In areas close to shore where there is more flow from rivers and streams, or in polar regions where there is melting ice, the water may be less saline. One common system divides rivers into 3 principal zones: potamon, rhithron, and crenon. This analysis of 232 sites at rivers and streams in the United States is the most extensive study of its type, but there are still many gaps in the data and unanswered questions. A stream may create a pool where water slows and becomes deeper.The point at which a stream comes into a large body of water, like an ocean or a lake is called the mouth. Rivers are deeper than streams.River carries the sediments brought into it by streams into larger water bodies such as ocean or a lake.Unlike streams, rivers flow within wider banks. Streams begin at a point of origin referred to as source water. The smaller of the two streams is a tributary of the larger stream. : a. salt marsh b. brackish marsh c. river d. pond. The potamon zone describes the downstream area of a river. Biotic classification refers to the type of ecosystem found in a particular river. The source water is usually cold, low in nutrients, and clear. The largest rivers include the Nile River in Africa, the Amazon River in South America, and the Mississippi River in North America. At the source, these waterways have cooler temperatures and clearer water. The salinity level in seawater is fairly constant, at about 35 ppt (35,000 mg/L), while brackish estuaries may have salinity levels between 1 and 10 ppt. They vary in length, size, flow charac- teristics, catchment type and water quality. As the water travels towards the mouths of tributaries, … d. marshes and swamps. Of this salt content, carbon as bicarbonate constitutes 58 parts, or 48 percent, and calcium, sulfur as sulfate, and silicon as dissolved monomeric silicic acid make up a total of about 39 parts, or 33 percent. runoff. Which ecosystem has the highest level of salinity? This classification includes the purest, cleanest rivers as well as the most contaminated. In contrast to ocean water, the average salinity of the world’s rivers is low—only about 0.012 percent, or 120 ppm by weight. The higher the runoff of water per unit of watershed area is, the more salt is carried into the river that drains the watershed. Where the stream meets the ocean or lake is an estuary. Rivers and streams are part of the freshwater biome, and they experience different climates along their lengths. Abiotic features of rivers and streams vary along the length of the river or stream. There are also considerable differences in the degree to which they have suffered degradation through eroding beds and banks, pollution and catchment erosion. According to the Stream Order Classification of Waterways, something that is between sixth order and twelfth order is considered a river. 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