Population Growth Flashcards

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1
Q

Birth Rate

A

number of births in a given period of time

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2
Q

Death Rate

A

number of deaths in a given period of time

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3
Q

Immigration Rate

A

individuals entering a community

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4
Q

Emigration Rate

A

individuals leaving a community

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5
Q

What do the birth, death, immigration, emigration ratios look like in a stable population?

A

B + I = D + E

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6
Q

What do the birth, death, immigration, emigration ratios look like in a growing population?

A

B + I > D + E

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7
Q

What do the birth, death, immigration, emigration ratios look like in a decreasing population?

A

B + I < D + E

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8
Q

Exponential Growth

A

growth of a population that appears to continue unchecked

shows a J-curve on a graph

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9
Q

Logistic Growth

A

growth of a population that does not grow past a certain limit

shows an S-curve

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10
Q

Carrying Capacity

A

the number of organisms in a population that the environment can maintain or “carry” with no net increase or decrease

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11
Q

Types of limiting factors

A

density-dependent and density-independent

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12
Q

density-dependent factors

A

A factor that limits a population more as the population density increases

ex) food availability, water availability, shelter

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13
Q

density-independent factors

A

Factors that limit populations but are unrelated to population size or density

ex) weather, natural disasters, flood acidity

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14
Q

What do all density-independent factors have in common?

A

they’re all abiotic

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15
Q

lag phase of growth curves

A

when the population is beginning to colonize an area

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16
Q

Population Density

A

the number of individuals of a particular species per unit of area or volume.