Limnology Limnology Limnology ( ; from Greek λίμνη, "limne", "lake" and λόγος, "logos", "knowledge"), is the study of inland aquatic ecosystems. The study of limnology includes aspects of the biological, chemical, physical, and geological characteristics and functions of inland waters (running and standing waters, fresh and saline, natural or man-made). This includes the study of lakes, reservoirs, ponds, rivers, springs, streams, wetlands, and groundwater. A more recent sub-discipline of limnology, termed landscape limnology, studies, manages, and seeks to conserve these ecosystems using a landscape perspective, by explicitly examining connections between an aquatic ecosystem and its watershed. Recently, the need to understand
Subject of labor Subject of labor Subject of labor, or object of labor, is a concept in Marxist political economy that refers to "everything to which man's labor is applied." (Institute of Economics of the Academy of Sciences of the U.S.S.R., 1957) The subject of labor may be materials provided directly by nature like timber or coal, or materials that have been modified by labor. In the latter case, the subject of labor (e.g., yarn in a textile mill or semi-conductor chips in a computer assembly factory) are called "raw materials." The "subject of labor" is one of three basic factors of the