freshwater bed

См. также в других словарях:

• Freshwater environmental quality parameters — are the natural and man made chemical, biological and microbiological characteristics of rivers, lakes and ground waters, the ways they are measured and the ways that they change. The values or concentrations attributed to such parameters can be… …   Wikipedia

• Freshwater pearl mussel — The exterior of the shell of Margaritifera margaritifera Conservation status …   Wikipedia

• Stream bed — The bed of this stream is armored with rocks, some very rounded (having had a longer life in the stream) and some not. A stream bed is the channel bottom of a stream, river or creek; the physical confine of the normal water flow. The lateral… …   Wikipedia

• Deep sand bed — A deep sand bed is[1] a filtration method used in some saltwater aquariums. A deep sand bed, similar to the Berlin Method, is designed to cultivate anaerobic bacteria in the bottom layers of sand, converting nitrate to nitrogen gas to remove… …   Wikipedia

• Upland and lowland (freshwater ecology) — In studies of the ecology of freshwater rivers, habitats are classified as upland and lowland. Upland habitats are cold, clear, rocky, fast flowing rivers in mountainous areas; lowland habitats are warm, slow flowing rivers found in relatively… …   Wikipedia

• Mekong freshwater stingray — Conservation status Endangered (IUCN 3.1)[1] …   Wikipedia

• Ursus deningeri — Temporal range: Miocene–Pleistocene …   Wikipedia

• betta — ˈbed.ə noun Etymology: New Latin 1. capitalized : a genus of small brilliantly colored long finned freshwater anabantid fishes of southeastern Asia related to the climbing perch 2. s sometimes capitalized : any fish of the genus Betta; especially …   Useful english dictionary

• Constructed wetland — Vertical Flow type of Constructed Wetlands A constructed wetland or wetpark is an artificial wetland, marsh or swamp created as a new or restored habitat for native and migratory wildlife, for anthropogenic discharge such as wastewater,… …   Wikipedia

• River delta — Nile River delta, as seen from Earth orbit. The Nile is an example of a wave dominated delta that has the classic Greek delta (Δ) shape after which river deltas were named. A delta is a landform that is formed at the mouth of a river where that… …   Wikipedia

• river — river1 riverless, adj. riverlike, adj. /riv euhr/, n. 1. a natural stream of water of fairly large size flowing in a definite course or channel or series of diverging and converging channels. 2. a similar stream of something other than water: a… …   Universalium