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euphotic region

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  • Deep sea communities — giant tubeworm Deep sea communities currently remain largely unexplored, due the technological and logististical challenges and expense involved in visiting these remote biomes. Because of the unique challenges (particularly the high barometric… …   Wikipedia

  • marine ecosystem — Introduction       complex of living organisms in the ocean environment.       Marine waters cover two thirds of the surface of the Earth. In some places the ocean is deeper than Mount Everest is high; for example, the Mariana Trench and the… …   Universalium

  • Nitrogen cycle — Schematic representation of the flow of nitrogen through the environment. The importance of bacteria in the cycle is immediately recognized as being a key element in the cycle, providing different forms of nitrogen compounds assimilable by higher …   Wikipedia

  • Fisheries glossary — This is a glossary of terms used in fisheries, fisheries management and fisheries science. A * Abundance is a measure of how many fish are in a population or a fishing ground. See relative abundance and absolute abundance.* Acoustic survey a… …   Wikipedia

  • Photic zone — The photic zone or euphotic zone (Greek well lit ) is the depth of the water in a lake or ocean, that is exposed to sufficient sunlight for photosynthesis to occur. The depth of the photic zone can be greatly affected by seasonal turbidity.It… …   Wikipedia

  • photic zone — Biol. the upper layer of a body of water delineated by the depth to which enough sunlight can penetrate to permit photosynthesis. [1970 75] * * * ▪ oceanography       surface layer of the ocean that receives sunlight. The uppermost 80 m (260… …   Universalium

  • Carbon sink — A carbon sink is reservoir of carbon that accumulates and stores carbon for an indefinite period. The main natural sinks are: # Absorption of carbon dioxide by the oceans # Photosynthesis by plants and algae The process by which carbon sinks… …   Wikipedia

  • Photosynthetic picoplankton — is the fraction of the plankton performing photosynthesis composed by cells between 0.2 and 2 µm (picoplankton). It is especially important in the central oligotrophic regions of the world oceans that have very low concentration of nutrients.… …   Wikipedia

  • F-ratio — In oceanic biogeochemistry, the f ratio is the fraction of total primary production fuelled by nitrate (as opposed to that fuelled by other nitrogen compounds such as ammonium). This fraction is significant because it is assumed to be directly… …   Wikipedia

  • Ocean fisheries — A fishery is an area with an associated fish or aquatic population which is harvested for its commercial value. Fisheries can be wild or farmed. Most of the world s wild fisheries are in the ocean. This article is an overview of ocean fisheries.… …   Wikipedia

  • Puget Sound environmental issues — articleissues POV = December 2007 copyedit = January 2007 citationstyle = October 2008The environmental health of Puget Sound, Washington has a diverse and complex history related to a long, involved relationship with marine and freshwater… …   Wikipedia

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