Le alte temperature delle acque degli ultimi giorni regalano sorprese a chi esplora i fondali. Marco Selvini si trovava a 7-8 metri di profondità in zona Paradiso, quando si è trovato di fronte alcune meduse. "Sono apparse improvvisamente. Sono cose che, anche se te le hanno raccontate, ti lasciano stupefatto quando accadono, perché mai ti aspetteresti una cosa del genere", racconta il sommozzatore.
Sono meduse di acqua dolce, biancastre e trasparenti, di due centimetri di diametro e soprattutto non pericolose. "I suoi tentacoli non sono urticanti e non pongono neanche problemi a livello di biodiversità", tranquillizza Alberto Conelli, biologo esperto di corsi d'acqua.
Non pongono problemi nemmeno alla biodiversità
Questi animali sono originari dell’Asia orientale e sono stati trasportati nelle acque ticinesi dall’uomo o dagli uccelli diversi anni fa. "Ci accorgiamo della loro presenza solo in estate, quando l’acqua supera i 25°", spiega il biologo. Si possono avvistare nel lago di Lugano, ma anche nel lago Maggiore.
Nel lago cozze e meduse
Il Quotidiano 14.08.2018, 21:30
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