Opening Questions .

Uploaded on:
Opening Questions. Name two kinds of bias. Name three sources of bias. What are some important aspects of DDT?. Lesson 1 Review Points. Using Science as Evidence When science is used as evidence it is important to identify possible sources of bias.
Slide 1

Opening Questions Name two sorts of inclination. Name three wellsprings of inclination. What are some critical parts of DDT?

Slide 2

Lesson 1 Review Points Using Science as Evidence When science is utilized as confirmation it is essential to distinguish conceivable wellsprings of predisposition. Inclination might be because of testing predisposition or estimation predisposition. Foundation of DDT is a pesticide utilized for mosquito control and irritation control in rural products. DDT gathering in some flying creature species brought about death, sensory system harm, and regenerative disappointment. Accordingly DDT was banned in the United States in 1972.

Slide 3

What are a few wellsprings of predisposition? Applying the consequences of a concentrate too comprehensively (summing up) Taking exploration comes about outside of any relevant connection to the subject at hand Not taking an irregular specimen Taking too little of an example Measurement blunder

Slide 4

Lesson 2 Food Webs, Bioaccumulation, and Visualizing Data

Slide 5

What sort of harm can DDT bring about to flying creatures?

Slide 6

In the body of a creature, DDT is changed (metabolized) to DDE. DDE breaks down in fat, not in water, and is put away in greasy tissues. In this manner, DDE has a tendency to stay in the body and can bring about a few issues.

Slide 7

DDE: Kinds of Damage Reproductive disappointment (in winged animals eggshell diminishing) Immune framework issues Nervous framework harm Death

Slide 8

How does DDT move into lakes, streams and seas?

Slide 9

After DDT is connected, some DDT volatizes, some remaining parts on the plant, and a few washes off the plant into the dirt, in the long run advancing toward an a stream, waterway, or lake. The DDT that remaining parts on the leaves of plants might be ingested by essential customers, for example, bugs and rodents. DDT that has washed into a waterbody, stays in the dregs or is devoured by base encouraging life forms or consumed by fish gills and skin.

Slide 10

Is DDT still utilized today?

Slide 11

YES DDT is still utilized as a part of a few nations for creepy crawly control on products. In nations where mosquitoes convey jungle fever, DDT is as of now utilized for mosquito control.

Slide 12

What is a Food Web?

Slide 13

Food Web = A rundown of the nourishing connections inside an environmental group. Osprey Sucker Trout Silverside Bay Shrimp Water Plants ORGANIC DEBRIS Plankton

Slide 14

Food Chain = One string of the nourishment web Osprey Large Mouth Bass Crayfish ORGANIC DEBRIS

Slide 15

Cast of Food Web Characters Tertiary Consumers – Animals that eat creatures that eat creatures Secondary Consumers – Animals that eat creatures that eat plants Primary Consumers – Animals that eat plants Primary Producers – Plants and Phytoplankton: life forms utilizing the sun for vitality

Slide 16

Why is sustenance web information vital for comprehension the effect of DDT on ospreys and birds?

Slide 17

Ospreys and hawks are t ertiary purchasers and this makes them especially defenseless against DDT due to bioaccumulation and biomagnification .

Slide 18

What is bioaccumulation?

Slide 19

Bioaccumulation = the gathering of a contaminant or poison in or on a living being from all sources (e.g., nourishment, water, air). An expansion in the centralization of a substance in a natural living being after some time, contrasted with the concoction\'s focus in the earth. Mixes amass in living things at whatever time they are taken up and put away speedier than they are separated (metabolized) or discharged.

Slide 20

What is biomagnification?

Slide 21

Biomagnification = the expansion in grouping of poison as it goes through progressive levels of the nourishment web DDE gathers at more elevated amounts in life forms that are higher in the natural pecking order

Slide 22

Biomagnification of a DDE in Aquatic Environment Amount of DDE in Tissue Level Tertiary Consumer 3-76 µg/g ww (angle eating fowls) Secondary Consumers 1-2 µg/g ww (extensive fish) Primary Consumers (little fish) 0.2-1.2 µg/g ww Primary Producers (green growth and sea-going plants) 0.04 µg/g ww

Slide 23

Considering biomagnification, how could DDE hurt an osprey?

Slide 24

Osprey Food Web DDE Concentration 3-76 µg/g ww Osprey Large Mouth Bass 1-2 µg/g ww 0.2-1.2 µg/g ww Crayfish Plant material and green growth 0.04 µg/g ww

Slide 25

Units of Measurement 1 gram = 1000 milligrams (mg) = 1,000,000 micrograms (µg) microgram (µg) = one millionth of a gram To depict focuses: µg/g = number of micrograms (of poison) per gram (of tissue) 2 µg/g DDE in egg content means there is 2 sections of DDE in 1,000,000 sections of an egg substance ww or wet weight alludes to the new weight of creature tissue. dw or dry weight alludes to the heaviness of creature tissue after it has been dried in a 65 °C stove to evacuate all the water.

Slide 26

The Effects of DDE on Reproduction Wiemeyer, S.N. et al., 1984. Organochlorine pesticide, polychlorobiphenyl, and mercury buildups in bald eagles, 1969-1979, and their relationship to shell diminishing and multiplication. Curve. Environ. Contam. Toxicol., 13, 529. Johnson, D.R. et al., 1975. DDT and PCB levels in Lake Coeur d\'Alene, Idaho osprey eggs, Bull. Environ. Contam. Toxicol., 13, 401.

Slide 27

High levels of DDE cause the female ospreys to lay eggs with thin eggshells. Thin eggshells have a more prominent possibility of breaking, prompting fetus passing. With elevated amounts of DDE, female ospreys can likewise lay eggs that contain sufficiently high convergence of DDE to anticipate incipient organism advancement.

Slide 28

How is the effect of DDE on osprey and falcon generation measured?

Slide 29

One Method for Measuring the Impact of DDE on Osprey Reproduction Collect eggs from surrendered osprey homes. Measure the thickness of the eggshells. Measure the measure of DDE in the egg. Decide the relationship between eggshell thickness and DDE buildup.

Slide 30

Visualizing the Data

Slide 31

If expanded DDE fixations causes expanded eggshell diminishing, how might you draw a diagram demonstrating the relationship between eggshell diminishing and DDE focus?

Slide 33

If DDE has no effect on eggshell thickness, what relationship would you hope to see between DDE levels and eggshell thickness?

Slide 35

If expanded levels of DDE are connected with expanded eggshell thickness, how might you make a chart demonstrating the relationship between eggshell thickness and DDE focus?

Slide 37

DDE lessens regenerative rates at direct focuses. At high fixations it causes add up to regenerative disappointment. How might you make a diagram demonstrating the relationship between DDE focus and conceptive achievement?

View more...