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Bio Lecture 33: Ecosystem

by: Kiara Reyes

Bio Lecture 33: Ecosystem Bio 211

Marketplace > Northern Illinois University > Biology > Bio 211 > Bio Lecture 33 Ecosystem
Kiara Reyes
GPA 2.9
Funds of Organismal Biology Lab
Catherine Ausland

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About this Document

Here are the ecosystem notes that will be part of the next Exam coming up. Study hard
Funds of Organismal Biology Lab
Catherine Ausland
Class Notes
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This 2 page Class Notes was uploaded by Kiara Reyes on Monday November 23, 2015. The Class Notes belongs to Bio 211 at Northern Illinois University taught by Catherine Ausland in Fall 2015. Since its upload, it has received 56 views. For similar materials see Funds of Organismal Biology Lab in Biology at Northern Illinois University.


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Date Created: 11/23/15
Lecture 33 Ecosystem 1 Transfer of Energy and Materials through Trophic Levels Energy Elows not cycles through ecosystems Energy ows follow 1St and 2nd laws of Thermodynamics Energy can t be created or destroyed BUT can change form light energy to chemical band Energy to heat Energy Primary Producers Sun s energy stored in chemical bonds by primary producers C02 H20 sunlight gt 02 Carbohydrates Primary producers are autotrophs selffeeding The amount of energy in this chemical form that is available to consumers is Net Primary Productivity Expressed per area per time Low in ocean High in tropical forest near the equator Energy transfers between trophic levels 10 Secondary Production predators get converted energy when consuming prayplant 2 Water Carbon and Nitrogen Cycles Biogeochemical Cycles movement of chemicals through ecosystem including through organisms Organisms assimilate take in chemical elements Organisms release chemical events as waste and when they die and decompose EX Plant grows in dirtgt Rabbit eats plants poops seedsgt Rabbit dies decomposing gt Gives to soil to help Plants Grow Water Evaporation transpiration water loss from plants precipitation thru soil into runoff and ground water All know life requires water Where s the water 71 of Earths surface is water Vast majority is salt water Very little liquid freshwater especially at surface Carbon Cycle C02 H20 to and from CH20 02 Lots of Earth s Carbon stored in fossil fuels C02 released when human burn them for energy Nitrogen Cycle Air Nitrogen N2 not available to organisms expect after xed by certain bacteria N in all organisms nucleic acids and proteins Humans also add very large amounts of nitrogen to ecosystem as fertilizer to reduce nutrients limitation 3 Human Impacts good way Bioremediation using plants bacteria andor other organisms to clean up polluted ecosystems Organisms may break down pollutions on their own Or concentrate them leaves stems so they can be easily harvested and disposed of safety Restoration Ecology reestablishing ecosystem that have been lost or heavily degraded EX Poorlymanaged farm Diverse tall grass prairie Management or removal of livestock to avoid overgrazing Combining bioremediation and Restoration Constructing wetlands that also function in sewage treatment 0 Use biotic and abiotic compounds of biogeochemical cycles 0 Inexpensively treat sewage 0 Provide habitat for wild life


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