Semiconservative replication was not the only model of DNA replication proposed during the mid-1950s, however. In fact, two other prominent hypotheses were put also forth: conservative replication and dispersive replication.
Main idea. Aquatic ecosystems are grouped based on abiotic factors such as water flow, depth,distance from shore, salinity, and latitude. Freshwater ecosystems. The major freshwater ecosystems include ponds, lakes, streams,rivers, and wetlands.
Vocabulary. 1  Abiotic: The nonliving components of an ecosystem. 2  Aquatic: Related to water. 3  Biomes: Regions on Earth with similar climate and organisms. Examples: freshwater aquatic, saltwater aquatic, desert, forest, tundra, and grasslands. 4  Biotic: The living components of an ecosystem. Bog: A type of wetland that contains acidic peat, a deposit of dead plants, usually mosses; also called a mire. Ecosystem: An ecological community, including plants, animals, and microorganisms, as well as the abiotic factors in the environment. Fen: A type of wetland fed by surface water, or groundwater, or both. Fens are characterized by their water chemistry, which is neutral or basic.