Ch. 35 Population Dynamics Flashcards Preview

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Flashcards in Ch. 35 Population Dynamics Deck (21):
1

Population Dynamics

Changes in population size results from various forces that control and regulate populations over time

2

Population

A group of interacting individuals belonging to one species and living in the same geographic area

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Population Density

# of individuals of a species per Area/Volume

4

Dispersion Pattern

Manner in which individuals in a population are spaced within their area

5

Clumped (Dispersion)

Individuals aggregated in patches
- results from unequal distribution of resources)

6

Uniform (Dispersion)

Individuals are evenly distributed
- results from interactions among individuals of a population

7

Random (Dispersion)

Unpredictable dispersion
- rare due to environment and social interaction
- used for testings other dispersion

8

Exponential Growth Model

A mathematical description of idealized, unregulated, population growth

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Intrinsic rate of increase

An organism inherent capacity to reproduce

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Population Limiting Factors

Environment factors that restrict population growth

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Logistics Growth Model

A mathematical description of idealized population growth that is restricted by limiting factors

12

Carrying capacity

In a population, the # of individuals an environment can sustain

13

Density - dependent Factors

A population limiting factor whose effects depend on population density
- affect more individuals as # goes up
- laboratory population, natural population

14

Density - independent Factor

A population limiting factor whose occurrence/effects are not affected by population density
- abiotic factors
- affects same number no matter the population size

15

Life Tables

A listing of survivals and deaths in a population in a particular time period and predictions of how long, on average, an individual of a given age will live

16

Life History

A series of events from birth thru reproduction to death

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Opportunistic Life History

Usually small-bodied species that reproduce young and with many. Exponential population. Unpredictable environment w/ density independent.

18

Equilibrial Life History

Large-bodied species mature later and produce few offspring but give care. Stable population size w/ near carrying capacity by density - density factors

19

How is the growth of humans affected?

Agricultural sciences replacing hunter/gatherer society results in more birth and less death. Technology allow us to continue to grow and raise the carrying capacity.
Future: Level off smoothly w/ capacity, sharp decline, or increase and mass death

20

Age Structure

Proportion of individuals in different age groups

21

Geographic shift

A change in the population's geographic range relative to a change in some environmental factor