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BIOACCUMULATION

Bioaccumulation

- a general term for the accumulation of substances, such as pesticides (ddt is an example), methylmercury, or other organic chemicals in an organism or part of an organism. The accumulation process involves the biological sequestering of substances that enter the organism through respiration, food intake, epidermal (skin) contact with the substance, and/or other means. The sequestering results in the organism having a higher concentration of the substance than the concentration in the organism’s surrounding environment. The level at which a given substance is bioaccumulated depends on the rate of uptake, the mode of uptake (through the gills of a fish, ingested along with food, contact with epidermis (skin), …), how quickly the substance is eliminated from the organism, transformation of the substance by metabolic processes, the lipid (fat) content of the organism, the hydrophobicity of the substance, environmental factors, and other biological and physical factors. As a general rule the more hydrophobic a substance is the more likely it is to bioaccumulate in organisms, such as fish. Another way of saying this is that bIOACCUMULATION of a substance is correlated to the octanol-water partition coefficient (KOW) of the substance. Increasing hydrophobicity (lipophilicity) leads to an increasing propensity to bioaccumulate. Some substances do not conform to this relationship, such as methlymercury. Methlymercury accumulates in fish to a much greater degree than methlymercury’s KOW would indicate.

A related term is bioconcentration. Bioconcentration differs from bIOACCUMULATION because it refers only to the uptake of substances into the organism from water alone. Bioaccumlation is the more general term because it includes all means of uptake into the organism.

source: http://toxics.usgs.gov


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Effect of Chemical spillage on ecology

... persistent and accumulative. Lipophilic in this context does not necessarily mean water insluble so, with this apparently high water table and bioaccumulation, you'll likely find the pesticide generally distributed in wildlife. I'm not with Jack that any of the bodies of water are going to ...

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by JorgeLobo
Sun Nov 27, 2011 2:26 pm
 
Forum: Ecology
Topic: Effect of Chemical spillage on ecology
Replies: 4
Views: 3886

Why do a fish contain higher pesticides

The process is called bioaccumulation. Here's a link I found in a quick google search for you. http://www.marietta.edu/~biol/102/2bioma95.html Essentially the process is as follows: microorganisms eat pesticide infected things. invertebrates ...

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by AstusAleator
Sun Jun 11, 2006 6:39 pm
 
Forum: Ecology
Topic: Why do a fish contain higher pesticides
Replies: 2
Views: 2901

Energy transfer between trophic levels!!

... were sprayed with DDT, every time the wolf eats something, it will be getting another dose of DDT in its system, and that DDT will never go away. Bioaccumulation is particularly severe in aquatic systems, where bottom-feeders or filter feeders absorb heavy metals such as cadmium or mercury. Top-predator ...

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by AstusAleator
Mon Jan 30, 2006 9:11 pm
 
Forum: General Discussion
Topic: Energy transfer between trophic levels!!
Replies: 2
Views: 3671

Mercury consumption.

@mithril Bioaccumulation: increase in concentration of a pollutant from the environment to the first organism in a food chain Biomagnification: increase in concentration of a pollutant from one link in a food chain to another ...

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by elevatedfly
Tue Oct 25, 2005 4:33 pm
 
Forum: General Discussion
Topic: Mercury consumption.
Replies: 14
Views: 7619

Mercury consumption.

@mithril Bioaccumulation: increase in concentration of a pollutant from the environment to the first organism in a food chain Biomagnification: increase in concentration of a pollutant from one link in a food chain to another

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by MrMistery
Mon Oct 24, 2005 6:21 pm
 
Forum: General Discussion
Topic: Mercury consumption.
Replies: 14
Views: 7619
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