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biology yr 13 > variation in population size > Flashcards

variation in population size Flashcards

1
Q

why does population size vary

A

due to abiotic and biotic factors as well as intra and inter species compertion

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2
Q

what are the three factors in population dynamics

A

size
density
dispersion

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3
Q

what is a contributing factor in size

A

growth rate

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4
Q

what is groeth rate

A

birth rate - death rate

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5
Q

what are factors effecting density

A

immigration and emmigration

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6
Q

define immigaration

A

individuals movement into a population

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7
Q

define emmigration

A

individuals movement out of a population

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8
Q

what is dispersion

A

the moving out of an area

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9
Q

what other factors effect density

A

dependent factors
independent factors

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10
Q

what are density dependent factors

A

biotic factors in environment that have an increasing effect as pop size increased

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11
Q

what are density independent factors

A

abiotic factors in the environment that effect population regardless of their density

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12
Q

how is variation in population size measured

A

on a population growth culture

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13
Q

what is the first stage in population growth culture

A

lag pahse

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14
Q

what is the lag phase

A

a slow rate of growth due to low number of organisms meaning their is a lower reproduction rate

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15
Q

what comes after the lag phase

A

log phase

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16
Q

what is the log phase

A

rapid growth

17
Q

why is their rapid growth in the log phase

A

greater reproductive rate as their is an unlimited resource
br higher than dr

18
Q

what comes after log phase

A

stable phase

19
Q

why does the stable phse occour

A

as it reaches carrying capacity

20
Q

define carrying capacity

A

maximum number of sustainable organisms in the habitat

21
Q

how does this stable phase occour

A

br=dr

22
Q

what can occour during the stable phase

A

small fluctuations

23
Q

what are these small fluctuations due to

A

changes in resources

24
Q

what comes after the stable phase

A

death

25
Q

what is thew death phase

A

rapid decrease due to dr being greater than br

26
Q

why is there a greater br to dr

A

resources running low and changes in biotic and abiotic factors meaning there is little to no resources

27
Q

what are the two lif histroy patterns

A

stratigists who live a short life span with a small body size and high reproductive rate, compared to those who live a long life span, have a larger body size and reproduce more slowly

biology yr 13 (40 decks)

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