PCB 3044 Ecology Chapters 12-17
Comprehensive Questions
(Frequently Tested) and Complete
Solutions Graded A+
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The diversity of important ecological entities that span multiple
spatial scales, from genes to species to communities - Answer:
Biodiversity
,A group of interacting species that occur together at the same
place and time - Answer: Community
The set of characteristics that shape a community, including the
number, composition, and abundance of species - Answer:
Community Structure
Sets of competitive interactions involving multiple species in
which every species negatively interacts with every other species,
thus promoting species coexistence - Answer: Competitive
Networks
A group of species that obtain energy in similar ways, classified by
the number of feeding steps by which the group is removed from
primary producers, which are the first trophic level - Answer:
Trophic Level
A diagram showing the connections between organisms and the
food they consume - Answer: Food Web
An interaction that occurs between two species, such as
predation, competition, or a positive interaction - Answer: Direct
Interaction
,Non-trophic interactions, such as competition and some positive
interactions, that occur within a trophic level - Answer: Horizontal
Interactions
An interaction in which the relationship between two species is
mediated by a third (or more) species - Answer: Indirect
Interaction
A measure of the effect of one species (the interactor) on the
abundance of another species (the target species) - Answer:
Interaction Strength
A concept that describes both the trophic (vertical) and non-
trophic (horizontal) interactions among the species in a traditional
food web - Answer: Interaction Web
A change in the rate of consumption at one trophic level that
results in a series of changes in species abundance or composition
at lower trophic levels - Answer: Trophic Cascade
An interaction in which a consumer is indirectly facilitated by a
positive interaction between its prey or food plant and another
species. - Answer: Trophic Facilitation
, A species that has large, community-wide effects on the habitat or
food of other species by virtue of its size or abundance - Answer:
Foundation Species
A species that influences its community by creating, modifying, or
maintaining physical habitat for itself and other species - Answer:
Ecosystem Engineer
A strong interactor species that has an effect on energy flow and
community structure that is disproportionate to its small size,
abundance, or biomass - Answer: Keystone Species
A subset of a community that includes species that function in
similar ways, but do not necessarily use the same resources -
Answer: Functional Group
A subset of a community that includes species that use the same
resources, whether or not they are taxonomically related. -
Answer: Guild
A graph that plots the proportional abundance of each species in
a community relative to the others in rank order, from most
abundant to least abundant - Answer: Rank Abundance Curve
Comprehensive Questions
(Frequently Tested) and Complete
Solutions Graded A+
Professional Academic Assistance Services
Services Offered
• Proctored Exam Assistance
• Online Class Management (Full Course Support)
• Exam Preparation & Study Materials
• Assignments and Coursework Support
• Essay and Research Paper Writing
• Discussion Posts & Responses
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The diversity of important ecological entities that span multiple
spatial scales, from genes to species to communities - Answer:
Biodiversity
,A group of interacting species that occur together at the same
place and time - Answer: Community
The set of characteristics that shape a community, including the
number, composition, and abundance of species - Answer:
Community Structure
Sets of competitive interactions involving multiple species in
which every species negatively interacts with every other species,
thus promoting species coexistence - Answer: Competitive
Networks
A group of species that obtain energy in similar ways, classified by
the number of feeding steps by which the group is removed from
primary producers, which are the first trophic level - Answer:
Trophic Level
A diagram showing the connections between organisms and the
food they consume - Answer: Food Web
An interaction that occurs between two species, such as
predation, competition, or a positive interaction - Answer: Direct
Interaction
,Non-trophic interactions, such as competition and some positive
interactions, that occur within a trophic level - Answer: Horizontal
Interactions
An interaction in which the relationship between two species is
mediated by a third (or more) species - Answer: Indirect
Interaction
A measure of the effect of one species (the interactor) on the
abundance of another species (the target species) - Answer:
Interaction Strength
A concept that describes both the trophic (vertical) and non-
trophic (horizontal) interactions among the species in a traditional
food web - Answer: Interaction Web
A change in the rate of consumption at one trophic level that
results in a series of changes in species abundance or composition
at lower trophic levels - Answer: Trophic Cascade
An interaction in which a consumer is indirectly facilitated by a
positive interaction between its prey or food plant and another
species. - Answer: Trophic Facilitation
, A species that has large, community-wide effects on the habitat or
food of other species by virtue of its size or abundance - Answer:
Foundation Species
A species that influences its community by creating, modifying, or
maintaining physical habitat for itself and other species - Answer:
Ecosystem Engineer
A strong interactor species that has an effect on energy flow and
community structure that is disproportionate to its small size,
abundance, or biomass - Answer: Keystone Species
A subset of a community that includes species that function in
similar ways, but do not necessarily use the same resources -
Answer: Functional Group
A subset of a community that includes species that use the same
resources, whether or not they are taxonomically related. -
Answer: Guild
A graph that plots the proportional abundance of each species in
a community relative to the others in rank order, from most
abundant to least abundant - Answer: Rank Abundance Curve
