MiniLab Construct a Food Web How is energy passed from organism to organism in an ecosystem? A food chain shows a single path for energy flow in an ecosystem. The overlapping relationships between food chains are shown in a food web. . Procedure 1. Read and complete the lab safety form. 2. Use the following information to construct a food web in a meadow ecosystem: • Red foxes feed on raccoons, crayfishes, grasshoppers, red clover, meadow voles and gray squirrels. Red cover is eaten by grasshoppers, muskrats, red fores, and meadow voles. Meadow voles, gray squirrels, and raccoons all est parts of the white oak tree. Crayfishes feed on green algae and detritus, and they are eaten by muskrats and red fores. Raccoons feed on muskats, meadow voles, gray squirrels, and white oak trees. . Data and Observations dhe Analysis 1. Identify all of the herbivores, carnivores, omnivores, and detritivores in the food web.

In a trophic chain, energy passes from one trophic level to the other. Foxes are omnivores. Grasshoppers, meadow voles and gray squirrels are herbivores. Muskrats, red fores and racoons are herbivores/carnivores. Crayfishes are herbivore/detritivores. Red clover, oak tree, and algae are Producers.

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When talking about the trophic web, we refer to the energy transference from one organism to the other. These organisms place at different levels. Each level feeds on the anterior one and gets eaten by the next one.

1) The first link is composed of organisms that take radiation energy to produce organic compounds. These are autotroph organisms or producers.

2) The following links are the consumers:

herbivores are primary consumers and feed on producers.
Carnivores are secondary consumers that feed on herbivores.
Tertiary consumers feed on secondary consumers, and so on.

3) The last links are the decomposers, fungi, and microorganisms that act on dead animals degrading organic matter.

Any change that occurs at any of the links will immediately affect the other links too. It will cause an increase or decrease in their population sizes.

From the energy that reaches the earth's surface, only 0.1 or 1% is absorbed by autotroph organisms or producers. This small percentage of energy flows through all organisms in the ecosystem -from autotrophs to heterotrophs- until it dissipates in the environment.

Only 10% of energy passes from one level to the next one. This assessment is called The 10% rule. It states that only about 10% of the energy stored as biomass at one trophic level, ends up as biomass at the next trophic level.

The progressive reduction of energy determines the number of trophic levels (4 or 5).

Red foxes ⇒ omnivores ⇒ feeds on raccoons, crayfishes, grasshoppers, red clover, meadow voles and gray squirrels.
Grasshoppers ⇒ Herbivore⇒ feeds on red clover.
Muskrats ⇒ Herbivore/Carnivore ⇒ feeds on red clover, crayfishes
Red fores ⇒ Herbivore/Carnivore ⇒ feeds on red clover, Crayfishes.
Meadow voles ⇒ Herbivore ⇒ feeds on red clover, white oak tree.
Gray squirrels ⇒ Herbivore ⇒ feeds on white oak tree
Raccoons ⇒ Herbivore/Carnivore ⇒ feeds on white oak tree, muskrats, meadow voles, gray squirrels.
Crayfishes ⇒ Herbivore/Detritivore ⇒ feeds on green algae and detritus.
Red clover, Oak tree, and Algae ⇒ Producers

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