Ddt bioakkumulation

In your textbook, Cox reports on a study done in 1967 on Long Island Sound. The levels of DDT in tissues of various animals in the sound showed bioaccumulation factors of 800x, and biomagnification factors up to 31 times. When we look at the whole food chain, the overall magnification is over 200,000x Bioaccumulation is the gradual accumulation of substances, such as pesticides, or other chemicals in an organism. Bioaccumulation occurs when an organism absorbs a substance at a rate slower rate than that at which the substance is lost by catabolism and excretion.Thus, the longer the biological half-life of a toxic substance, the greater the risk of chronic poisoning, even if environmental. Explore biomagnification which can happen when toxins become more highly concentrated when moving up through trophic levels in the food chain. Uncontrolled use of DDT is used in video as an. DDT is thought to biomagnify and biomagnification is one of the most significant reasons it was deemed harmful to the environment by the EPA and other organizations. DDT is stored in the fat of animals and takes many years to break down, and as the fat is consumed by predators, the amounts of DDT biomagnify. DDT is now a banned substance in. The word bioaccumulation is used to describe the build up of chemicals in fish. Through the food chain, chemicals like PCBs, DDT, dioxins, and mercury build up in the bodies of the fish. The picture below shows how this might happen in a lake near you. People are at the top of this food chain. When yo

BIOACCUMULATION / BIOMAGNIFICATION EFFECTS. Persistent Organic Chemicals such as PCBs bioaccumulate. This diagram shows the degree of concentration in each level of the Great Lakes aquatic food chain for PCBs (in parts per million, ppm). The highest levels are reached in the eggs of fish-eating birds such as herring gulls USGS Data Exploration Unit: Lesson 2 Activity Food Webs and Bioaccumulation (KEY) food chain. Terrestrial organisms can and do suffer from DDT contamination. However, DDT does not remain on land the way it collects in water ecosystems. Thus land organisms tend to be exposed to less DDT over time and concentrate less DDE in their tissues How to create a 3D Terrain with Google Maps and height maps in Photoshop - 3D Map Generator Terrain - Duration: 20:32. Orange Box Ceo Recommended for yo DDT and Birds . Birds played a major role in creating awareness of pollution problems.Indeed, many people consider the modern environmental movement to have started with the publication in 1962 of Rachel Carson's classic Silent Spring, which described the results of the misuse of DDT and other pesticides Another great example of chemical biomagnification is the story of the insecticide DDT. This chemical was made popular in the early 1940's by its success in controlling mosquitoes. By the 1960's, biomagnification of DDT had occurred to such a degree that bird populations (including the bald eagle) were beginning to suffer

Bioaccumulation & Biomagnificatio

DDT accumulates in human fatty tissue (including breast milk) as well and may thus have long-term health effects from chronic exposure. DDT is thought to be a human carcinogen; it can also mimic estrogen and may thus disrupt endocrine activity. DDT was banned for all but emergency public health uses in the United States in 1972 DDT. DDT is a chemical pesticide which was used by farmers to control insect pests eating their crops. It can be used to demonstrate bioaccumulation as shown in this diagram

Bioaccumulation - Wikipedi

  1. Bioaccumulation and Biomagnification Lab adapted from Mr. Shuskey, Perry, NY. Objectives: After completing this lab a student will be able to Define and describe bioaccumulation. Define and describe biomagnification. Predict the effects of bioaccumulation and biomagnification at various levels of the food web
  2. Bioaccumulation and biomagnification are two different processes that often occur in tandem with one another.Bioaccumulation is the process by which toxins enter the food web by building up in individual organisms, while biomagnification is the process by which toxins are passed from one trophic level to the next (and thereby increase in concentration) within a food web
  3. ants, in biological tissues by aquatic organisms, from sources such as water, food, and particles of suspended sediment (Wang and Fisher, 1999)
  4. Effects of Hydrocarbon and DDT Bioaccumulation. During an oil spill, hydrocarbons called polycyclic aromatic hydrocarbons (PAHs) can accumulate in sea animals. PAHs have been linked to cancer in humans that eat fish and shellfish and adversely affect survival, growth and ability to fight disease.
  5. • Invite students to read Chapter 6 from the book Our Stolen Future (1996) by Theo Colburn, Dianne Dumanoski, and John Peterson Myers. This chapter traces the path a PCB molecule takes from its place of manufacture in the US to the fatty tissue of a polar bear living in the arctic
  6. Biomagnification of DDT. Because of DDT's chemical properties, it has the tendency to accumulate in animals. As animals lower on the food chain are eaten by other animals higher up, DDT becomes concentrated in the fatty tissues of predators. This continues until the primary predator of the food.
  7. Bioaccumulation Worksheet Read Section 2.3 Effects of Bioaccumulation on Ecosystems (Pages 92-99) in your textbook and answer the following questions. 1. What are amphibians and how are they useful to scientists? 2. List all the causes of amphibian species loss. 3. What are pesticides? 4

Biomagnification and the Trouble with Toxins - YouTub

Biomagnification Bio Accumulation Concentration - Blue Growt

Get an answer for 'How did DDT affect fish and bird populations?' and find homework help for other Science questions at eNote DDT was popular after World War II. What is the effect of DDT? In 1970's it was discovered DDT entered the food chain - fish ate insects that were sprayed with the chemical; hawks, eagles, and pelicans (non target population - what we didn't mean to hurt but we did) ate the fish. What is the effect of DDT Food Chains and DDT Bioaccumulation. DDT was one of the first chemicals in widespread use as a pesticide. Following World War II, it was promoted as a wonder-chemical, the simple solution to pest problems large and small. Today, nearly 40 years after DDT was banned in the U.S., we continue to. Biological magnification often refers to the process whereby certain substances such as pesticides or heavy metals move up the food chain, work their way into rivers or lakes, and are eaten by aquatic organisms such as fish, which in turn are eate.. The population of these birds plummeted. DDT was finally banned in the United States in 1972, and since that time there have been dramatic increases in the populations of many predatory birds. The bioaccumulation and biomagnification of toxic contaminants also can put human health at risk

While DDT isn't particularly lethal (except to insects, and we need many of them around), it has a number of sub-lethal effects. Most prominent is the phenomenon of shell-thinning in birds, particularly carnivorous birds (raptors) - birds that eat other birds, birds that eat carrion (dead animals), and birds that eat fish You have studied and modeled bioaccumulation of toxins in organisms. Many people don't understand what that means. A few people may know that some fish contain mercury, they don't really understand why. The Arctic is a remote and pristine place, yet the concentration of toxins in the wildlife is very high Estimating Bioaccumulation: DDT in a Lake (Note: this is a hypothetical example.) A medium sized lake can serve as a major food source for a subsistence community. Suppose that a community of about 100 people gets much of its protein from fishing on such a lake. Every day, each person eats one or two fish, which weigh on average about 150 grams Lake Malawi, an East African Rift Valley lake, is internationally renowned for having the highest diversity of fish species in the world, and these cichlids are highly specialized in their dietary habits. In this lake, tissue stable carbon (δ13C) and nitrogen (δ15N) isotopes can be used over several trophic levels to distinguish those consumers relying upon carbon fixed by either benthic or. Biomagnification is a specific case of bioaccumulation and is different from bioconcentration. Bioaccumulation describes the accumulation of contaminants in the tissue of organisms. Typical examples of this include the elevated levels of many chlorinated pesticides and mercury in fish tissue. Bioconcentration is used to describe the.

In this lesson, you will learn about the persistence and magnification of toxicants in the environment. You will also learn about how these toxicants affect organisms as they move up the food chain 7. Estimating Persistence, Bioaccumulation, and Toxicity Using the PBT Profiler 7-2 Development The PBT Profiler was developed by EPA through a collaborative effort with the American Chemistry Council (ACC), the Society of Chemical Manufacturers and Affiliates (SOCMA), the Chlorine Chemistry Council (CCC), and Environmental Defense bioakkumulation, levende organismers ophobning af miljøgifte fra omgivelserne. Hvis organismerne optager mere, end de udskiller, sker der en bioakkumulation. Bioakkumulation betegner dels biokoncentration, dvs. at koncentrationen af en miljøgift bliver større i en levende organisme end i dens omgivelser, dels biomagnifikation, dvs. at ophobningen af miljøgiften kan forstærkes op gennem.

DDT was banned from use in the United States in 1972, and remains banned barring public health emergency (e.g., outbreak of malaria) . INTRODUCTION DDT is an organochlorine insecticide used mainly to control mosquito-borne malaria; use on crops has generally been replaced by less persistent insecticides Worksheet and slides for a brief 30 min lesson quickly covering bioaccumulation of DDT for KS3 Science. Print the worksheet doublesided and you only have a single sheet to give out containing an extension comprehension task. Could be easily adapted or ext.. Once in the marine environment, chemical substances can accumulate over time (known as bioaccumulation), and/or with each step up in the food chain their concentration can increase in the tissue and body fat of large bodied animals (known as biomagnification). Most of the hazardous waste is from the terrestrial environment 'Bioaccumulation' is the process whereby contaminants, often man-made chemicals, build up in the fatty tissue of organisms. 'Biomagnification' occurs when smaller organisms are eaten by larger predator and these toxins increase in higher trophic levels of the food chain/web. The pesticide DDT, the compound PCB foun The key difference between bioaccumulation and biomagnification is that bioaccumulation refers to the build-up of a toxic chemical in the body of a living organism while biomagnification is the increase of the concentration of a toxic chemical when going along a food chain.. Food chains are important interrelations among the organisms in the ecosystems

DDT, PCB's, methyl mercury and many other organic substances fall into this category. Storage in fat is not the only location in which this bioaccumulation can occur. Take Strontium-90 as an example, strontium-90 is known to manipulate the same properties as calcium which is used for treatment for bone cancer, because it mimics calcium in the. Teacher Biomagnification and DDT poisoning is a classic example of how interference in natural ecosystems can cause unexpected results. Relay to your class the story behind Operation Cat Drop and discuss the problems and solutions. Then look at other ways we effect ecosystems. (i.e.: oil spills, dumping trash, etc.) Difference Between Bioaccumulation and Biomagnification. The Bioaccumulation Threat. Mercury bioaccumulation in fish is a cause of concern, as mercury is also known to bioaccumulate in humans, and fish is an important constituent of our diet

The influence of worm density on DDT toxicity and bioaccumulation was examined by exposing one or five worms per beaker (74 and 370 worms/m 2, respectively) to spiked sediment. Although higher body residues were attained under low density, worms exposed in groups of five were significantly more sensitive to the effects of DDT on growth Bioaccumulation of Heavy MetalsSome of the substances that make up Earth's crust are elements, substances that cannot be naturally broken down into simpler substances. A few of these elements are poisonous even if present in a low concentration. These are known as heavy metals. Examples of heavy metals include mercury, cadmium, arsenic, chromium, thallium, and lead Bioaccumulation occurs when toxins build up - or accumulate - in a food chain. The animals at the top of the food chain are affected most severely. DDT is an insecticide that was widely used in. For example, DDT is accumulated in the fat reserves of birds, where it can reach quite high levels. (DDT, dichloro-diphenyl-trichloroethane, was the first widely used synthetic pesticide and has been used to kill agricultural and domestic insect pests since 1939; see Section 4.2.) This has two important effects What is Biomagnification? - Definition & Examples. One of the most famous cases of biomagnification is the one involving DDT, which is a pesticide that was historically used for mosquito.

Bioaccumulation and Biomagnification Animation 2 - YouTub

Biomagnification factor calculation? (Fish bioaccumulation). were the first to demonstrate this with a very clever mathematical model for DDT and showed that body-size alone could account. The use of DDT or Dichlorodiphenyltrichloroethane has been banned in Australia since 1987. Twenty years on, Glen Johnson from the Department of Sustainability and. Both DDT and PCBs are called persistent organic pollutants (POPs) This is because they take a LONG time to break down ; HALF-LIFE the time it takes for ½ the substance to break down; Half-life (PCBs) 8 -10 years Half-life (DDT) 15 years. 15 Bioaccumulation. Bioaccumulation is the build-up of chemicals in living organisms

DDT and Birds - Stanford Universit

  1. DDT and its metabolites have been detected in food from all over the world and this route is likely the greatest source of exposure for the general population. DDE was the second most frequently found residue (21%) in a recent survey of domestic animal fats and eggs in Ontario, Canada, with a.
  2. Bioaccumulation is a normal process that can result in injury to an organism only when the equilibrium between exposure and bioaccumulation is overwhelmed, relative to the harmfulness of the chemical. Sometimes bioaccumulation can be a protective mechanism in which the body accumulates needed chemicals
  3. The Cautionary Tale of DDT - Biomagnification Bioaccumulation and biomagnification. (Image ©WWF) Health & Environmental Consequences. The persistence of DDT in the environment and the bioaccumulation and biomagnification of this compound has led to serious health effects in many organisms
  4. Bioaccumulation represents the build-up gathering over time of a chemical in a living creature. Usually, this happens when a certain chemical is processed by the body faster than it can be used. However, understanding what is bioaccumulation also relies on a different explanation
  5. Can toxic bioaccumulation be prevented? Honor Society of Nursing (STTI) It is difficult to totally avoid the bioaccumulation of toxic substances in the developed world. In the last century, tens of thousands of new chemicals have been formulated and, in the United States, billions of pounds of.
  6. DDT begins to bioaccumulate in plants and then in the fatty tissue of the fish, birds, and animals that eat the plants. Washed into streams and lakes, it affects aquatic food chains by first accumulating in plankton. In Table 2.2, you can see how low levels of DDT become magnified through the food chain

biomagnification. The top preditors at the end of the food chain, such as large trout, salmon and fish-eating gulls may accumulate concentrations of a toxic chemical high enough to result in serious deformities or death. Further biomagnification occurs in birds, other animals, and humans that consume fish Name: _____ Date: _____ Science 10: Ecosystems Bioaccumulation and Biomagnification Worksheet Introduction: Imagine a pond near a farmer's field that is infested with harmful insects. The farmer sprays the field with DDT. Wind blows some of the pesticide onto the marsh plants

Facts about Bioaccumulation 7: the food web. Bioaccumulation is dangerous for the ecosystem because the organism which has PBT is still a part of the food chain and ecosystem. Facts about Bioaccumulation 8: a defense. Bioaccumulation is used by some animals to perform a defense mechanism from the predators With the uncertainty surrounding the Zika virus, which could turn to panic if it reaches epidemic proportions in the U.S., mosquito control may become more important than ever. Although it hasn't been used here since 1972, DDT is creeping into discussions about how to contain the virus. It's unlikely to be used, but in the meantime we ask: What is DDT

How Bioaccumulation and Biomagnification of Pollutants Is

  1. Name%_____% Date_____% % Data:% Toxic%algae%accumulate%in%the%bodies%of%animals%that%eat%them.%If%as%much%as%25%%ofthefooda
  2. America's favorite symbol is the glorious bald eagle. The bald eagle lives across the country and is endangered. This story goes back to 1962 and the publication of Rachel Carson's Silent Spring, which detailed the effects of pesticides. In particular, Carson focused on DDT, widely used to combat disease-carrying insects
  3. The most famous was the case of DDT and egg-shell thinning in birds of prey. It was claimed that the widespread use of DDT was the main cause for the decline of birds of Prey in the 1960's. This has led to a ban on the use of DDT Read the following articles. Article 1 - DDT, Eggshells, and Me - Ronald Baile

One study of DDT levels showed that where soil levels were 10 parts per million (ppm), DDT reached a concentration of 141 ppm in earthworms and 444 ppm in robins. Though the concentration of a chemical may be low in the air, water, or soil, biomagnification can lead to death or adverse effects on behavior, reproduction insect resistance to pesticides, bioaccumulation, and biomagnification. By the 1960's, global problems with DDT and other pesticides were becoming so pervasive that they began to attract much attention. Credit for sounding the warning about DDT and biomagnificatio Bioaccumulation kinetics and bioconcentration factor (BCF) of chlorinated pesticides like Aldrin, Dieldrin, Benzene hexachloride (BHC), and Dichlorodiphenyl-dichloro-ethane (DDT) in fish tissues of Puntius ticto was studied in detail in a continuous fed system This is known as bioaccumulation or biomagnification. DDT (dichlorodiphenyl-trichloroethane) was the first commonly used insecticide. DDT was relatively inexpensive to manufacture and had long-lasting effects. DDT enters aquatic environments by attaching itself to the surfaces of plankton or accumulating in the cells of these organisms. DDT i Ospreys and eagles are tertiary consumers and this makes them particularly vulnerable to DDT because of bioaccumulation and biomagnification. What is bioaccumulation? Bioaccumulation = the accumulation of a contaminant or toxin in or on an organism from all sources (e.g., food, water, air)

THE BIOACCUMULATION OF METHYLMERCURY IN AN AQUATIC ECOSYSTEM N. JOHNS, J. KURTZMAN, Z. SHTASEL-GOTTLIEB, S. RAUCH AND D. I. WALLACE Department of Mathematics, Dartmouth College, HB 6188 Hanover, NH 03755, USA E-mail: Dorothy.Wallace@Dartmouth.edu A model for the bioaccumulation of methyl-mercury in an aquatic ecosystem is described 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 The amount of DDT found in the osprey with the amount found in one phytoplankton are vastly different to say the very least. In phytoplankton, the average amount of consumed DDT is about 0.28 ppm. This contrasts greatly to the one measured from the osprey, for they have the total amount of 28 ppm of DDT ingested within its body This lesson discusses the topic of biomagnification and bioaccumulation. Sign up now. to enroll in courses, follow best educators, interact with the community and track your progress. Home Explore Plus. Login Signup (Hindi) Complete Environment & Ecology for UPSC Biomagnification definition, biological magnification. See more. Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 201

Biomagnification - an overview ScienceDirect Topic

Bioaccumulation and human health risk assessment of DDT and other organochlorine pesticides in an apex aquatic predator from a premier conservation area. Gerber R(1), Smit NJ(2), Van Vuren JH(3), Nakayama SM(4), Yohannes YB(4), Ikenaka Y(5), Ishizuka M(4), Wepener V(2) Bioakkumulation als physiologischer Vorgang. Die Bioakkumulation kann sich auf eine chemische Verbindung beziehen (etwa DDT), auf ein chemisches Element (etwa Blei), auf ein Isotop (etwa 90 Sr, das radioaktive Strontium-90) oder auf besonders kleine Teilchen (sog. Nanopartikel).Bioakkumulationen treten vorwiegend bei Substanzen auf, die eine lange biologische Halbwertszeit besitzen, die also. riverside secondary

In the paper Mercury bioaccumulation in the spotted dogfish (Scyliorhinus canicula) from the Atlantic Ocean by Coelho et al., 2010, scientists looked at the bioaccumulation pattern in different tissues in the spotted dogfish and the risks associated with its consumption because it is an ecologically important species Biomagnification Bioaccumulation Depicted here is a representation of bioaccumulation in a Northern ecosystem. Northern populations may be uniquely susceptible to bioaccumulation of certain toxicants because of their culture, lifestyle and diet Bioaccumulation and metabolism ofp,p′-DDT was studied in the marine carnivorous fishLates calcarifer, Asian seabass, in a controlled aquaculture experiment. Over a 42-d period, seabass were fed pellets dosed withp,p′-DDT at environmentally realistic levels. Virtually allp,p′-DDT in pellets bioaccumulated in the fish with an uptake efficiency of 98%

Ecosystems - pollution and nutrient cycles - WJEC - Revision

  1. DDT, DDE, PCBs and PBDEs are all _____ DDT, DDE, PCBs and PBDEs are all _____. A biodegradable and do not persist in the environment B toxic at the organism level but not at the ecosystem level C teratogens non-biodegradable and subject to bioaccumulation and/or bioamplification D approved for use as pesticides by the EP
  2. Biomagnification And Ddt Answer Key graphs and biomagnification, students complete a Think-Pair-Share activity to Ecosystem and Landscape Factors Influencing Lesson 2: Food Webs, Bioaccumulation, and Visualizing Dat
  3. (11). Unfortunately DDT was so extensively applied that some of the target insects developed resistance. By 1984 as many as 233 species of insects were resistant (13). Concerns about its persistence in the environment and possible health effects from bioaccumulation (9), (13) led to restrictions and bans throughout the world. Countrie
  4. Finally, one must consider the role of the individual citizen-improperly dumped hazardous waste, chemical-based pharmaceuticals (antibiotics, anti-depressants, hormones, etc.) excreted into the waste stream, overuse of pesticides and herbicides, etc.-to understand fully the causes for the skyrocketing rates of absorption and bioaccumulation
  5. Biology-online is a completely free and open Biology dictionary with over 60,000 biology terms. It uses the wiki concept, so that anyone can make a contribution
  6. Bioakkumulation DDT - ein Beispiel für Bioakkumulation Wie wirkt sich DDT auf die Umwelt aus? Geschichte des DDTs Gesarol ; Neocid DDT Verbot Rachel Carson: The Silent Spring USA Ausnahme für Entwicklungsländer Anreicherung im Fettpolster Auswirkungen auf die Umwel
  7. 2.4 How much PCBs are found in the environment? In outdoor air, average PCB concentration varies between urban and rural locations, and other locations distant from PCB sources. For example, the average PCB concentration measured in a series of North-American cities (5 ng/m 3) was 5 to 20 times higher than at two rural locations

Bioaccumulation and Biomagnification: Increasingly

They enter the organism through contaminated air, water, or food and are very slowly metabolized or excreted .Bioaccumulation vs._Biomagnification 1. Bioaccumulation is the concentration of pollutant from the environment which occurs within a trophic level, i.e. one level of a food chain, usually the first organism in the food chain 2 Bioaccumulation definition, biological accumulation. See more. Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 201 DDT that stands for Dichloro Diphenyl Tricholoro Ethane is the most commonly known pesticide. DDT is helpful in killing pests like mosquitoes, fleas, house flies and bugs. On a long run, DDT has proven to be harmful to both man and environment. *DDT sprayed in farms get settled in the soil As the dangers of DDT became known, in large part due to the 1962 publication of Rachel Carson's book Silent Spring, the Environmental Protection Agency took the historic and, at the time, controversial step of banning the use of DDT in the United States. That was in 1972, and it was the first step on the road to recovery for the bald eagle In 2014, a forensic study of bird carcasses that had been exposed to DDT, a toxic and persistent organophosphate, revealed liver and brain abnormalities, even though DDT has been banned since 1972. Exposure to DDT and subsequent bioaccumulation can also impact normal functioning

Bioaccumulation - an overview ScienceDirect Topic

  1. Bioaccumulation and bioconcentration result in these substances remaining in the organisms and not being diluted to non-threatening concentrations. The success of top predatory-bird recovery (bald eagles, peregrine falcons) in North America following the ban on DDT use in agriculture is testament to the importance of biomagnification
  2. Pesticides and Bioaccumulation Pesticides - a substance used for destroying insects or other organisms harmful to ! !plants or to animals. Example:!DDT History of DDT Use • Pesticide used after WWII, often called the ʻatomic bomb of insect killers.
  3. Suppose DDT was sprayed on water. There are millions of planktons in the water. Each of them absorbed 5ppm of DDT. Since they cannot digest DDT, it remains unprocessed in their body. A fish eats 8 such planktons, so it gets 8 x 5 =40 ppm of DDT in its body. A bird eats 50 such fishes, so bird gets 40 x 50 =2000 ppm of DDT in its body
  4. Bioaccumulation is the steady build up over time of a chemical in a living organism. This occurs either because the chemical is full up faster than it can be used, or because the chemical cannot be kaput down for use by the organism that is, the c..

Bioaccumulation is the gradual accumulation of substances, such as pesticides, or other chemicals in an organism. Bioaccumulation occurs when an organism absorbs a substance at a rate faster than that at which the substance is lost by catabolism and excretion Bioconcentration is the intake and retention of a substance in an organism entirely by respiration from water in aquatic ecosystems or from air in terrestrial ones.Bioaccumulation is the intake of a chemical and its concentration in the organism by all possible means, including contact, respiration and ingestion Bioaccumulation is the accumulation of substances, such as pesticides, or other chemicals in an organism. Bioaccumulation occurs when an organism absorbs a substance at a rate faster than that at which the substance is lost by catabolism and excretion.Thus, the longer the biological half-life of a toxic substance, the greater the risk of chronic poisoning, even if environmental levels of the. An important process through which chemicals can affect living organisms is bioaccumulation. Bioaccumulation means an increase in the concentration of a chemical in a biological organism over time, compared to the chemical's concentration in the environment DDT finally linked to human health problems. 13 July 2001 By Emma Young. Pregnant women exposed to the insecticide DDT are much more likely to give birth prematurely, or to full-term but low birth. Biomagnification is definitely dependent on the number of trophic levels but bioaccumulation happens to all organisms regardless of the trophic level the organism is in. Bioaccumulation occurs within one organism whereas biomagnification occurs across multiple trophic levels. Thus, the answer to the question is going to depend on which term you're thinking about