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Week 4 Law of Tolerance

Here are 3 examples of organisms thriving in given environments based on the law of tolerance and possible environmental factors that tolerate or limit them: 1. Tundra Arctic hare, Cold temperatures, Lack of vegetation, caribou short growing season extreme cold 2. Coral reef Clownfish, sea Warm waters, Rising ocean anemone calcium-rich waters temperatures, ocean acidification 3. Rainforest Orchid, sloth, High humidity, Deforestation, forest toucan abundant resources fires

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432 views17 pages

Week 4 Law of Tolerance

Here are 3 examples of organisms thriving in given environments based on the law of tolerance and possible environmental factors that tolerate or limit them: 1. Tundra Arctic hare, Cold temperatures, Lack of vegetation, caribou short growing season extreme cold 2. Coral reef Clownfish, sea Warm waters, Rising ocean anemone calcium-rich waters temperatures, ocean acidification 3. Rainforest Orchid, sloth, High humidity, Deforestation, forest toucan abundant resources fires

Uploaded by

jamaellajane
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Republic of the Philippines

POLYTECHNIC UNIVERSITY OF THE PHILIPPINES


OFFICE OF THE VICE PRESIDENT FOR BRANCHES AND CAMPUSES
Calauan, Laguna Campus

GEED 009 (Environmental Science)

Concepts of Range and


Limits:
Law of Tolerance
Presented By:

JOHN PAUL B. ENRIQUEZ, LPT, MAEd


Assistant Professorial Lecturer 3
Objectives

At the end of the lesson, you must be able to:


a. Define law of tolerance
b. Cite examples of law of tolerance in an area.
c. Realize the importance of law of tolerance in
environmental and organismal survival and existence.
Starter

Picture Analysis

Analyze the situation or phenomenon depicted by the images


on the next slide and try to infer the reason why these phenomena
occurs.
Starter
Starter
Starter
Starter
Discussion
Concepts of Range and Limits
Discussion

Shelford’s Law of Tolerance

➢States that “the distribution of


each species is determined by its
range of tolerance to variation
in each environmental factor.”
➢It was developed by American
zoologist Victor Ernest Shelford
in 1911.
Discussion

➢the abundance or distribution


of an organism can be
controlled by certain factors
(e.g. the climatic, topographic,
and biological requirements of
plants and animals) where
levels of these exceed the
maximum or minimum limits of
tolerance of that organism.
Discussion
Discussion

➢The organism will survive if the


temperature, humidity, air and
other environmental factors are
within the optimum range.

➢There are upper and lower


limits to the physical factors an
organism can tolerate.
Discussion
Some supplementary to the law
of tolerance
➢ First, plants and animals may
have a wide range of tolerance
for one environmental factor
but relatively narrow range of
tolerance for another factor
➢Second, organisms with wide
ranges of tolerance for all actors
are likely to be most widely
distributed.
Discussion
Ex: Antarctic Fish (Trematomus bernacchii)
Discussion

Highlights

➢ Each organism has its own higher and lower limit of tolerance.
This capacity decides their distribution in environment.
➢As we emphasized, organisms are not just slaves to the physical
environment, they adapt themselves and modify the physical
environment so as to reduce the limiting effects of temperature,
light, water and other physical conditions of existence.
Activity

Floras and Faunas and their environment

1. Based on the concept of Law of Tolerance, cite examples of


organisms thriving in the given environment.
2. Cite possible environmental factors that tolerates or limits
organisms to survive.
3. Present output through a table.
Activity
Environment Thriving Tolerating Limiting
Organisms Environmental Environmental
Factors Factors

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