Appendix - Glossary

Alluvial valley – a valley that contains a river flowing in channels composed of materials eroded and deposited by the river itself. The channel is mobile and is able to change its size, shape, bed elevation, and course in response to a change of flow regime. Aquatic ecosystem Any water-based ecosystem, such as a stream, pond, lake or ocean. Aquifer Porous, water-saturated layers of sane, gravel, or bedrock that can yield an economically significant amount of water. Community Populations of all species living and interacting in an area at a particular time. Competition Two or more individual organisms of a single species (intraspecific competition), or two or more individuals of different species (interspecific competition), attempting to use the same scarce resources in the same ecosystem. Connectivity A standard by which is measured the ability of a system or species to interact, move, migrate, or otherwise attain connection in order to reproduce, seek food, shelter, or an environment to achieve persistence or sustainability. Dissolved oxygen (DO) Amount of oxygen gas dissolved in a given volume of water at a particular temperature and pressure, often expressed as a concentration in parts of oxygen per million parts of water. Distinct population segment (DPS) -Distinct vertebrate population segments of a species, discreet in having separable or isolated physiological, ecological, or behavioral characteristics. Ecosystem – Community of different species interacting with one another and with the chemical and physical factors making up its nonliving environment. Endangered Species Act (ESA)– This 1973 legislation and its subsequent amendments to provide protection for species and their habitats. The ESA defines three crucial categories: "endangered," "threatened" species, and "critical habitat." Subspecies of plants and animals and distinct population segments can also qualify for protection. Fluvial – Of or related to living in a stream or a river. Hybrid Offspring produced by crossing two individuals of unlike genetic constitution. Hydrologic cycle Biogeochemical cycle that collects, purifies, and distributes the earth's fixed supply of water from the environment, to living organisms, and back to the environment. Lacustrine – Of, related to, or growing in a lake. Lahontan cutthroat trout Oncorhynchus clarki henshawi an inland subspecies of cutthroat trout endemic to the physiographic Lahontan basin of northern Nevada, eastern California, and southern Oregon. Metapopulation Fish population defined by its expansive presence in accessible habitat whereby its needs for sustainability are met through diversity of habitats, corridors for movement, and interconnection. NEPA, National Environmental Policy Act – Legislation passed in 1969, that identified a national policy to "use all practicable means" to minimize environmental impact of federal actions. The Act specifically requires decisions regarding all federally controlled or subsidized projects, such as highways, dams, airports, etc., to outline possible adverse impacts in an environmental