BIOACCUMULATION.

Slides:

Advertisements

Similar presentations

BIOACCUMULATION Chapter 2.3.

Advertisements

Bio-Contaminants & Food Webs

Bioaccumulation. The start of the problem Many chemicals we use in our daily lives are toxic. Toxic chemicals include: 1.pesticides, 2.engine products.

Definitions Bioaccumulation Bioaccumulation is the process by which substances not readily broken down or excreted can build up and be stored in living.

What is Bioaccumulation?

BIOACCUMULATION Chapter 2.3. Chemical Pollutants Humans have been introducing synthetic (man-made) chemicals into the environment. Some examples are:

(c) McGraw Hill Ryerson Effect of Bioaccumulation on Ecosystems Amphibians (like frogs) live on both land and in the water.  They are also sensitive.

2.3 Effect of Bioaccumulation on Ecosystems  Amphibians are valuable indicators of environmental health because they’re sensitive to chemical changes.

Lake Trout 4.83 Lake Trout 4.83 PCBs Background Information: PCBs are a collection of substances used to manufacture different items such as plastics and.

Effects of Bioaccumulation on Ecosystems

Effects of Pesticides Discuss the effects continually introducing new pesticides into the environment.

Biological Magnification Biological Magnification: The process of a chemical buildup, increasing in concentration, as it moves up trophic levels of a food.

(c) McGraw Hill Ryerson 2007 Chapter 2 Energy Flow & Nutrient Cycles 2.3 Effects of Bioaccumulation on Ecosystems p Words to Know: Bioaccumulationkeystone.

Food Chain and Food Web Review….. Q: Primary Producers? Primary consumers? Secondary consumers? Tertiary consumer?

Pesticides SNC1D. Pest Pests are living organisms that are not wanted around us. Examples of pests include unwanted dandelions growing in the lawn; rodents.

Today, 3/13/14 Notes – Bioaccumulation/Biomagnification Operation: Cat Drop Activity Individual work Review Exit Slip Notes – Bioaccumulation/Biomagnification.

Bioaccumulation and Biomagnification Tracing Pollution Through An Ecosystem.

2.3 Effect of Bioaccumulation on Ecosystems

SCIENCE 10 O2 Pesticides and DDT. What are Pesticides? PESTICIDES: chemicals that are designed to kill pests. PEST: any organism that people consider.

Persistent Organic Pollutants (POPs)

Advanced Higher DDT.

Ecosystem Threats Ecosystems Unit, March 21 st 2005.

Persistent Organic Pollutants (POPs) Mel Jordan & Taylor Park.

Definitions Bioaccumulation Bioaccumulation is the process by which substances not readily broken down or excreted can build up and.

Environmental Health, Pollution, and Toxicology

Warmup- Symbiosis Worksheet Get out Homework and turn it in!! Essential Question- What happens when humans introduce chemicals into the environment?

2.3 Effect of Bioaccumulation on Ecosystems  Amphibians are valuable indicators of environmental health because they’re sensitive to chemical changes.

2.3 Effect of Bioaccumulation on Ecosystems

Bioaccumulation. Bioaccumulation  Accumulation of chemicals in an ecosystem  Higher and higher concentrations accumulate in organisms  Chemicals ingested.

The Need for Pest Control Any organism that has a negative effect on human health or economics Any organism that is noxious, destructive, or troublesome.

2.3 - Effect of Bioaccumulation on Ecosystems Amphibians (ie. frogs) live both on land and in water. They are sensitive to chemicals changes in the environment,

Health Risk and Toxins Essential Question: how do we determine what is harmful to us?

Energy Flow in Ecosystems. How does energy flow in an ecosystem? Energy flow is the transfer of energy from one organism to another in an ecosystem. Every.

Get out your HW & In your notes… Do you think that we should use pesticides? What applications do you believe pesticides are acceptable for, if any?

The student is expected to: 11B investigate and analyze how organisms, populations, and communities respond to external factors; 12C analyze the flow.

Bioaccumulation 2.3 part 2 of 2.

Pests and Pest Control.

IMPACT OF HUMAN ACTIVITY

Water Quaility Video Water Quality in NC.

Bioaccumulation.

Bioaccumulation and Biomagnification

2.3 Effect of Bioaccumulation on Ecosystems

Bioaccumulation and Biomagnification

BIOACCUMULATION.

Cycles & Bioaccumulation

2.3 Effect of Bioaccumulation on Ecosystems

Biological Magnification

Water Pollution Day 3: Source & Impacts.

Pesticides Pesticides are chemicals designed to kill pests.

PREVENTING HABITAT POLLUTION AND DESTRUCTION

2.3 Effect of Bioaccumulation on Ecosystems

Topic 4 How organisms react.

2.3 Effect of Bioaccumulation on Ecosystems

Bioaccumulation & Biomagnification

Bioaccumulation S Describe bioaccumulation and explain its potential impact on consumers. Examples: bioaccumulations of DDT, lead, dioxins, PCBs,

By Vinodkumar Kushawaha SATISH PRADHAN DNYANASADHANA COLLEGE, THANE(W)

Biomagnification and Bioaccumulation

Effect of Bioaccumulation on Ecosystems

Pests and Pest Control.

Racheal Carson, “Silent Spring”

Back in 1987 there was some concern over the health of women in an industrial neighbourhood of Quebec City.

Grade 7 Interactions and Ecosystems

What is bioaccumulation?

Science 9 Unit 4: Ecology Lesson 3: Food Chains/Web & Bioaccumulation/Biomagnification.

FLOW OF ENERGY AND NUTRIENTS WITHIN ECOSYSTEMS

Bioaccumulation And Biomagnification.

Energy Flow Through Ecosystems

6.3 - Hazards and Benefits of compounds

Presentation transcript:

BIOACCUMULATION

The problem begins with us… Humans have been introducing synthetic (man-made) chemicals into the environment. PCBs are used widely in products such as paints, plastics. They interfere with the immune function of an organism and make them more susceptible for disease. Examples: PCBs (polychlorinated biphenyls) widely used in paints, plastics, lubricants up to 1977 Pesticides Engine products Household cleaning agents DDT (an insecticide for mosquitos) now banned in many countries Heavy metals such as mercury, cadmium, lead etc.

Persistent organic pollutants' (POPs) Some of these toxins are persistent… Persistent organic pollutants' (POPs) Take a long time to break down! Half-life (PCBs) = 8 -10 years Half-life (DDT) = 15 years http://www.youtube.com/watch?v=bmo7qd6-0Ag

Bioaccumulation = the accumulation of a contaminant or toxin in or on an organism from all sources (e.g., food, water, air). Why does this happen though? This occurs if compounds are taken up and stored faster than they are broken down (POPs). Or if they are non-biodegradable.

Biomagnification = the increase in concentration of toxin as it passes through successive levels of the food web

DDT DDT was first used in WWII to protect against diseases such as typhus and malaria. It is cheap and effective as an insecticide – so it began to be manufactured for home use. Before it was banned in 1972 by the EPA for use in agriculture, 1,350,000,000 pounds of DDT had been made in North America. http://www.youtube.com/watch?v=-UiCSvQvVys

How does DDT get to organisms? Is able to get into the waterways by runoff from pesticides, runoff from fertilizers, seepage and dispersal and sedimentation from land clearance and erosion Effects of DDT: Causes reproductive disorders Weakens the shells of eggs (eggs break or do not hatch) Can also cause nervous system/ immune system disorders in animals DDT is still used in places such as Zimbabwe and Ethiopia to control mosquities and the tsetse fly. These two insects cause serious diseases such as malaria and sleeping sickness.

The effects of Bioaccumulation: Reproductive failure Birth defects Immune system disorders (cancers and weakness to disease) Behaviour and learning disorders Death

Prac #8: A little goes a long way