BIO330H5 Lecture Notes - Primary Producers, Primary Production, Ecosystem Services

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coraleagle739

26 Jun 2012

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Document Summary

Solar energy enters ecosystems by way of plants and other photosynthetic organisms. Only about 5 percent of the solar energy that arrives on earth is captured by photosynthesis; remaining energy is either radiated back into the atmosphere as heat or taken up by the evaporation of water. Gross primary productivity (gdp) is the rate at which energy is incorporated into the bodies of photosynthetic organisms. The accumulated energy is called gross primary production. Primary producer use some of this accumulated energy for their own metabolism; the rest is stored in their bodies or used for their growth and reproduction. The energy available to organisms that eat primary producer, called net primary production (npp), is gross primary production minus the energy expended by the primary producers during their metabolism. Only the energy of an organism"s net production is available to other organisms that consume it.

Related Questions

11. As energy flows through the food web in an ecosystem, the amount of energy that is transferred from one trophic level to the next trophic level increases. stays the same. decreases. may increase or decrease, depending upon the system.

12. Autotrophs are organisms that obtain energy by breaking down tissues of organisms that have died. harness external energy sources to produce complex chemical compounds. depend directly on primary producers for their energy and nutrients. eat other autotrophs to obtain energy.

13. Which of the following gives the correct order for energy flow through an ecosystem? primary producers â secondary producers â tertiary producers primary consumers â primary producers â secondary producers secondary consumers â primary consumers â primary producers primary producers â primary consumers â secondary consumers

14. Which one of the following aspects of plant biology is not directly involved in maintaining an adequate supply of water for the entire plant? phloem roots xylem transpiration pull

15. Which structure(s) do most plants use to acquire the energy that they need for cellular processes? the roots the leaves the stem

please answer the following questions TRUE OR FALSE

1)sometimes succession occurs without any change in the species that compose a community

2) The difference between gross primary productivity and net primary productiviry is determined by the respiration of primary producers

3)The net primary productivity is usually more than 80% of gross primary productivity

4) The amount of net secondary productivity cannot exceed the amount of net primary productivity

5) because energy is lost during assimilation and production on;y less than 25% of the energy at one trophic level advances to the next trophic level

Net primary production closely equals:
a. ecosystem respiration
b. gross primary production
c. net secondary production
d. photosynthesis minus producer respiration

The tolerance model of succession differs from the facilitationand inhibition models in that:
a. early successional species have little effect on laterones
b. species have little effect on each other
c. later successional species outcompete early successionalones
d. early successional species outcompete later successionalones

1. What limits primary productivity?

2. What drives succession?