Which statement about the Aleutian Island community is true?

Both blue diamond and yellow circle answers

In a metapopulation, habitat fragmentation generally causes the _______ rate to increase and _______ to decrease.

extinction; the colonization rate

Which of the following is not an abiotic feature of the environment?

The density of earthworms present in the soil

Which statement about populations is false?

Populations are all the species in an area that are capable of interacting.

Some Aleutian Islands have urchin barrens while others are have kelp forests. Which answer gives the primary explanation

Grazing by urchins prevents the formation of kelp forests.

Which statement does not represent an assumption of the Levins’s model of metapopulation dynamics?

The spacing of patches determines the rate patches will receive colonists.

Which statement about populations is false?

Most organisms have equal capacities for dispersal

Place a species distribution in order from smallest to largest

Population < Metapopulation < Geographic range

In a metapopulation, why does the colonization rate decrease as p becomes very large?

There are few empty patches available for colonization

Which statement about disturbances is true?

All disturbances are abiotic events.

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Chapter 9 Review

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Questions 14

Answers

1
Which statement about the Aleutian Island community is true?
Without kelp, sea urchins could not persist for long periods of time.
Both blue diamond and yellow circle answers
Otters had been hunted to near extinction, but their abundances increased
Otters eat a lot of urchins as a source of food.
2
In a metapopulation, habitat fragmentation generally causes the _______ rate to increase and _______ to decrease.
colonization; environmental stochasticity
extinction; genetic drift
colonization; the extinction rate
extinction; the colonization rate
3
Which of the following is not an abiotic feature of the environment?
The salinity of the soil
The salt content of sea mist
The amount of sunlight the soil receives
The density of earthworms present in the soil
4
Which statement about populations is false?
Populations are all the species in an area that are capable of interacting.
A group of individuals (same species) that interact with one another
Populations are dynamic entities that vary in size over time and space.
The distribution of a species is the geographic area where abundance is >0
5
Some Aleutian Islands have urchin barrens while others are have kelp forests. Which answer gives the primary explanation
Kelp forest islands & urchin barren islands differ due to oceanic currents.
Kelp eat urchins, thus preventing their establishment.
Grazing by urchins prevents the formation of kelp forests.
Kelp forest islands have warmer climate relative to urchin barren islands
6
Area-based methods often make use of sampling areas of a defined size called
GARPs
transects
quadrats
ramets
7
_______ is the seasonal roundtrip movement of populations.
Habitat dispersal
Migration
Dispersal limitation
Disturbance
8
Which statement does not represent an assumption of the Levins’s model of metapopulation dynamics?
A very large number of identical habitat patches exist
The spacing of patches determines the rate patches will receive colonists.
All patches have an equal opportunity to receive colonists
All patches have the same probability of extinction.
9
Which statement about populations is false?
Most organisms have equal capacities for dispersal
Populations are not real
Population abundances change over time and space.
Inhabited patches that are isolated spatially but ae connected by dispersal
10
Place a species distribution in order from smallest to largest
Geographic range < Population < Metapopulation
Metapopulation < Population < Geographic range
Population < Metapopulation < Geographic range
Geographic range < Metapopulation < Population
11
Which population dispersion pattern is most commonly observed while conducting field surveys?
Regular
Genet
Random
Clumped
12
There are 80 sparrows in a 20 hectare area. The average population density of sparrows at this site is _______/hectare
4
20
160
80
13
In a metapopulation, why does the colonization rate decrease as p becomes very large?
Patches are exactly the same
Patches are far away from each other.
Extinction rates are higher.
There are few empty patches available for colonization
14
Which statement about disturbances is true?
Disturbances are only important in hurricane zones.
All disturbances are abiotic events.
All biotic events are disturbances
All abiotic events are disturbances

Chapter 9 Review Flashcards | StudBud