For the purpose of biological investigations, it is convenient to consider the sea as divided vertically into three zones with respect to the amount of light that is present. These are: (a) the euphotic zone, which is abundantly supplied with light sufficient for the photosynthetic processes of plants (in oceans down to 80 m); (b) the disphotic zone, which is only dimly lighted and extends in the open ocean from about 80 m to 200 or more metres. No effective plant production can take place here; (c) the aphotic zone, the lightless region below the disphotic zone. The depth of the euphotic zone varies with the water's extinction coefficient, the angle of incidence of the sunlight, the length of day and cloudiness.
upper layer of ocean where photosynthesis takes place. photic zone.
In aquatic systems, the layer or depth of water through which there is adequate light penetration to support photosynthesis.
The upper portion of the sea, in which sunlight is intense enough to allow plant growth.
Upper layer of a body of water through which sunlight can penetrate and support photosynthesis.
an ocean zone in which enough light penetrates for photosynthesis to occur. It commonly extends from 60 to 70 meters deep
the zone where enough ligh penetrates so that photosynthesis can occur
That part of a water body where light penetration is sufficient to maintain photosynthesis.
u-FOT-ik ZONE Part of the ocean where photosynthesis occurs. 883
Surface waters to a depth of approximately 80-100 m; the lit region that extends virtually from the water surface to the level at which photosynthesis fails to occur because of reduced light penetration.
The upper part of the marine biome where light penetrates and photosynthesis occurs; usually extends to about 200 meters below the water surface.
In the ocean, the sunlit layer consisting of the upper 100 m or so in which most of the primary productivity takes place. The depth varies geographically and seasonally and can range from a few metres in turbid waters near the shore to 120 m in the Sargasso Sea. It is a zone with sharp gradients in illumination, temperature and salinity, and is the upper of three vertical zones that comprise the pelagic part of the ocean, the other two being the middle mesopelagic and the lower bathypelagic zones. It is also known as the photic zone.
the upper layers of a body of water into which sufficient light penetrates to permit photosynthesis
The upper layer of a water body as defined by light penetration; the upper limit is the water surface, the lower limit is the depth to which sufficient light for photosynthesis can penetrate. The euphotic zone is also called the trophogenic zone and occasionally the photic zone. The dark region below the euphotic zone is called the tropholytic zone. [Gk. eu, well - photo, light.
The ocean's surface layer; that part receiving enough light for photosynthesis
the upper portion of a lake or reservoir where sufficient light is present to support growth of aquatic plants
The surface zone of a lake or ocean within which net primary productivity occurs.
The layer of a water body that receives sufficient sunlight to support effective photosynthesis.
