euphotic


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Related to euphotic: photic, Photic 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 ?
The formation and subsequent detachment of these structures from the islands stimulate the vertical ascent of nutrients up to the euphotic zone, promoting phytoplankton bloom and/or the passive advection of subsurface phytoplankton maximums towards the surface (Hasegawa et al., 2009).
Channel Mean Min-Max Temperature ([degrees]C) 26.5 20.4-22.5 Dissolved oxygen (mg [L.sup.-1]) 4.8 0-11.5 Salinity (psu) 7 0-16.8 Maximum euphotic zone (m) depth 1.2-depth Depth (m) 1 0.8-1.5 Lagoon Mean Min-Max Temperature ([degrees]C) 27.8 21.4-31.5 Dissolved oxygen (mg [L.sup.-1]) 8.4 4.9-13.9 Salinity (psu) 12.5 7.2-17.2 Maximum euphotic zone (m) 1.8 1.5-2.7 Depth (m) 3.9 3-4 Table 2.
As result of this interaction, a horizontal/vertical deformation (narrowing/expansion) of the eddy favoring the isolines eddy elevations within the euphotic zone (Fig.
Values of precipitation--Pre (mm); wind speed--Win (m.[s.sup.-1]), depth--Dep (m), euphotic zone--[Z.sub.cu] (m), euphotic zone:maximum zone ratio--[Z.sub.cu]:[Z.sub.max], air temperature--[T.sub.a] ([degrees]C), water temperature--[T.sub.w] ([degrees]C), dissolved oxygen--DO (mg.[l.sup.-1], turbidity--Turb (NTU), soluble reactive phosphorus--P-SRP ([micro]g.[l.sup.-1]), dissolved total phosphorus--P-DTP ([micro]g.[l.sup.-1]) and dissolved inorganic nitrogen--N-DIN ([micro]g.[l.sup.-1]) recorded in the four sampling stations in the two arms of Salto Caxias reservoir, from September 2010 to July 2011.
The rainfall data indicated the existence of clearly distinct periods in terms of rainfall, i.e., a rainy period extending from November 2006 (spring) to March 2007, which was also characterized by higher temperatures and decrease of the extent of the euphotic zone.
Here, it was used the Lalli & Parsons' criterion (2006) who define z as the limit of the euphotic zone.
Near-surface stratification is an important parameter for the supply of nutrients to the euphotic zone by turbulent mixing processes, with increased stratification during austral summer acting to suppress mixing.
As a result, nutrient supply in the euphotic zone is reduced which leads to dwindling phytoplankton productivity and an increase in water transparency in deep lakes such as lakes Tanganyika and Kivu (Plisnier, 2000; O'Reilly et al., 2003; Verburg et al., 2003; Lorke, Tietze, Halbwachs, & Wuest, 2004) whereas in the shallow Lake Victoria, an increase in productivity has been observed since the lake does not stratify (Hecky et al., 1994).