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BIOC50H3 (15)
Chapter 15

Lecture 15 - Chapter 15 Key Terms

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Department
Biological Sciences
Course Code
BIOC50H3
Professor
Marc Cadotte

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Chapter 15 Key Terms
x biodiversity
o A term used to describe the diversity of important ecological entities that span
multiple spatial scales, from genes to species to communities.
x community
o A group of interacting species that occur together at the same place and time.
x community structure
o The set of characteristics that shape a community, including the number,
composition, and abundance of species.
x context-dependent
o A view of species interactions as variable in strength and direction under different
environmental conditions.
x direct interactions
o Interactions between two species, including traditional relationships such as
competition, predation, and positive interactions. Compare indirect interactions.
x dominant species
o 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.
x ecosystem engineer
o A dominant species that influences its community by creating, modifying, or
maintaining physical habitat for itself and other species.
x functional group
o A subset of the species in a community that function in similar ways, but do not
necessarily use the same resources. Compare guild.
x guild
o A subset of the species in a community that use the same resources, whether or
not they are taxonomically related. Compare functional group.
x horizontal interactions
o Non-trophic interactions, such as competition and some positive interactions, that
occur within a trophic level.
x indirect interactions
o Interactions in which the relationship between two species is mediated by a third
(or more) species. Compare direct interactions.
x interaction strength
o $PHDVXUHRIWKHHIIHFWRIRQHVSHFLHV¶SRSXODWLRQRQWKHVL]HRIDQRWKHUVSHFLHV¶
population.
x interaction web
o A concept that has been introduced to describe both the trophic (vertical) and non-
trophic (horizontal) interactions in a traditional food web.
x keystone species
o A strongly interacting species that has a large effect on energy flow and on
community structure and composition disproportionate to its abundance or
biomass.
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Description
Chapter 15 Key Terms x biodiversity o A term used to describe the diversity of important ecological entities that span multiple spatial scales, from genes to species to communities. x community o A group of interacting species that occur together at the same place and time. x community structure o The set of characteristics that shape a community, including the number, composition, and abundance of species. x context-dependent o A view of species interactions as variable in strength and direction under different environmental conditions. x direct interactions o Interactions between two species, including traditional relationships such as competition, predation, and positive interactions. Compare indirect interactions. x dominant species o 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. x ecosystem engineer o A dominant species that influences its community by creating, modifying, or maintaining physical habitat for itself and other species. x functional group o A subset of the species in a community that function in similar ways, but do not necessarily use the same resources. Compare guild. x guild o A subset of the species in a community that use the same resources, whether or not they are taxonomically related. Compare functional group. x horizontal interactions o Non-trophic interactions, such as competition and some positive interactions, that occur within a trophic level. x indirect interactions o Interactions in which the relationship between two species is mediated by a third (or more) species. Compare direct interactions. x interaction strength o $PHDVXUHRIWKHHIIHFWRIRQHVSHFLHV¶SRSXODWLRQRQWKHVL]HRIDQRWKHUVSHFLHV¶population. x interaction web o A concept that has been introduced to describe both the trophic (vertical) and non-trophic (horizontal) interactions in a traditional food web. x keystone species o A strongly interacting species that has a large effect on energy flow and on community structure and composition disproportionate to its abundance or biomass. www.notesolution.com x omnivore o An organism that feeds on more than one trophic level and/or feeds on both plants and animals. x rank abundance curve o 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. x Shannon index o The index most commonly used to describe species diversity quantitatively. x species accumulation curve o A graph that plots species richness as a function of the total number of individuals that have accumulated with each additional sample. x species composition o The identity of the species present in a community. x species diversity o A measure that combines both the number of species (species richness) in a community and their relative abundances compared with one another (species evenness). x species evenness o The relative abundances of species in a community compared with one another. x species richness o The number of species in a community. x trophic cascade o A change in the rate of consumption at one trophic level that results in a series of changes in species abundances and species compositions at lower trophic levels. x trophic facilitation o An interaction in which a consumer is indirectly facilitated by a positive interaction between its prey and another species. x trophic level o A group of species in a community that obtain energy in similar ways, classified by the number of feeding steps by which the group is removed from auto-trophs, which are the first trophic level. www.notesolution.comChapter 15 Key Terms N biodiversity o A term used to describe the diversity of important ecological entities that span multiple spatial scales, from genes to species to communities. N community o A group of interacting species that occur together at the same place and time. N community structure o The set of characteristics that shape a community, including the number, composition, and abundance of species. N context-dependent o A view of species interactions as variable in strength and direction under different environmental conditions. N direct interactions o Interactions between two species, including traditional relationships such as competition, predation, and positive interactions. Compare indirect interactions. N dominant species o 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. N ecosystem engineer o A dominant species that influences its community by creating, modifying, or maintaining physical habitat for itself and other species.
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