Oggi ho rintracciato gli Ibis che avevo visto qualche giorno fa dalle mie parti, nelle vicinanze di casa mia…
Li ho visti in mezzo ad un gruppo di almeno 30-40 Ardeidi, tra cui moltissime Garzette, Aironi cenerini ed Aironi bianchi maggiori…
Ho avuto anche un presentimento… Mi son visto tra vent’anni (se avrò la fortuna di arrivarci e se non sarà tutto case, palazzi e asfalto…), ripassare negli stessi luoghi ed essere bloccato alla vista di 30-40 Ibis e due o tre Aironi…
Se pensiamo alla deriva dei continenti, non come una teoria, ma come un dato di fatto ed allarghiamo il concetto alle conoscenze attuali, sappiamo che la crosta terrestre (diciamo le terre emerse per semplificare) continua a rimodellarsi, riciclarsi, le placche si allargano, si stringono e le terre emerse si allontanano ed avvicinano come un grande puzzle da alcune centinaia di milioni di anni.
Di conseguenza, non solo i climi sono cambiati ma anche la flora e la fauna sono cambiate. La distribuzione degli organismi sul nostro pianeta è sempre stata condizionata dalla distribuzione delle terre emerse e, soprattutto, dalle barriere geografiche tra un luogo e l’altro e dalla capacità degli organismi stessi di superare tali barriere.
Allora, l’apertura di un oceano e l’allontanamento di due placche, fa in modo che le specie presenti nel continente precedente, vengano separate e rese indipendenti con le ovvie conseguenze che conosciamo sull’evoluzione. Organismi isolati fanno da sè e si evolvono parallelamente in modi diversi o simili, ma mai uguali. L’apertura di un nuovo oceano però può anche originare una Leggi tutto “6000 anni per ‘costruire’ un ponte tra frammenti di crosta continentale!”
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