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The group of species that occupy a given area, interacting either directly or indirect
The group of species that occupy a given area, interacting either directly or indirect
Community
expressed as the proportion each species contributes to the total number of individuals of all species within the
community.
expressed as the proportion each species contributes to the total number of individuals of all species within the community.
Relative abundance
the most abundant species is plotted
first along the x-axis, with the corresponding value on the y-axis
being its value of relative abundance.
the most abundant species is plotted first along the x-axis, with the corresponding value on the y-axis being its value of relative abundance.
Rank abundance diagram
The rank-abundance diagram illustrates two features of community structure
The rank-abundance diagram illustrates two features of community structure
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count of the number of species occurring within the
community, and is typically denoted by the symbol S.
count of the number of species occurring within the community, and is typically denoted by the symbol S.
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refers to the equitability in the distribution of individuals among the species
refers to the equitability in the distribution of individuals among the species
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which consider both the number and relative abundance of
species within the community
which consider both the number and relative abundance of species within the community
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measures the probability that two
individuals randomly selected from a sample will belong to the
same species
measures the probability that two individuals randomly selected from a sample will belong to the same species
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When a single or few species predominate within a community,
those species are referred to
When a single or few species predominate within a community, those species are referred to
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A species that has a disproportionate impact on the community relative to its abundance
A species that has a disproportionate impact on the community relative to its abundance
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a descriptive
diagram—a series of arrows, each pointing from one species
to another, representing the flow of food energy from prey (the
consumed) to predator (the consumer
a descriptive diagram—a series of arrows, each pointing from one species to another, representing the flow of food energy from prey (the consumed) to predator (the consumer
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highly interwoven, with linkages representing the complex interactions of predator and prey
highly interwoven, with linkages representing the complex interactions of predator and prey
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and the arrows from the consumed to the consumers
and the arrows from the consumed to the consumers
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feed on no other species but are fed
on by other
feed on no other species but are fed on by other
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feed on other species and
they are prey of other species.
feed on other species and they are prey of other species.
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are not subject to
predators; they prey on intermediate and basal species.
are not subject to predators; they prey on intermediate and basal species.
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a measure of the average number
of links per species in the food web.
a measure of the average number of links per species in the food web.
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