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Lecture

BIOLOGY 1M03 Lecture Notes - Decomposer, Species Richness, Autotroph


Department
Biology
Course Code
BIOLOGY 1M03
Professor
Jon Stone

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Ecosystems
Questions
In Figure 53.9, where do you see the highest species richness?
o community 1
o community 2
o community 3
o community 4
o both community 2 and community 4
Key Concepts
An ecosystem has four components:
o the abiotic environment
o primary producers
o consumers
o decomposers
These components are linked by the movement of energy and nutrients.
availability is the key constraint in aquatic ecosystems. As energy flows from producers to
consumers and decomposers, much of it is lost.
To analyze nutrient cycles, biologists focus on the nature of the reservoirs where elements
reside and on how quickly elements move between reservoirs.
Humans are causing large, global changes in the abiotic environment. The burning of fossil fuels
has led to rapid global warming. Extensive fertilization is increasing productivity and causing
pollution.
Introduction
An ecosystem consists of the multiple communities of organisms that live in an area and their
chemical and physical (abiotic) environment.
This chapter focuses on changes in the chemical and physical characteristics of the environment.
Energy Flow and Trophic Structure
Ecosystems have four components:
o primary producers
o consumers
o decomposers
o the abiotic environment
These components are linked by a flow of energy.
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