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ecology
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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
ID
26863
Card Set
ecology
Description
ecology
Updated
2010-07-15T08:23:50Z
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