Topic 12 lecture part 2

Question 1

oligatrophic lake

Answer 1

normal nutrient level lake

Question 2

Eutrophicate lake

Answer 2

too much nutrient lake

Question 3

What happens when you add too much phosphorous to a lake? (4)

Answer 3

• increase phytoplankton (algae)

increase zooplankton

depletes oxygen

increase in fish death

Question 4

Bottom up regulation (2)

Answer 4

capacity for higher trophic level dictated by lower as it determines how much energy can be present Energy at lower level determine the energy at upper levels

Question 5

trophic cascade+ ex (2)

Answer 5

adding removing a top predator results in an alternating effect down the rest of he food web/chain

removing bass causes increase in minnows which decrease zooplankton but increase phytoplankton

Question 6

Top down regulation

Answer 6

Influence of predators and prey on lower trophic levels

Question 7

Keystone species (3)

Answer 7

critically important species for trophic structure

usually small number

dramatic change when removed for ecosystem

Question 8

nutrients

Answer 8

energy required by organisms

Question 9

for nutrients, earth is a

Answer 9

closed system

Question 10

biogeochemical cycles

Answer 10

pathways that describe how nutrients move between biotic and abiotic components of an ecosystem

Question 11

nutrients are in reservoirs explain

Answer 11

Reservoirs can be short term or long term or abiotic and biotic

Question 12

short term in nature reservoirs

Answer 12

<200 years

Question 13

Long tem reservoirs

Answer 13

> 200

Question 14

Biotic

Answer 14

organic molecules

Question 15

abiotic

Answer 15

inorganic molecules

Question 16

There are three major types of geological nutrient reservoirs

Answer 16

terrestrial (land), Aquatic (water), atomspherical (air)

Question 17

Nutrients exist in three potential phases

Answer 17

gases (co2, h2o)

Soluble (C, N, O)

insoluble (P,K, Fe)

Question 18

unavailable organic to available inorganic (2)

Answer 18

erosion
burning of fossil fuels

Question 19

Unavailable inorganic to available inorganic (2)

Answer 19

erosion

weathering

Question 20

Available inorganic to available organic (2)

Answer 20

assimilation, photosynthesis

Question 21

carbon is most abundant as in stats…

Answer 21

50% of dry mass is carbon

Question 22

co2 would____ in winter bc

Answer 22

increase

organisms not photosynthetically active and industrial activity release co2

Question 23

co2 ___ in summer

Answer 23

decrease

Question 24

so explain why co2 doesn’t stay the same since one half world summer and one half winter

Answer 24

more terrestrial environment above equator large continential ass in north and a lot of these activity happen in north