Lecture 31-Population Ecology Flashcards Preview

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Flashcards in Lecture 31-Population Ecology Deck (44):
0

What is population ecology?

The study of populations in relation to their environment

1

A group of individuals of a single species living in the same general area.

Population

2

Population ecology studies how biotic and abiotic factor influence what?

Density, distribution, size, and age structures of populations

3

The number of individuals per unit area or volume.

Population density

4

Population density is typically __________.

Estimated

5

Population dynamics deal with __________ and __________ within a population.

Addition, removal

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Addition:

Birth and immigration

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Removal:

Death and emigration

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Addition = population __________.

Influx

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Removal = population __________.

Outflux

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What is population size affected by?

Birth, death, immigration, and emigration

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Change in population size (N) during time interval (t) =

(Births + immigration) - (Deaths + emigration)

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Average # per individual.

Per capita

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Per capita birth rate equation:

B = bN

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Per capita death rate equation:

D = mN

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Per capita rate of increase equation:

r = b - m

16

Different populations exhibit different __________ __________.

Distribution patterns

17

The pattern of spacing among individuals within the boundaries of the population.

Dispersion

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3 types of dispersion?

Clumped, uniform, and random

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Aggregated in patches.

Clumped

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Evenly distributed; result of antagonistic social interactions (territoriality).

Uniform

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Position of individuals independent of others.

Random

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Most common dispersion pattern:

Clumped

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The maximum population size that a particular environment can sustain.

Carrying capacity (K)

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What can carrying capacity be shaped by?

Energy, shelter, refuge from predators, nutrient availability, water, and suitable nesting sites

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The study of vital statistics of populations and how they can change over time.

Demography

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The data used in demography is captured through:

Census, mark-and-recapture, and sampling

27

Age-specific summaries of survival patterns of populations.

Life tables

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Shows rate of survivorship for a cohort/population.

Survivorship curve

29

Describe a Type I curve.

Low death rates during early and middle life, and then curve down sharply among older age groups.

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Describe a Type III curve.

Large/massive death rates for the young, then low for those few individuals that survive.

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Describe a Type II curve.

Equal/constant death rate over the organism's life span

32

This affects the future growth of the population.

Population age structure

33

Populations of all species have the potential to expand when resources are ___________.

Abundant

34

Population increase under ideal conditions.

Exponential population growth

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An exponential population growth have what kind of exponential growth curve?

J-shaped

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Exponential population growth is characteristic of populations that are:

Introduced to a new environment

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When dealing with exponential population growth, there is no limit on __________, no __________, and no __________.

Resources, competition, and predators

38

What limits population growth?

Carrying capacity

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Levels off as population size approaches carrying capacity.

Logistic population growth

40

Traits that affect an organism's schedule of reproduction and survival.

Life history

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Examples of traits that affect an organism's schedule of reproduction and survival:

When reproduction begins, how often an organism reproduces, and how many offspring are produced

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There is a __________ between reproduction and survival.

Trade-off

43

Interaction among organisms affects:

Population size fluctuation