: a. salt marsh b. brackish marsh c. river d. pond. runoff. At the source, these waterways have cooler temperatures and clearer water. Salinity is an important measurement in seawater or in estuaries where freshwater from rivers and streams mixes with salty ocean water. Which ecosystem has the highest level of salinity? They vary in length, size, flow charac- teristics, catchment type and water quality. The potamon zone describes the downstream area of a river. The smaller of the two streams is a tributary of the larger stream. 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. One common system divides rivers into 3 principal zones: potamon, rhithron, and crenon. Biotic classification refers to the type of ecosystem found in a particular river. 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. 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. Abiotic features of rivers and streams vary along the length of the river or stream. Where the stream meets the ocean or lake is an estuary. RIVERS AND STREAMS Types of rivers and streams A wide range of rivers and streams exist in Victoria. Rivers and streams are part of the freshwater biome, and they experience different climates along their lengths. According to the Stream Order Classification of Waterways, something that is between sixth order and twelfth order is considered a river. 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. The higher the runoff of water per unit of watershed area is, the more salt is carried into the river that drains the watershed. As the water travels towards the mouths of tributaries, … 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. Streams begin at a point of origin referred to as source water. Increased salinity and flow in streams and wetlands is likely to make an issue of the salt tolerance of vegetation. This classification includes the purest, cleanest rivers as well as the most contaminated. 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. There are also considerable differences in the degree to which they have suffered degradation through eroding beds and banks, pollution and catchment erosion. d. marshes and swamps. To quantify the relation, the author analyzed U.S. Geological Survey records for a 10-year period showing the salt content and river-flow volume at selected sampling points for 15 rivers … The largest rivers include the Nile River in Africa, the Amazon River in South America, and the Mississippi River in North America. 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. The source water is usually cold, low in nutrients, and clear. 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. salt marsh. 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