Alături de aceștia, mai avea rinoceri, girafe, zebre și alte animale exotice. Când imperiul lui Escobar s-a prăbușit în anii 90, marea majoritate a animalelor sale au fost duse la grădini zoologice, cu excepția a patru hipopotami.
S-au înmulțit
Între timp, aceștia ș-au înmulțit și au ajuns acum la 80 de exemplare, devenind o specie invazivă care afectează deja ecosistemul acvatic al Columbiei, scrie CNET, care citează jurnalul de specialitate Ecology.
Cercetătorii de la Universitatea California din San Diego și cei de la Universidad Pedagógica y Tecnológica de Colombia au petrecut doi ani studiind calitatea microbiomului din lacurile cu populații de hipopotami.
Hipopotamii sunt animale nocturne, care se hrănesc noaptea cu vegetație, în vreme ce ziua stau în apă.
Fecalele lor stimulează algele periculoase
Oamenii de știință au descoperit că vastele cantități de deșeuri pe care aceștia le excretă schimbă chimia lacurilor și nivelurile de oxigen.
Mai exact, fecalele de hipopotami ajung să fertilizeze alge periculoase și bacterii. Mai departe, acestea pot duce la fenomene precum mareea roșie, care poate cauza diverse boli în oameni și animale.
Hipopotamii sunt greu de prins. Numărul acestora este așteptat să crească puternic în următorii ani, ceea ce va duce la efecte și mai nocive asupra ecosistemelor locale, pe măsură ce aceștia vor interacționa tot mai mult cu animalele locale.
Vor ajunge câteva mii în 20 de ani
În următorii 20 de ani aceștia ar putea ajunge la mii de exemplare, spune Jonathan Shurin, profesor de științe biologice la Universitatea California din San Diego.
Până atunci trebuie decis ce se întâmplă cu aceste animale.
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