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Chapter 55

Chapter 55: Community Ecology -- KEY TERMS & DEFINITIONS

3 Pages
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Department
Biological Sciences
Course Code
BIOA02H3
Professor
Kamini Persaud

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Key TermsChapter 55: Community Ecology
55.1- What are ecological communities?
community: species that live and interact in an area
trophic level: consists of the organisms whose energy source has passed through
the same number of steps to reach them
primary producers: photosynthesizers—plants (autotrophs)
primary consumers: organisms that eat plants (herbivores)
secondary consumers: organisms that eat herbivores
decomposers: organisms that eat the dead bodies of organisms or their waste
products
food chain: a sequence of interactions in which a plant is eaten by an herbivore,
which is in turn eaten by a secondary consumer, and so on.
Food chains are usually interconnected to make a food web.
Biomass: distribution of energy
55.2-What processes influence community structure?
Predation or parasitism: interactions in which one participant is harmed, but the
other benefits
Competition: interactions in which two organisms use the same resources and
those resources are insufficient to supply their combined needs
Mutualism: interactions in which both participants benefit
Commensalism: interactions in which one participant benefits but the other is
unaffected
Amensalism: interactions in which one participant is harmed but the other is
unaffected
Interference competition: individuals reduce the ability of others to access
resources by interfering with their activities, or by reducing the available resources:
exploitation competition
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Description
Key TermsChapter 55: Community Ecology 55.1- What are ecological communities? community: species that live and interact in an area trophic level: consists of the organisms whose energy source has passed through the same number of steps to reach them primary producers: photosynthesizersplants (autotrophs) primary consumers: organisms that eat plants (herbivores) secondary consumers: organisms that eat herbivores decomposers: organisms that eat the dead bodies of organisms or their waste products food chain: a sequence of interactions in which a plant is eaten by an herbivore, which is in turn eaten by a secondary consumer, and so on. Food chains are usually interconnected to makfe ooad web. Biomass: distribution of energy 55.2-What proces
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