Question 1

The presence of cleaner wrasse enhances diversity of fishes on coral reefs.

Accepted Answer

A) True 
 B)False

Question 2

What would be the most likely effect of removing the blue tit from the Phragmites australis ecosystem?

Accepted Answer

A)  An increase in the populations of Aprostocetus gratus and Platygaster cf. quadrifarius and a decrease in the number of small Giraudiella inclusa gall clusters 
B)  An increase in the populations of Aprostocetus orithyia, Eudecatoma stagnalis, Eurytoma crassinervis, and Platygaster szelenyii and a decrease in the number of small and large Giraudiella inclusa gall clusters 
C)  A decrease in the populations of Aprostocetus calamarius and Torymus arundinis and a decrease in the number of large Giraudiella inclusa gall clusters 
D)  An increase in the populations of Aprostocetus calamarius and Torymus arundinis and an increase in the number of large Giraudiella inclusa gall clusters 
A)  An increase in the populations of Aprostocetus gratus and Platygaster cf. quadrifarius and a decrease in the number of small Giraudiella inclusa gall clusters 
B)  An increase in the populations of Aprostocetus orithyia, Eudecatoma stagnalis, Eurytoma crassinervis, and Platygaster szelenyii and a decrease in the number of small and large Giraudiella inclusa gall clusters 
C)  A decrease in the populations of Aprostocetus calamarius and Torymus arundinis and a decrease in the number of large Giraudiella inclusa gall clusters 
D)  An increase in the populations of Aprostocetus calamarius and Torymus arundinis and an increase in the number of large Giraudiella inclusa gall clusters

Question 3

Invasive Argentine ants have an important effect on community structure of the South African fynbos because

Accepted Answer

A)  they do not disperse seeds, while native ants do. 
B)  they disperse seeds more effectively than do native ants. 
C)  they disperse seeds in different spatial patterns than do native ants. 
D)  as keystone species, they greatly increase the local diversity of native ants. 
E)  Argentine ants have invaded many communities, but not the South African fynbos. 
A)  they do not disperse seeds, while native ants do. 
B)  they disperse seeds more effectively than do native ants. 
C)  they disperse seeds in different spatial patterns than do native ants. 
D)  as keystone species, they greatly increase the local diversity of native ants. 
E)  Argentine ants have invaded many communities, but not the South African fynbos.

Question 4

A keystone species is one

Accepted Answer

A)  that makes up a very large proportion of total community biomass. 
B)  that feeds on a very large fraction of all available prey species. 
C)  that is fed on by a very large fraction of all predators in its community. 
D)  whose feeding activities have a disproportionate effect on the structure of its community. 
E)  that occupies the lowest level (the base) of the food web. 
A)  that makes up a very large proportion of total community biomass. 
B)  that feeds on a very large fraction of all available prey species. 
C)  that is fed on by a very large fraction of all predators in its community. 
D)  whose feeding activities have a disproportionate effect on the structure of its community. 
E)  that occupies the lowest level (the base) of the food web.

Question 5

Human hunters in the Amazon rain forests kill

Accepted Answer

A)  large numbers of almost every mammal and bird species, for food and for skins. 
B)  large numbers of the smallest mammal and bird species, which are easiest to catch. 
C)  large numbers primarily of the largest mammal and bird species. 
D)  large numbers of mammals and birds, but do not greatly affect population densities. 
E)  only a few mammals and birds, but because humans are keystone species, these few kills greatly reduce population densities. 
A)  large numbers of almost every mammal and bird species, for food and for skins. 
B)  large numbers of the smallest mammal and bird species, which are easiest to catch. 
C)  large numbers primarily of the largest mammal and bird species. 
D)  large numbers of mammals and birds, but do not greatly affect population densities. 
E)  only a few mammals and birds, but because humans are keystone species, these few kills greatly reduce population densities.

Question 6

Ecologists summarize feeding interactions among species in a community when they compile a ________.

Accepted Answer

The answer of Ecologists summarize feeding interactions among species in...

Question 7

In Robert Paine's studies of the Washington intertidal community, which organism proved to be a keystone species?

Accepted Answer

A)  The whelk Thais 
B)  Acorn barnacles 
C)  Chitons 
D)  The starfish Pisaster 
E)  Limpets 
A)  The whelk Thais 
B)  Acorn barnacles 
C)  Chitons 
D)  The starfish Pisaster 
E)  Limpets

Question 8

A predator and its prey interact ________, but if the predator affects another species through this interaction, ecologists describe it as a(n) ________ interaction.

Accepted Answer

A)  strongly; inefficient 
B)  directly; variable 
C)  weakly; diffuse 
D)  indirectly; keystone 
E)  directly; indirect 
A)  strongly; inefficient 
B)  directly; variable 
C)  weakly; diffuse 
D)  indirectly; keystone 
E)  directly; indirect

The presence of cleaner wrasse enhances diversity of fishes on coral reefs.

What would be the most likely effect of removing the blue tit from the Phragmites australis ecosystem?

Invasive Argentine ants have an important effect on community structure of the South African fynbos because

A keystone species is one

Human hunters in the Amazon rain forests kill

Ecologists summarize feeding interactions among species in a community when they compile a ________.

In Robert Paine's studies of the Washington intertidal community, which organism proved to be a keystone species?

A predator and its prey interact , but if the predator affects another species through this interaction, ecologists describe it as a(n) interaction.

Introduction to Ecology: Historical Foundations and Developing Frontiers

Life on Land

Life in Water

Population Genetics and Natural Selection

Temperature Relations

Water Relations

Energy and Nutrient Relations

Social Relations

Population Distribution and Abundance

Population Dynamics

Population Growth

Life Histories

Competition

Exploitative Interactions: Predation, Herbivory, Parasitism, and Disease

Mutualism

Species Abundance and Diversity

Primary Production and Energy Flow

Nutrient Cycling and Retention

Succession and Stability

Landscape Ecology

Geographic Ecology

Global Ecology

Filters

Exam 17: Species Interactions and Community Structure

The presence of cleaner wrasse enhances diversity of fishes on coral reefs.

What would be the most likely effect of removing the blue tit from the Phragmites australis ecosystem?

Invasive Argentine ants have an important effect on community structure of the South African fynbos because

A keystone species is one

Human hunters in the Amazon rain forests kill

Ecologists summarize feeding interactions among species in a community when they compile a ________.

In Robert Paine's studies of the Washington intertidal community, which organism proved to be a keystone species?

A predator and its prey interact ________, but if the predator affects another species through this interaction, ecologists describe it as a(n) ________ interaction.

Introduction to Ecology: Historical Foundations and Developing Frontiers

Life on Land

Life in Water

Population Genetics and Natural Selection

Temperature Relations

Water Relations

Energy and Nutrient Relations

Social Relations

Population Distribution and Abundance

Population Dynamics

Population Growth

Life Histories

Competition

Exploitative Interactions: Predation, Herbivory, Parasitism, and Disease

Mutualism

Species Abundance and Diversity

Primary Production and Energy Flow

Nutrient Cycling and Retention

Succession and Stability

Landscape Ecology

Geographic Ecology

Global Ecology

Filters

A predator and its prey interact , but if the predator affects another species through this interaction, ecologists describe it as a(n) interaction.