Chaper 3

Question 1

Where do chemicals accumulate

Answer 1

In fat tissue and organs

Question 2

How do we measure chemical accumulation

Answer 2

Ppm parts per million

Question 3

Keystone species

Answer 3

Are species that greatly affect population numbers and the health of an ecosystem

Question 4

Biomagnification

Answer 4

Chemicals not only accumulate but become more concentrated at each tropic level

Question 5

PCBs

Answer 5

Polychlorinated Biphenyls

Widely used in the 1970s banned because accumulate and mag

Question 6

POPs

Answer 6

Persistent organic matter
Contain carbon and remain in water and soil for many of years
Example DDT

Question 7

Heavy metals

Answer 7

Accumulate and mag. They are toxic at low concentration. Found in air, water.
Example Mercury lead cadmium

Question 8

Bioremediation

Answer 8

Living organisms do the clean up naturally by biodegradation

Question 9

Half life

Answer 9

Is the time it takes for the amount of chemical to decrease by half

Question 10

PCBs and orcas

Answer 10

Affect top groups
Escalating orcas
In blubber, burn blubber, in blood

Question 11

Natural selection

Answer 11

Is the process where individuals with advantages are better able to reproduce and pass along their traits

Question 12

Adaptive Radiation

Answer 12

Describes the type of natural selection where many different species appear from one original species

Question 13

Ecological succession

Answer 13

Refers to the changes in biotic characteristics in an area over time

Question 14

Two types of ecological succession

Answer 14

Primary succession

Secondary succession

Question 15

Primary succession

Answer 15

Begins with bare rock
Wind carries spores of lichens and organisms that can survive and eventually with weathering of the rock form soil
Soil improves and plants are able to grow and animals appear

Question 16

Pioneer species

Answer 16

The first organisms to survive and reproduce

They alter that abiotic and biotic environment in someway

Question 17

Secoundary succession

Answer 17

Occurs after major disturbance in an area that already has soil and once had living organisms.
The soil remains for plants growth and contains seeds, micro organisms worms, insects

Question 18

Climax community

Answer 18

The process of primary succession leads to the development of a mature community which is sometimes called climax community

Question 19

Natural event that affect the ecosystem

Answer 19

Flooding, tsunamis, insect infestation’s, forest fires

Question 20

Human influences on ecosystem

Answer 20

deforestation, agriculture, resource exploitation, urbanization

Question 21

Soil degradation

Answer 21

Can occur with water and wind and erosion removes topsoil from bore land

Question 22

Soil compact

Answer 22

Occurs when soil particles are squeezed together and air space is removed

Question 23

Habitat fragmentation

Answer 23

breaks a habitat a part

Question 24

Substanability

Answer 24

Using the resources of an ecosystem to meet our needs today without reducing the function and health of that ecosystem or the ability of the future generations to meet their needs

Question 25

Native species

Answer 25

Plants and animals naturally inhabit an area

Question 26

Introduced or foreign species

Answer 26

Plants, animals, or micro organisms that are transported into a region where they did not previously exist. This can be accidental or on purpose

Question 27

Invasive species

Answer 27

Organisms that take over the habitat of native species or invade their bodies

Question 28

Examples of invas in BC

Answer 28

Purple loosestrife, Eurasian Milfoil, scotch broom, European starling

Question 29

Competition

Answer 29

The introduced, invasive species compete with native species for resources such as food, sunlight, water

Question 30

Predation

Answer 30

Introduced predatory have a greater impact on prey because prey have not adapted

Question 31

Disease and parasites

Answer 31

Viruses, bacteria, and parasites can weaken the immune system of native species/animals.
Examples, Sea lampreys, white bark Pine

Question 32

Negative parts about invasive species attacking native species

Answer 32

Competition, predatation, disease and parasites, habitat alteration

Question 33

Habitat alteration

Answer 33

And introduced be invasive species changes the structure or composition of the habitat making it unsuitable for native species

Question 34

Invasive in pville

Answer 34

American bullfrog, Scotchbroom, hogweed, starlings

Question 35

Traditional ecological knowledge

Answer 35

Ecological information passed down from generation to generation, which reflects human experience with nature

Question 36

Bioaccumulation

Answer 36

The gradual buildup of chemicals in living. Organisms