Geochemical and biochemical evidence of lake overturn and fish kill at Lake Averno,Italy |
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| Authors: | S Caliro G Chiodini G Izzo C Minopoli A Signorini R Avino D Granieri |
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| Institution: | 1. Istituto Nazionale di Geofisica e Vulcanologia sezione di Napoli “Osservatorio Vesuviano” Via Diocleziano 328-80124 Napoli, Italy;2. ENEA C.R. Casaccia Via Anguillarese 301 Roma, Italy |
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| Abstract: | Lake Averno is situated in the homonymous crater in the northwestern sector of the Campi Flegrei active volcanic system in Campania region, Italy. In February 2005 a fish kill event was observed in the lake, prompting a geochemical survey to ascertain the possible cause. In February 2005 a geochemical survey revealed that the lake water was unstratified chemically and isotopically, presumably, as a result of lake overturn. This fish kill phenomenon was recorded at least two other times in the past. In contrast to the February 2005 results, data collected in October 2005, shows the Lake Averno to be stratified, with an oxic epilimnion (surface to 6 m) and an anoxic hypolimnion (6 m to lake bottom at about 33 m). |
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| Keywords: | lake Averno dissolved gases stable isotopes fish kill event Sulfate Reduction Bacterial |
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