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Chapter 16
What is an Ecosytem?
25
Science
8th Grade
03/10/2011

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Term
Ecology
Definition
Is the study of the interactions of living orginisms with one another and with physical environment.
Term
Habitat
Definition
The place where a particular of a species lives.
Term
Community
Definition
the many different species that live together in a habitat.
Term
Ecosystem
Definition
or ecological system, consists of a community and all physical aspects of its habitat.
Term
Abiotic
Definition
the physical aspects of a habitat.
Term
Biotic
Definition
The organisms in a habitat.
Term
Biodiversity
Definition
the communities and ecosytems in which they occur.
Term
Pioneer species
Definition
The first organisms to live in a new habitat where soil is present tend to be small, fast growing plants.
Term
Succession
Definition
A somewhat regular progression of species replacement.
Term
primary succession
Definition
Succession that occurs where life has not existed before.
Term
Secondary succession
Definition
Succession that occurs in areas where there has been previous growth.
Term
Producers
Definition
include plants, some kinds of bacteria, and algae.
Term
Consumers
Definition
are those organisms that consume plants or other organisms to obtain the energy necessary.
Term
trophic level
Definition
in a graphic organizer based on the organisms source of energy.
Term
Food chain
Definition
The path of energy through the trophic levels.
Term
herbivores
Definition
animals that eat plants or other primary producers.
Term
Carnivores
Definition
Tigers, wolves, and snakes are carnivores.
Term
Omnivores
Definition
such as bears, are both herbivores and carnivores.
Term
decomposers
Definition
of bodies and wastes releases nutrients back into the environment.
Term
food web
Definition
this creates a complicated, interconnected group of food chains.
Term
Energy pyramid
Definition
is a diagram in which each trophic level is represented by a block.
Term
biomass
Definition
is the dry weight of tissue and other organic matter.
Term
ground water
Definition
which is water retained beneath the surface of the earth.
Term
transpiration
Definition
is also a sun driven process.
Term
nitrogen fixation
Definition
bacteria live in the soil and are also found within swellings, or nodules, on the roots of beans.
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