Lab 3: Population Growth Model: Exponential Growth Flashcards Preview

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Flashcards in Lab 3: Population Growth Model: Exponential Growth Deck (24):
1

dN/dT=

rmN

2

rm= (simple)

b-d

3

Nt=

No(lambda)^t

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Nt=

No (e^rt)

5

rm= (complicated)

(lnNt-lnNo)/t

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Lamda =

e^rm

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ln lambda=

rm

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ln Nt=

lnNo +rmt

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Determinsitic:

Have fixed values therefore the outcome is fixed.

10

Stochastic:

models are formulated in terms of the probabilities of occurrence of such different events.

11

Why do populations need to overproduce in order to prevent from going extinct?

In order to recover from catastrophe's. If the population didn't reproduce to replace itself, or just replaced it self they would go extinct.

12

Biotic Potential:

the ability of a species to produce more offspring than are neccesary to replace the existing population. This define the maximum rate at which a population can grow. (rm).

13

4 factors of female life history which determine rm are:

1.) The length of time a female reproduces
2.) female age specific survivorship
3.) female birth per female per reproduction.
4.) delay of reproduction (generation time T)

14

Nt:

population size at time (t) units: indiviuals

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No:

original population size in unit of individuals

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t:

time during which population is growing

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rm:

intrinsic rate of increase (units: individuals/individual/time)

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r:

relaized intrinsic rate of increase at a particular point in time.

19

e:

base of natural log

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lambda:

finite rate of increase or multiplication rate (units: time)

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b:

birth rate

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d:

death rate

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What slows exponential growth?

intraspecific competition

24

Theory of natural selection: Darwin:

1.) There is overproduction of organisms.
2.) But population size remains more or less constant (i.e logistic growth)
3.) Thus there must be a struggle for existence
4.) Individuals in a population vary in their characteristics and these variations are inherited (at least partially) by their offspring
5.) On average types that vary most strongly in the direction favored by the environment will survive and reproduce better than less favored variants. Thus favorable variation will slowly accumulate in a population by means of natural selection.
6.) Consequently the population slowly adapts to its environment.