Population Size Flashcards
Population
all members of one species that live together in the same habitat
What is population affected by
biotic and abiotic factors
Limiting factors in population
food water shelter weather/climate temperature
What are the different effects of limiting factors
tolerance range
carrying capacity
competitive exclusion
Tolerance range
range of abiotic factors an organism can tolerate
Carrying capacity
total number of organisms that can be supported by an ecosystem
Competitive exclusion
prevents the overall population of an ecosystem from becoming too large
Human impact on population size
habitat destruction of rainforests and wetlands
How are we protecting natural habitats
remediation
wildlife refuge creation
wetland conservation
Factors determining population size
birth/death rate animal migration immigration/emigration available niches resource supply
Birth rate
number of births that occur in relation to the overall population
Death rate
number of deaths that occur in relation to the overall population per year
Growth rate
birth rate-death rate
R-selected species
short life span
produce large number of offspring in a short period of time
Examples of R-selected species
algae and fruitflies
K-selected species
long life span
produce few offspring
Examples of K-selected species
elephants, giant tortoise
Migration
seasonal movement of organisms between locations
Migration occurs due to
change in food or water supply
change in climate
reproduction
Immigration/emigration
permanent movement of organisms from a native location to a foreign location
Age structure
distribution of age groups within a population
Population distribution
how an where organisms are located
can be even, clumped, or random distribution
Population density
amount of organisms per unit of an area
Population size
number of members of a species in a given population
About …… of species in Madagascar are only found there
75%
Unique populaitons of organisms in Madgascar
Aye Aye
Fossa
