Chapter 13 and still waters

When food is formed under water. Starting with algae and photosynthesis moving up to bigger fish that we eat.
Edge Effect
When land is cleared for timber and such and Animals that once lived there will move into the remainig forest.
Optimum Sustainable Population
A population that will provide the most benefit whether it be economically or ecologically. Results in optimum sustainable yeild.
Subsistnence Farming
When the items being farmed are used directly by those who farm it or go short distances to near by markets. In fish situation, Fish are not getting caught in large amounts and shipped out across the nation.
Commercial Farming
The opposite of Subsistnence farming. It is all other uses not related to tradition or culture (not directly eaten or used close to home).