old age?
1
Which survivorship curve has a high death rate where many individuals die young, and few live to old age?
3
Which survivorship curve has a moderate death rate where individuals die at all ages?
2
