ecology

Home

Get App

Create

population

group of individuals all of the same species living in the same area
community

group of populations living in the same area
ecosystem

interrelationships between the organism in a community and their physical environment
biosphere

all the regions of the earth that contain living things.
habitat
- where an organism usually lives
- may include physical and chemical environment
niche
- all the biotic (living) and abiotic (nonliving) resources in the environment used by an organism
- certain resources being consumed or certain qualities of life are changed in some way by the presence of the organism
population ecology

study of the growth, abundance, and distribution of populations
size
- represented by N
- total number of individuals in a population
density

total number of individuals per area or volume occupied
dispersion
- how individuals in a population are distributed
- may be: clumped, random, uniform
age structure
- abundance of individuals of each age
- horizontal:expresses the frequency of individuals in an age group
- vertical line:divides each age group into males and females
- rapid growing:large portion of the population is young (pyramid shaped)
- when tiers are equal=zero (stable) population growth
survivorship curve

how mortality of individuals in a species varies during their lifetimes
Type I (survivorship curve)

species in which most individuals survive to middle age. after that age, mortality is high
Type II (survivorship curve)
- length of the survivorship is random
- likelihood of death is the same at any age
Type III (survivorship curve)
- most individuals die young
- few survive to reproductive age or beyond
- ex: oysters, plankton

Author

Anonymous

26863

Card Set

ecology

Description

ecology

Updated

2010-07-15T08:23:50Z

Show Answers