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. 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. Abiotic features of rivers and streams vary along the length of the river or stream. 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. The source water is usually cold, low in nutrients, and clear. As the water travels towards the mouths of tributaries, … The higher the runoff of water per unit of watershed area is, the more salt is carried into the river that drains the watershed. : a. salt marsh b. brackish marsh c. river d. pond. The potamon zone describes the downstream area of a river. Salinity is an important measurement in seawater or in estuaries where freshwater from rivers and streams mixes with salty ocean water. a. salt marsh. According to the Stream Order Classification of Waterways, something that is between sixth order and twelfth order is considered a river. runoff. Which ecosystem has the highest level of salinity? Streams begin at a point of origin referred to as source water. The largest rivers include the Nile River in Africa, the Amazon River in South America, and the Mississippi River in North America. RIVERS AND STREAMS Types of rivers and streams A wide range of rivers and streams exist in Victoria. 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. This classification includes the purest, cleanest rivers as well as the most contaminated. 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. Increased salinity and flow in streams and wetlands is likely to make an issue of the salt tolerance of vegetation. The type of plankton that produces most of the food in an aquatic ecosystem is called: ... b. rivers and streams c. littoral zones and benthic zones d. marshes and swamps. One common system divides rivers into 3 principal zones: potamon, rhithron, and crenon. At the source, these waterways have cooler temperatures and clearer water. The smaller of the two streams is a tributary of the larger stream. Rivers and streams are part of the freshwater biome, and they experience different climates along their lengths. There are also considerable differences in the degree to which they have suffered degradation through eroding beds and banks, pollution and catchment erosion. Where the stream meets the ocean or lake is an estuary. 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