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An interaction that occurs between two species, such as competition, exploitation, or a positive interaction.
What is direct interaction?
The identity of the species present in a community.
What is species composition?
The diversity of important ecological entities that span multiple spatial scales, from genes to species to communities.
What is biodiversity?
A diagram showing the connections between organisms and the food they consume.
What is food web?
A subset of a community that includes species that function in similar ways, but do not necessarily use the same resources.
What is functional group?
An interaction in which the relationship between two species is mediated by a third (or more) species.
What is indirect interaction?
The number of species in a community.
What is species richness?
Having the same function in a community as other species in that community within a larger functional group.
What is redundant species?
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.
What is trophic level?
A subset of a community that includes species that use the same resources, whether or not they are taxonomically related.
What is guild?
A group of interacting species that occur together at the same place and time.
What is community?
The relative abundances of species in a community compared with one another.
What is species evenness?
A species that has large, community-wide effects by virtue of its size or abundance, its strong competitive ability, or its provision of habitat or food for other species, also called a foundation species.
What is dominant species?
A concept that describes both the trophic (vertical) and non-trophic (horizontal) interactions among the species in a traditional food web.
What is interaction web?
The index most commonly used to describe species diversity quantitatively.
What is Shannon index?
A measure of the effect of one species (the interactor) on the abundance of another species (the target species).
What is interaction strength?
A measure that combines the number of species (species richness) in a community and their relative abundances compared with one another (species evenness).
What is species diversity?
A strong interactor that has an effect on energy flow and community structure that is disproportionate to its abundance or biomass.
What is keystone species?
An interaction in which a consumer is indirectly facilitated by a positive interaction between its prey or food plant and another species.
What is trophic facilitation?
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.
What is rank abundance curve?
Non-trophic interactions, such as competition and some positive interactions, that occur within a trophic level.
What is horizontal interactions?
The set of characteristics that shape a community, including the number, composition, and abundance of species.
What is community structure?
A species that influences its community by creating, modifying, or maintaining physical habitat for itself and other species.
What is ecosystem engineer?
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.
What is trophic cascade?
A graph that plots species richness as a function of the total number of individuals that have accumulated with each additional sample.
What is species accumulation curve?