Chapter 58-Dynamics of Ecosystems Flashcards Preview

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Flashcards in Chapter 58-Dynamics of Ecosystems Deck (16):
1

Ecosystem

-includes all the organisms that live in one place (biotic) plus the abiotic environment in which they live

2

Biogeochemical cycle

-chemicals moving through ecosystems
-biotic and abiotic processes
-cross boundaries of ecosystems

3

carbon fixation

-metabolic reactions that make nongaseous compounds from gaseous ones

4

Methanogenss

-produce methane by anaerobic cellular respiration

5

Nitrogen cycle

-nitrogen is a component of all proteins and nucleic acids
-inorganic
-most plants and animals cannot use N2 the gas

6

Nitrogen fixation

synthesis of nitrogen containing compounds from N2

7

Nitrification

N2-NH3-NO3-

8

Denitrification

-NO3- -- N2

9

Phosphorous cycle

-required by all organisms
-plants and algae use free inorganic phosphorous, animals eat plants to obtain their phosphorous

10

Limiting nutrient

-weak link in an ecosystem, shortest supply
-can be nitrogen and phosphorous

11

Energy exists as..

-light
-chemical (bond energy)
-motion
-heat

12

Productivity

rate at which the organisms in the trophic level collectively synthesize new organic matter

13

Gross primary productivity

raw rate at which primary producers sythesize new organic matter and store energy

14

Net primary productivity

the GPP less the respiration of the primary producers

15

Breakdown of energy usage in organisms (percentage)

50% of chemical bond energy is not assimilated and is egested in feces
-33% used for cellular respiration
-17% converted into biomass

16

Amount of chemical bond energy available to a trophic level over time

10% of that available to the preceding level of the same period of time