biomagnification


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Related to biomagnification: bioaccumulation

biomagnification

(bī′ō-măg′nə-fĭ-kā′shən)
n.
The increasing concentration of a substance, such as a toxic chemical, in the tissues of organisms at successively higher levels in a food chain.

biomagnification

The result of bioaccumulation and biotransfer by which tissue concentrations of chemicals in organisms at one trophic level exceed tissue concentrations in organisms at the next lower trophic level in a food chain.

biomagnification

(bī″ō-mag″nĭ-fĭ-kā′shŏn) [ bio- + magnification]
The increase in the concentration of biologically active substances in organisms as they rise up the food chain. Pesticides are one example of a substance that biomagnifies. Trace concentrations of agricultural pesticides may be ingested by aquatic organisms, such as plankton. Plankton may be consumed by filter-feeding clams or small fish, which will store larger concentrations of toxins in fat or muscle. These animals may be eaten by predators such as trout or salmon, which may subsequently be consumed by carnivores such as bear, eagles, osprey, or humans. In each successive level of the food chain, higher and higher concentrations of pesticides will be found. Ultimately enough pesticide may be present in individual organisms to cause disease.
References in periodicals archive ?
Evidence of mercury biomagnification in the food chain of the cardinal tetra Paracheirodon axelrodi (Osteichthyes : Characidae) in the Rio Negro, central Amazon, Brazil.
Are the top carnivores endangered by heavy metal biomagnification? Oikos 60: 387-390.
Concentrations and biomagnification of 17 chlordane compounds and other organochlorines in harbor porpoise (Phocoena phocoeria) and herring from the southern Baltic Sea.
Because of their lipophilic characteristics and biomagnification in the food chain [67, 68], PBDEs are predominantly linked to foods of animal origin [65].
Via river discharge or atmospheric deposition, which is the most important pathway for the marginal sea, metals enter into aquatic environments and are continually concentrated in food chain through bioaccumulation and biomagnification [1, 6-8].
Ishaq, "Biomagnification of polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) studied in pike (Esox lucius), perch (Perca fluviatilis) and roach (Rutilus rutilus) from the Baltic Sea," Chemosphere, vol.
Dietary differences among animals at the same trophic level add complexity to assessments of biomagnification of contaminants in terrestrial food webs (van den Brink et al.
Thus there is a serious danger to the fauna and flora due to bioacccumulation, long persistence and biomagnification in the food chains of these pollutants [2].
In [4] It was determined the presence in the milk of pesticides such as organophosphates and triazine product of processes of bioaccumulation and biomagnification, this was performed using techniques of gas chromatography.
These biosolids are creating environmental problems due to 4 basic types of pollutants: 1) Metals, because of their potential to accumulate in human tissues and their biomagnification; 2) Nutrients and organic matter, due to their eutrophication potential in groundwater and surface waters; 3) Organic contaminants, because of their lack of clarity in the ecotoxicology role on soil-plant-water systems; and 4) Pathogens, due to the presence of bacteria, viruses, protozoa, flukes, tapeworms and nematodes [4].
On the other hand pesticides are commonly known by the toxic effects that occur in health, it is for this reason that have developed different studies and have generated measures to curb this, but even so there are multiple factors that make it difficult to proper disposal of these before they are harmful to the health, as are the processes of bioaccumulation and biomagnification.(1)
Bioaccumulation and biomagnification of mercury in African lakes: the importance of trophic status.