photic zone


photic zone
the upper layer of a body of water delineated by the depth to which enough sunlight can penetrate to permit photosynthesis.
[1970-75]

* * *

      surface layer of the ocean that receives sunlight. The uppermost 80 m (260 feet) or more of the ocean, which is sufficiently illuminated to permit photosynthesis by phytoplankton and plants, is called the euphotic zone. Sunlight insufficient for photosynthesis illuminates the disphotic zone, which extends from the base of the euphotic zone to about 200 m. The thicknesses of the photic and euphotic zones vary with the intensity of sunlight as a function of season and latitude and with the degree of water turbidity. The bottommost, or aphotic, zone is the region of perpetual darkness that lies beneath the photic zone and includes most of the ocean waters.

* * *


Universalium. 2010.

Look at other dictionaries:

  • photic zone — n. the uppermost layer in a body of water into which daylight penetrates in sufficient amounts to influence living organisms, esp. by permitting photosynthesis …   English World dictionary

  • 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 — fotinė zona statusas T sritis ekologija ir aplinkotyra apibrėžtis Ežero, tvenkinio, jūros ar vandenyno priekrantės sritis (ežeruose, tvenkiniuose iki 2 m gylio, jūrose iki 200 m gylio), kur prasiskverbia saulės šviesa ir gali vykti fotosintezė.… …   Ekologijos terminų aiškinamasis žodynas

  • photic zone — noun see photic region * * * Biol. the upper layer of a body of water delineated by the depth to which enough sunlight can penetrate to permit photosynthesis. [1970 75] …   Useful english dictionary

  • photic zone — Surface waters penetrated by light; see aphotic zone …   Dictionary of invertebrate zoology

  • photic zone — /ˈfoʊtɪk zoʊn/ (say fohtik zohn) noun → euphotic zone …   Australian English dictionary

  • photic zone — surface waters where there is enough light for photosynthesis …   Dictionary of ichthyology

  • photic zone — noun that part of the near surface body of an ocean or lake that receives enough sunlight for photosynthesis to be possible …   Wiktionary

  • photic zone — layer of the ocean that is penetrated by sunlight …   English contemporary dictionary

  • photic layer — fotinė zona statusas T sritis ekologija ir aplinkotyra apibrėžtis Ežero, tvenkinio, jūros ar vandenyno priekrantės sritis (ežeruose, tvenkiniuose iki 2 m gylio, jūrose iki 200 m gylio), kur prasiskverbia saulės šviesa ir gali vykti fotosintezė.… …   Ekologijos terminų aiškinamasis žodynas


We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.