Class Notes (834,979)
Canada (508,839)
Biology (2,437)
BIOLOGY 1M03 (677)
Ben Evans (167)
Lecture 33

BIOLOGY 1M03 Lecture 33: 33- Ecosystems

3 Pages
Unlock Document

Ben Evans

Bio 1M03 March 28, 2016 Ecosystems Ecosystem - A biological community plus all of the abiotic factors - Climate - Energy - Soil - Nutrients - All things that influence the environment - External energy: solar energy but also chemical energy - Primary producers: organism that can synthesize their own food - Decomposers: organisms that feed on dead organisms or their waste - Consumers: organisms that feed on other organisms - Four components of an ecosystem interact o Abiotic factors, atmosphere, soil, climate o Primary producers: utilize sunlight or chemical energy to synthesize their own food reduced organic substances from inorganic substances o Consumers: organisms that eat other organisms o Decomposers acquire energy from consuming the dead remains of other organisms Mode of Digestion - Autotrophs: self-feeders - NPP: net primary productivity - NPP is the energy invested into generating new tissues - Varies among geological area How have Humans Negatively Impacted Ecosystem? - Oil Spills - Water pollution - Industries - Air pollution and Acid rain - Poor logging practice - Soil erosion Rachel Carson Silent Spring - One of the first people that brought the idea of awareness of the environment - Environmentalist - Negative impact of pesticides - Noticed the number of hawks had decreased (prey birds) Food Diagrams/ Tropic Levels - Trophic levels identify steps in energy transfer - Balsam Fir Food Web - Keystone species are essential to the health and biodiversity of the ecosystem How
More Less

Related notes for BIOLOGY 1M03

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.