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Bio 1306 Exam 1 > Chapter 53 > Flashcards

Chapter 53 Flashcards

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Biology 101 flashcards
1
Q

What adds to populations?

A

Births and immigration

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2
Q

What patterns can populations fall into?

A

Stable, irregular fluctuation or rising and falling

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3
Q

What causes populations to decline?

A

Deaths and emigration

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4
Q

What is a population?

A

Single species together in an area

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5
Q

What is population densitu?

A

Number of counted organisms/area

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6
Q

What is dispersion?

A

Spacing

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7
Q

What is demography?

A

Vital statistics, death and birth rates

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8
Q

What is the mark recapture method?

A

A way to estimate how many organisms are in an area- tag sample, recapture 2nd sample. Number of marked gives you idea of how many in the population are in

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9
Q

What is clumped dispersion? When does this typically happen?

A

Patches of organisms, uneven distribution of resources and high priority for social interactions

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10
Q

What is uniform dispersion? When does this typically happen?

A

Even distribution, eg plants, animals repelling each other (territoriality)

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11
Q

What is random distribution?

A

Random spread

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12
Q

What are life tables?

A

Tables that look at groups of living organisms over their lives, measuring lifespan

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13
Q

What do type 1 organisms usually die from?

A

Old age

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14
Q

What do type 2 organisms usually die from?

A

Random causes

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15
Q

What do type 3 organisms usually die from?

A

most die young, but survive after a certain point

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16
Q

When does growth tend to be exponenetial?

A

Ideal conditions (ADD MORE?)

17
Q

What is K/Carrying capacity? What does this depend on?

A

Maximum number of of individuals the environment can support, resources

18
Q

dn/dt (or delta n/delta t) =

A

rN (intrinsic rate of increase times population size

19
Q

How do the exponential curves appear as they near K/carrying capacity?

A

Growth declines, curve flattens

20
Q

Do all species fit carrying capacity exponential curve?

A

No

21
Q

What are life history traits?

A

Traits that affect the schedule of reproduction

22
Q

What are some examples of life history traits?

A

Age at first reproduction, frequency of reproduciton, number of offspring

23
Q

What is semelparity?

A

Only reproducing once in a lifetime

24
Q

What is Iteroparity?

A

Reproducing more than once in a lifetime

25
Q

Are there trade offs between survival and reproduction? If so, what’s an example?

A

Yes- more offspring with less care, or fewer offspring with care?

26
Q

What is the R-K clase?

A

Density independent (max reproduction) vs density dependent (minimum reproduction) ADD MORE DETAIL ABOUT WHAT THIS MEANS

27
Q

What are some density dependent factors?

A

Disease, intrinsic factores

28
Q

What are some density independent factors?

A

Drought, natural disaster, fire

29
Q

Are population dynamics always predictable?

A

No

30
Q

What are metapopulations?

A

Populations that are close to each other and can replace each other if one goes extinct

31
Q

What are human’s carrying capacuty? What is our growth pattern like?

A

Unknown, not exponential anymore

Bio 1306 Exam 1 (5 decks)

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