Chapter 54:Ecosystem Ecology
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What is an ecosystem?
all living organisms in an area + the physical envrionment
an autotroph, synthesize its own food form inorganic soruces
Net Primary Productivity(NPP):
- energy that is invested in new tissue or offspring. represents the amount of energy that is available to other living components of an ecosystem:consumers and decomposers
- -carbon fixed in photosynthesis
organic material that non-photosynthetic organisms can eat
- 1.consumers eat living organisms
- 2.primary consumers eat primary producers
- 3.secondary consumers eat primary consumers
- 4.tertiary consumers eat secondary consumers
gross primary productivity
the total amount of photosynthesis in a given area and time period
Ectotherms or Endotherms;biomass is more effective in
biomass is more effective in ectotherms, devote much less energy to maintenance than endotherms do
increase in concentration at higher levels in a food chain
NPP is higher on___than____
NPP is higher on land than water
The terrestrial ecosystems with the highest productivity are located in the______
The terrestrial ecosystems with the highest productivity are located in the wet tropics
what limits productivity?
- 3.Carbon dioxide
What does iron do when released in the ocean?
Iron increases the amount of chlorophyll a in the ocean which increases NPP
the path that an element takes as it moves from abiotic systems through producers, consumers, and decomposers and back again
completely decyaed organic material
what limits the rate at which nutrients move through an ecosystem?
-the decomposition of detritus. Until decomposition occurs, nutrients stay tied up in intact tissue
The decomposition rate is influenced by:
- 1.abiotic condition; oxygen availability, temperature
- 2. the quality of the detritus
decompositon is inhibited if detritus is
- 1.low in nitrogen
- 2. high in lignin
areas drained by a single stream
Pro/cons of nitrogen in ocean
- 1.increases productivity
- 2.decreases biodiversity and forms dead-zones in aquatic environments
- Natural source: Biological fixation/lightning
- Human source: Nitrogen fertilizer, fossil fuels
the timing of seasonal events
NPP is _____on land and _______in the oceans
NPP is increasing on land but decreasing in the oceans
most of the net primary productivity that is consumed is used for what purpose?
respiration by primary consumers
What is biomagnification?
-accumualation of certain molecules at high concentration at upper trophic levels
what is normally the lonegst-lived reservoir for carbon?
The greatest limiting factor
How ro measure global warming?
measure average ocean temperature
What would you like to do?
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