La prima diversificazione dei dinosauri avvenne in seguito a una crisi dell'ecosistema causata da un rapido riscaldamento globale. Lo indicano i fossili rinvenuti sulle Dolimiti, che giocano quindi un ruolo fondamentale per capire l'evoluzione di questi animali. Lo studio è stato pubblicato lunedì sulla rivista Nature Communications.
Questo sconvolgimento climatico, chiamato "Episodio pluviale del Carnico" avvenne circa 232 milioni di anni fa, nel periodo Triassico. "Siamo riusciti a dimostrare che i dinosauri, rari e distribuiti in modo puntiforme fino alla crisi, dopo di essa sono esplosi di numero e si sono diffusi in gran parte del mondo", ha spiegato uno dei ricercatori. "In nessun luogo del pianeta la crisi del Carnico è così ben documentata come nell'area dolomitica", ha aggiunto un altro scienziato. La ricerca ha insomma permesso agli studiosi di ricostruire nel dettaglio le risposte dei diversi ambienti e degli ecosistemi al cambiamento climatico, da qui la diversificazione dei dinosauri.
ATS/CaL
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