Efficiency and Adaptation

Cooperation and trade are common in the natural world. Based on the cost of production and the constraints presented by the environment, an organism may be more successful by trading for a product than producing it. In this situation the organism may specialize in one product and trade for another. In this SLP we will examine an example of trading partners, mycorrhizal fungi and plants, and compare it to the principles of international trade, an important component of macroeconomics. After you view this tutorial, consider some of the principles it introduced and how they apply to specialization and trade between the symbiotic partners that make up a mycorrhizal association.

In the videos and tutorials you completed for your Case 3 Assignment, you learned about how plants can utilize sunlight to build sugars. Some of these sugars are sent to plant roots for growth and storage. Mycorrhizal fungi live within or surrounding plant roots as a symbiosis. Mycorrhizal fungi cannot make their own food. As fungi, they have the ability to decompose organic (carbon-based) material, but they do not contain chlorophyll and must obtain carbon directly from the environment (like we do!). The fossil record shows mycorrhizal fungi living in association with the earliest plants, bryophytes.

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