euphotic

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Related to Photic zone: Aphotic zone, Profundal zone

euphotic

(yo͞o-fŏt′ĭk)
adj.
Of, relating to, or being the uppermost layer of a body of water that receives sufficient light for photosynthesis and the growth of green plants.
References in periodicals archive ?
We found that upper photic zone coccolithophore communities in southern Tyrrhenian Sea water and Levante Bay were very similar in areas unaffected by elevated C[O.sub.2].
This culture cavity with circular photic zone for autoobservation and heating coil for adjusting temperature realizes in-place culturing, observing and recording, with the aid of automatic control system having microfluidic and temperature control circuits.
The Early Toarcian Oceanic Anoxic Event (T-OAE) was a global event of environmental and carbon cycle perturbations which were deeply affected by sea-level fluctuation, palaeoproductivity and the difference in [[delta].sup.13]C of C[O.sub.2] in the photic zone.
Usually, this coloration is produced by boring green algae and, not surprisingly, the sites with highest Factor-7 scores were nearly all sites in the photic zone characterized by hardground sediment types, where burial was limited (Fig.
Secchi disk measurements taken outside the mesocosms indicated that the exposures were always within the photic zone (as estimated by 1.7X Secchi disk reading).
Using this criteria, the size of the productive habitat was observed to vary 10-fold (including the ENSO event of 1997/98), presumably in relation to the degree of upwelling and, subsequently, nutrient concentrations in the photic zone. The use of remote sensing has undoubtedly shed a great deal of light on the variability in primary production for EBCSs, however the application of such a mobile boundary complicates the efforts of the modeler, especially if one is to attempt dynamic modeling over longer periods of time.
These species of fish tend to stay below the photic zone usually at depths greater than 300 m during the day and migrate up near the surface at night.
The limestones of the Central Baltoscandian confacies belt are shallow-water deposits formed within the photic zone. In contrast, Lindstrom (1988) argued for deeper depositional conditions in the order of several hundred metres.
One scheme to sequester C[O.sub.2] tests fertilizing the photic zone, causing an algal bloom.
In turn, the age, size, facies and the substrate of such platforms provide valuable information on the tectonic and/or magmatic events that rose oceanic basement or volcanic edifices into the photic zone.
The density of phytoplankton populations (microplankton and nanoplankton) in the photic zone is usually between 10 and 1,000 cells per milliliter.