Transcript Human Impacts on Ecosystems

Thursday, September 22
Put the following organisms in
order for the food chain with
arrows to show the energy
flow:
Wolf, sun, flower, grasshopper,
bird, bear, raccoon.
Energy Pyramid
Patterns
▶
The energy decreases
the higher the trophic
level. (10 % is
transferred; 90% lost)
▶
The higher the
trophic level, the
greater the
concentration of
toxins. (10 times
more)
Humans impact the ecosystem
in positive and negative ways.
▶ Watch
the following short video to
learn some of the ways humans
affect the ecosystem.
NegativeHuman Influences on Ecosystems
1. Habitat Destruction
▶
Human development
▶
Deforestation
2.
Land Loss/Desertification
3.
Non-native Species/Invasive Species
▶
4.
Competition for Resources
Over Harvesting
fishing/hunting
5. Pollution/Global Warming
▶
Air and Water
Positive Human Impacts on the Ecosystem
▶ Making
wildlife animal refuges to increase
the population of endangered species.
▶ Planting
trees to reduce the impact of
deforestation.
▶ Cleaning
up the pollution of rivers and
oceans.
▶ Reduce,
Reuse, Recycle
Human Impact on Food Webs
▶
Humans can affect food webs in many ways, some
positive, most negative. Humans sometimes
restore animals or plants to an area to help rebuild food webs. Sometimes we destroy habitats
or interfere with normal animal behaviors. These
things can have a severe impact on food webs,
affecting not only one animal but many
organisms.
Warm Up: 4/20/16
Pull out a lined piece of paper. While
watching a video clip answer the following:
1- What are 4 reasons why ecosystems are
important?
2- Label 1-5 leaving about three spaces in
between each number. List 5 ways humans
impact ecosystems and describe each one.
Your job is to create a television news
broadcast about how humans have
affected a local food web.
▶
Requirements:
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Opening Introduction with names, class period, and a closing
▶
Information for each of the following:
▶
Create and describe a situation where a human activity is affecting
one of the organisms on the food web.
▶
▶
▶
Example – The new style at local schools is homemade frog-leg necklaces,
this is leading to a sharp decrease in the local frog population.
Talk about how at least three other organisms in the food web are
being affected. (are they running out of food, are their populations
exploding because they have lost predators, are their predators eating
them more because they have lost another food source, etc…
Propose one or more solutions to the problem that might be
realistic.
▶
For example – Banning frog-leg necklaces in schools, educating the
students on the impact that they are having on the local food web, or
starting a competition to design the next cool necklace that doesn’t
include animal parts.