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La superficie del lago di Zugo è diventata rossa. Il fenomeno è stato osservato in questi giorni in particolare nei pressi di un pontile a Zugo, come ha fatto sapere la polizia cantonale su Facebook.
Ma non si tratta di un inquinamento delle acque: la colorazione è dovuta alla presenza di un'alga rossa (Planktothrix rubescens), che "di solito si moltiplica a basse temperature in inverno" scrivono ancora le autorità, spiegando che a seconda della concentrazione può essere pericolosa per gli animali. La polizia invita pertanto i proprietari di cani a prestare attenzione ai loro animali.
Anche nel Ceresio è già stata segnalata, negli scorsi mesi, la presenza di cianobatteri (alghe azzurre). Un fenomeno che ha preoccupato, nell'estate del 2021, pure il lago di Zurigo.
Lago di Zurigo, problemi con l'alga azzurra
Telegiornale 20.08.2021, 22:00
Il perché del colore del lago
Il Quotidiano 23.06.2020, 21:30
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