Unit 4 Ecosystem Dynamics and Biodiversity - PowerPoint PPT Presentation

Loading...

PPT – Unit 4 Ecosystem Dynamics and Biodiversity PowerPoint presentation | free to download - id: 70c71a-MmQ0Z



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

Unit 4 Ecosystem Dynamics and Biodiversity

Description:

This shows that they control ... Balance of nature is a theory that proposes that ecological systems are ... will be corrected by some negative feedback ... – PowerPoint PPT presentation

Number of Views:1
Avg rating:3.0/5.0
Slides: 8
Provided by: tma56
Learn more at: http://docmartinbluegrass.weebly.com
Category:

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Unit 4 Ecosystem Dynamics and Biodiversity


1
Unit 4 Ecosystem Dynamics and Biodiversity
  • Assessment Scenario Key
  • By Dr. Teresa Martin

2
(No Transcript)
3
1. (a) The predator is the lynx. The prey is the
hare. (b) Looking at the graph you can see that
both graphs rise and fall almost in sequence.
This shows that they control each other. (c) This
graph is similar to the one in the habitat
activity because each one shows the population
changes over time. (d) The factors that control
population fluctuations (changes) are the amount
of food, water, shelter and space available.
These are limiting factors.
4
2. Balance of nature is a theory that proposes
that ecological systems are usually in a stable
equilibrium (also called homeostasis), which is
to say that a small change in some particular
parameter (the size of a particular population,
for example is the stimulus) will be corrected by
some negative feedback (response) that will bring
the parameter back to its original "point of
balance" with the rest of the system. It may
apply where populations depend on each other, for
example in predator/prey relationship between the
lynx and the hare.
5
Nature is never really in balance because
populations are constantly in flux (a state of
change). Constant change is the norm, not
balance. There is no such thing as a 'balance of
nature'. The clearest evidence of this is the
harsh reality of extinction. Species don't exist
in stasis or 'balance'. They're simply contenders
for energy and organization. When a species
consumes all the available resources, or runs
into a more effective competitor for same, its
numbers crash- often to zero.
6
3. The essential components of a habitat are
food, water, shelter and space in an appropriate
arrangement.
7
4. Limiting factors are factors present in an
environment that controls a process, particularly
the growth, abundance or distribution of a
population of organisms in an ecosystem. These
are any natural resource that a population needs
to survive and reproduce.
About PowerShow.com