Biomagnification Bioaccumulation.

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Presentation transcript:

Biomagnification Bioaccumulation

Content Bioaccumulation Biomagnification Bioaccumulation vs Biomagnification What types of substances bioaccumulate and which do not? Concentration of DDT in tissue Concentration of mercury in fish

Bioaccumulation Definition: The accumulation (gradual gathering) of substances transferring from the environment into an organism. Types of Substances that can accumulate: Nutrients, Toxins, Pesticides, Organic and Inorganic Compounds and Elements (such as mercury), and other pollutants.

Bioaccumulation How substances can get from the environment into an organism: Food intake (can eat something from environment that contains substance) Respiration (breathing it in) Skin Contact

Bioaccumulation Example of Pesticides: DDT (chemical) Example of naturally occurring elements: MERCURY (low concentrations can cause

Link to Resource http://www.nwf.org/Wildlife/Wildlife-Conservation/Food-Webs.aspx https://www.youtube.com/watch?v=DxqDaTUh08o https://www.youtube.com/watch?v=E5P-UoKLxlA

”Madd as a hatter”

Biomagnification Substances such as pollutants become concentrated as you move up the food chain Energy passes through the food chain Energy is lost as you move up the Food Pyramid Levels of toxins and harmful substances can increase as you move up the Food Pyramid

Bioaccumulation vs Biomagnification Both describe the increase of the amount of a substance in an organism (1,3) Bioaccumulation occur within a single organism (1) Biomagnification occurs across trophic levels (3)

Concentration of DDT in tissue How does it pass through a food chain Used as a pesticide – from insects to fish, birds and then larger animals

Mercury in Fish Fish absorb mercury efficiently Larger fish eat many small fish and build up higher levels of mercury Some have been banned for consumption for they present a toxic risk

Works cited "Bioaccumulation". Wikipedia. 13.06.2010 <http://en.wikipedia.org/wiki/Bioaccumulation>. "Bioaccumulation". Toxics US Gov. 13.06.2010 <http://toxics.usgs.gov/definitions/bioaccumulation.html>. http://www.marietta.edu/~biol/102/2bioma95.html "Biomagnification and Bioaccumulation". Tripod. 13.06.2010 <http://domchemct.tripod.com/index.html>. http://wiki.answers.com/Q/Example_of_biomagnification "Biomagnification". 13.06.2010 <http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/D/DDTandTrophicLevels.html >. http://www.dowcorning.com/content/publishedlit/01-1128-01.pdf "Environmental Biology - Ecosystems ". 13.06.2010 <http://www.marietta.edu/~biol/102/ecosystem.html>. http://www.pollutionissues.com/A-Bo/Bioaccumulation.html "Food Chain/Biomagnification". 13.06.2010 <http://science.jrank.org/pages/2801/Food-Chain-Web-Biomagnification.html>.