Evs Chapter 7

Front 1

age distribution

Back 1

the comparative percentages of different age groups within a populaton

Front 2

biotic potential

Back 2

the inherent reproductive capacity

Front 3

birthrate

Back 3

the number of individuals born per thousand individuals in the population per year

Front 4

carrying capacity

Back 4

the optimum number of individuals of a species that can be supported in an area over an extended period of time

Front 5

deathphase

Back 5

the portion of the population growth curve of some organisms that show the population declining

Front 6

death rate

Back 6

the number of death per thousand individuals in the population per year

Front 7

density dependant limiting factors

Back 7

those limiting facts that become more sever as the suze of the population increases

Front 8

density independent limiting factors

Back 8

those limiting factors that are not affected by population size

Front 9

dispersal

Back 9

migration of organisms from a concentrated population into areas with lower population densities

Front 10

emigration

Back 10

movement out of an area that was once one's place of residence

Front 11

environmental resistance

Back 11

the combination of all environmental influences that tend to keep populations stable

Front 12

exponential growth phase

Back 12

the period during population growth when the population increases at an ever-increasing rate

Front 13

immigration

Back 13

movement into an area where one has not previosly resided

Front 14

K-strategists

Back 14

large organisms that have relatively long lives, produce few offspring, provide care for their offspring, and typically have populations that stabilize at the carrying capacity

Front 15

lag phase

Back 15

the initial stage of population growth during which growth occurs very slowly

Front 16

limiting factor

Back 16

the one primary condition of the environment that determines population size of an organism

Front 17

mortality

Back 17

the number of deaths per year

Front 18

natality

Back 18

the number of individuals added to the population through reproduction

Front 19

population density

Back 19

a measure of how close organisms are to one another, generall expressed as the number of organisms per unit area

Front 20

r-strategists

Back 20

typically, a small organism that has a short life span, produces a large number of offspring,and does not reach a carrying capacity

Front 21

sex ratio

Back 21

comparison between the number of males and females in a population

Front 22

stable equilibrium phase

Back 22

the phase in a population growth curve in which th4e death rate and birthrate become equal