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Science C3L1
Humans and the ecosystem
Quick review
What is an ecosystem?
Predator and Prey Interactions
Food Chains and Webs
Water Cycle
Take a few minutes to think about some of these questions and discuss them with a partner:
What is your place in the ecosytem?
Do you visit nature, or do you think of it as your home?
Do you worry about your effect on other species, or do you think non-human species are less important than you?
Should people control ecosystems, or should people control their use of ecosystems?
The Great Debate!!!
State your opinion.
Pro Genetic Modification of Food
or Pro Organic
http://www.wisegeek.org/what-are-the-pros-and-cons-of-genetically-engineered-food.htm
Though we play a key role in shaping our ecosystems, humans, just like all other living organisms rely on ecosystems to provide their
needs for survival and to recycle waste.
Our goal is to have a sustainable ecosystem.
A sustainable ecosystem is one which is able to replace the resources used and recycle the waste that people put in.
When an ecosytem is no longer sustainable, certain species can no longer thrive or survive in such environments.
In such cases, the species either dies or leaves.
As a strong ecosytem has a variety of species and complex interactions, the loss of a species has a negative effect.
The variety of species in an ecosytem is called biodiversity.
Just like overpopulation threatens the sustainability of ecosystems,
the loss of biodiversity also has a negative effect on the survival of ecosystems.
How might the loss of biodiversity affect an ecosystem?
HW Time
Read pages 58-61
questions 1-3
As the human population continues to grow, our consumption and waste has also grown.
With this growth resources are removed faster than they can be replaced, and waste accumulates faster than the natural cycles can deal with them.
As humans are the dominant species in the biosphere
we are capable of affecting how ecosystems are shaped.
With such power we need to think about our roles in shaping ecosystems.
Deforestation
Human activity such as logging, farming, fishing, and building can
impact the living (biotic) and physical (abiotic) components of an ecosystem.
The ecosystem is no longer sustainable.