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Human
Ecology
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Stay=
ing
positive and
addressing the negative.
addressing the negative.
![](3D"slide0002_image004.gif")
=
“So…..what’s
good?”
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How do we
determine if we should do something or not?
•
cost/benefit analysis
![](3D"slide0003_image006.gif")
The Issue
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•Increasing human population puts pres=
sure
on limited, finite resources.
•The human struggle for these resources
has affected natural processes such as:
•Atmospheric quality
•Soil generation and conservation
•Water and other nutrient cycling
•Energy flow
•Waste removal
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=
The
Harm
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•Human activities have negatively impa=
cted
the environment by depleting non-renewable resou=
rces
and causing a decrease in biodiversity.
•Poor land use
•Deforestation
•Soil, water and air pollution
•Introduced and invasive species
![](3D"slide0005_image011.jpg")
![](3D"slide0005_image012.gif")
Why Mr. U. HATES
cats
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=
•Here̵=
7;s Felis
catus or “muffin”
![](3D"slide0005_image014.gif")
Here’s Felis sylvestris
![](3D"slide0005_image016.jpg")
![](3D"slide0005_image017.gif")
See a big diffe=
rence?
![](3D"slide0006_image018.gif")
•Hard
to see. Here’s the
difference.
![](3D"slide0006_image019.gif")
=
Why Mr. U. HATES
cats
![](3D"slide0006_image020.gif")
The African Wildcat lives in the steppes of Easte=
rn
African and the mid=
dle
east.
It has lived there for several hundred thousand y=
ears.
The other organisms in that region have lived with
wildcats for the same
amount of time, evolving right along with them. That’s =
where they “belong”.
Humans brought the cats with them to other contin=
ents
and ecosystems that=
have
not “evolved” with the pressures of cats.
Cat predation has caused a 40% loss in our songbi=
rd =
population.
KEEP YOUR CAT INDOORS!!!!!!!
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=
It’s
not just cats.
![](3D"slide0007_image022.gif")
•Invasive species out-compete the othe=
r native
populations and cause big problems:
•Gypsy moth caterpillars
•Asian long-horned beetle
•Dutch elm disease
•Kudzu vines
•Too many more to name…… <=
/div>
![](3D"slide0008_image023.gif")
=
Controlling pests
without upsetting the ecosyste= m too much
without upsetting the ecosyste= m too much
![](3D"slide0008_image024.gif")
•Biological control: Using predatory <=
/span>=
organisms
to control pest populations.
•e.g. Ladybugs to control aphids
<=
/div>
•
Tachinid flies to conrol gypsy moth caterpillars
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=
Laws
and Legislation
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•Endangered species act
•Clean air and clean water acts
•Carbon crediting
•Hunting and fishing regulations
![](3D"slide0010_image027.gif")
=
Lifestyle
Changes
![](3D"slide0010_image028.gif")
•How we grow food: local and organic <=
/span>farming,
sustainable agriculture
•Recycling programs
•Education: e.g. Frost Valley
Use of
renewable resources rather than non-renewable resources
' + ENDSHOW_MESG + '
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