Population Regulation Flashcards

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1
Q

Density Dependent

A

Have greater affect when the population is denser and less affect when the population is less dense.

  • Competition for resource (water and food)
  • Shelter (to hide/reproduce)
  • Predation- population is large and dense therefore more interaction and contact and high level predators
  • Disease- more interaction and contact. Organisms that live in close proximity (diseases spread quicker).
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2
Q

Density Independent

A

May affect all individuals in a population equally but some members of the population may be better able to adjust to them.
Physical Factors- rainfall, temperature, humidity, acidity and salinity
Catastrophic Events- flood, fire ,drought, volcanic eruption, tsunami, earthquake

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3
Q

Environmental limiting factors

A

Any factor that limits the growth of a population (inhibits population growth).

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4
Q

Biotic potential

A

Number of offspring capable of being produced by individuals of a species.

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5
Q

Carrying capacity

A

The total population able to be supported by a particular environment.

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6
Q

Negative Feedback

A

A change which reverses a particular trend. Sets in motion reverse processes.

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7
Q

Rate of increase or decrease of a population

A
r=(b+i)-(d+e) 
b= births
i= immigrants 
e= emigrants 
d= deaths
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8
Q

Density dependent/independent

A

They influence the individuals ability to reproduce. (Natality/ birthrate is affected).
Can cause ill health or death. (Increases mortality/ death rate).

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9
Q

Population growth

A

The difference immigration and emigration.
A population in equilibrium B, D, E, I balance out and there is not net change in the population abundance. When losses exceed gains, the population declines.

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10
Q

Population equilibrium
A declining population
An increasing population
Rate of population change

A
Population equilibrium B+I=D+E
A declining population D+E> B+I
An increasing population B+I > D+E
Rate of population change= 
B rate- D rate + net migration rate (positive or negative)
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11
Q

What is a population?

A

A population consists of all organisms of a given species that live in a particular area.

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12
Q

What are two important measures of a population?

A

Population size- the number of individuals

Population Density- the number of individuals per unit area or volume.

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13
Q

Density Equation

A

(total number of species)/(sample area)

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14
Q

Abundance Equation

A

total area x density

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