American Heritage® Dictionary of the English Language, Fourth Edition
- n. The layer of water in a thermally stratified lake that lies below the thermocline, is noncirculating, and remains perpetually cold.
- From Ancient Greek ὑπο- (hypo-), combining form of ὑπό (hypó, "under") + λιμνίον (limnion), diminutive of λίμνη (limnē, "lake"). (Wiktionary)
- hypo- + Greek limnē, lake, pool. (American Heritage® Dictionary of the English Language, Fourth Edition)
“At the same time the bottom 20 calculated for each sampling station on each sampling date. m water temperatures increased by about 0. 3°C throughout In the remainder of this study, the term hypolimnion refers the strati ﬁ ed season, indicating a small, steady downward to the 20-m layer above the bottom (Fig. 3). transfer of heat (Fig. 4).”
“Lake populations needing to avoid temperature extremes are very likely to be confined to the hypolimnion during the warmest months provided anoxic conditions do not develop.”
“In addition, the prolonged thermal stratification that is likely to accompany rising temperatures could possibly lead to lower oxygen concentrations and increased phosphorus concentrations in the hypolimnion, benefiting nutrient-limited primary production.”
“This is likely to lower oxygen concentrations in the hypolimnion and increase stress on cold-water organisms .”
“This mesotrophic area of the lake has a narrow hypolimnion that is often deficient of oxygen.”
“The lake's water is permanently stratified, having a warm epilimnion overlying a cooler hypolimnion and is remarkably clear.”
“The oxygen content of the hypolimnion is higher than that of the epilimnion because the saturated colder water from spring turnover experiences limited oxygen consumption.”
“In eutrophic lakes that are stratified, concentrations of N2 may decline in the epilimnion because of reduced solubility as temperatures rise and increase in the hypolimnion from denitrification of nitrate (NO3) to nitrite (NO2) to inorganic nitrogen (N2).”
“Nitrite (NO2) rarely accumulates except in the metalimnion and hypolimnion of eutrophic lakes.”
“In oligotrophic lakes, high oxygen concentrations permit metabolism of ammonia to nitrate, resulting in low levels of nitrite and ammonia and high levels of nitrate in the hypolimnion.”
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