Un lac acide de montagnes anciennes. Le lac de Lispach, dans lesVosges - Etude hydrobiologique

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URI: http://hdl.handle.net/2042/33494
Title: Un lac acide de montagnes anciennes. Le lac de Lispach, dans lesVosges - Etude hydrobiologique
Author: Hubault, Etienne
Abstract: AN ACID LAKE OF ANCIENT MOUNTAINS - The lake of Lispach is situated in the higher Vosges, at 912metres above the sea-level.It is a dystrophic lake, with acid, brown coloured waters. Inspite of its shallowness (io m 3), the bottom water is always ata low and steady temperature varying between 4° 5 and 6° C.This determines a very distinct thermocline during the warmseason.The hydrogen ion concentration varies from 5,3 to 6,5.The surface water is invariably supplied well enough withdissolved oxygen (5,05 to 8,6 cm 3 per litre); but the bottom isalways very poor, if not unprovided with this gas (0,4 to1,5 cm 3per litre).The quantity of electrolytes is very low. Soluble phosphorusand silica are relatively plentiful at bottom : respectively, 8 to80 mmgr. per ton of water, and 6,5 to 10,7 mmgr. per litre, accordingto seasons. At the surface, the contents are lower : from 4 to11 mmgr. per ton for phosphorus and from 4,7 to 8,2 mmgr.per litre for silica. The amount of soluble phosphorus in thebottom water, through the different seasons, is a function ofthe quantity of zooplankton in the surface water.This surface water is rich in zooplankton, but chiefly insummer. It contains various species of Entomostracea whichgive to the lake a rather well marked northerly- alpine character.
Publisher: ENEF, Ecole nationale des eaux et forêts, Nancy (FRA)
Date: 1932

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