Population Ecology Flashcards
What is the variable “r” in Population Ecology?
“R” is the intristic rate of natural increases in a population.
True or False: Populations grow in Linear growth?
False. Exponential Growth.
“R” = _________+_____________
“R” = birth rate+ death rate
Is prolonged exponential growth possible? Why?
No.
Population would grow Infinitely large
Resources/Space would run out
Every environment has a carrying capacity (K)
What is “K” in Population Ecology?
The population size supported over a long period of time.
What happens if “K” is exceeded in Population Ecology?
There are not enough resources to support all individuals.
What happens if a population is less then “K” in Population Ecology?
The birth rate is high, the death rate is low.
What happens in Logistic Growth as the population is about to reach “K”?
The birth rate slows down.
What type of reproduction does r-selected species have?
Rapid Reproduction
What type of reproduction does K-selected species have?
Slow reproduction
Which type of species gives better care to their young?
K-selected species
What is survivorship?
Proportion of a population surviving to a certain age.
A Type I survivorship curve is characteristics of what type of species?
K- Selected Species
A Type II survivorship curve is characteristics of what type of species?
r-selected species
A Type III survivorship curve is characteristics of what type of species?
An intermediate of K and r selected species.
What is age structure?
The distribution of individuals among age groups in a population.
What is a density-independent factor?
Large scale environmental change.
What do density-independent factors regulate?
r-selected species
True or False: Density-Independent factors control population change
False. They cause populations to crash
What is a Density-Dependent factor?
Localized changes or behaviors experienced by organisms.
What do Density-Defendant factors regulate?
K selected species
What is symbiosis?
Organisms living with each other In the same habitat.
