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Related to hypolimnion: Metalimnion


 (hī′pə-lĭm′nē-ŏn′, -ən)
The layer of water in a thermally stratified lake that lies below the thermocline, is noncirculating, and remains perpetually cold.

[hypo- + Greek limnē, lake, pool.]

hy′po·lim·net′ic (-lĭm-nĕt′ĭk), hy′po·lim′ni·al adj.


n, pl -nions or -nia (-nɪə)
(Physical Geography) the lower and colder layer of water in a lake
[C20: from hypo- + Greek limnion, diminutive of limnē lake]


(ˌhaɪ poʊˈlɪm niˌɒn, -ni ən)

n., pl. -ni•a (-ni ə)
(in certain lakes) the layer of water below the thermocline.
[1905–10; hypo- + Greek -limnion, derivative of límnē lake]
hy`po•lim•net′ic (-lɪmˈnɛt ɪk) hy`po•lim′ni•al, adj.
References in periodicals archive ?
2014), land-use changes have increased incidents of hypoxic conditions within the hypolimnion of lakes (Latta, 1995; Honsey et al.
When a hypolimnion remains anoxic, obligately anaerobic prokaryotic populations, including Archaeal methanogens, presumably increase, but a lake that never has an oxygenated hypolimnion due to salt-induced stratification likely produces more methane because conditions that favor methanogen growth are persistent.
1 includes an analysis of physico-chemical water in the following range: a) oxygen dissolved in, b) the average oxygen saturation hypolimnion, c) pH; d) the conductivity.
Especially later in summer, you might also see the temperature continue to gradually drop beneath the thermocline and into the hypolimnion.
2] was fed into the hypolimnion, or lower layer, via the lake bed while the forced inflow of lime remained directly beneath the surface of the water.
The high surface temperatures and the presence of a thermocline prevent mixing between the hypolimnion and epilimnion, leading to differences in parameters such as phytoplankton, pH and DO (Gu and Stefan, 1995).
2003) that has been widely demonstrated in the hypolimnion of floodplain lakes, as well as its input associated with the upper layers of the water column during the mixing events.
During refilling in 2011, the water in the lake zone was aerated and destratified using twenty aeration towers that pumped an air/water mixture into the hypoxic water layer on the lake bottom and/or repumped oxygenated water from the euphotic zone into the deeper hypolimnion (Palcik et al.
2004) stressed that Anabaena and Aphanizomenon can compensate for their N demand by vertical migrations into the hypolimnion or the sediments, thus avoiding the need to fix nitrogen (low DIN hypothesis).
For this, the following hypotheses were tested: i) The limnological variables characterize the distinct hydrological periods and water column strata; ii) the ciliate species composition is significantly altered between the upper (epilimnium) and lower (hypolimnion) strata of the water column, considering the relative contribution of euplanktonic and benthic species; iii) the values of richness and abundance are greater in the hypolimnion, where the resource availability is high given the greater amount of organic matter from the sediment; iv) the values of richness and abundance are greater in the dry period due to the higher environmental stability in this period.