La settimana che si apre oggi sarà con ogni probabilità una fra le più calde dell'anno, con temperature che in alcune regioni della Svizzera potranno raggiungere picchi fra i 34 e i 35 gradi centigradi.
Tanto caldo fa presagire severe conseguenze per la fauna di fiumi e laghi. Temperature delle acque superiori ai 20 gradi minacciano infatti la sopravvivenza dei pesci. E il superamento della soglia dei 25 gradi può in questo senso risultare fatale.
Acque troppo calde per i pesci
RSI/Mattia Coste 23.07.2018, 14:24
Vanno in questo senso le preoccupazioni manifestate dalla Federazione svizzera di pesca. Si teme in particolare il ripetersi di quanto avvenne nella torrida estate del 2003, con decine di migliaia di pesci morti nei corsi d'acqua elvetici a seguito delle elevate temperature (quella del Reno, ad esempio, raggiunse i 27 gradi).
RG/ARi
Acque troppo calde per i pesci
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