Through these experiments, you concluded that:

1. Dissolved oxygen increases with decreasing temperature, decreasing salinity, and increasing water velocity. Cooler waters have higher levels of dissolved oxygen than areas of the watershed at higher temperatures. Waters with higher salinity (salt concentration) contain less dissolved oxygen than freshwater at the same temperature. The faster the water is moving, the greater the amount of dissolved oxygen in the water will be. Slower-moving waters will have less dissolved oxygen than faster-moving waters at the same temperature and salinity. The amount of dissolved oxygen in a watershed can affect the types of organisms, such as plants and fish, that live in the waters of a watershed.