Built in the 1980s, the Balbina Dam is one of dozens of large dams across rivers in the Amazon Basin.
has shown these disconnected patches of forest are no longer able to support thriving ecosystems.
For rainforest ecologists like us, the new landscape was an astonishing living lab – a way to test theories of what happens when a forest and its many animals are increasingly restricted to smaller and smaller patches. Over the past decade or so, scientists from many different institutions have made huge efforts to investigate which species are vanishing and which are persisting in the Balbina reservoir. In this study, we were able to compile those efforts.
Meanwhile, smaller islands suffered. There, only more adaptable species like armadillos or rodent acouchis were able to survive for over three decades. These medium-sized animals can occupy relatively small areas. In contrast, bigger mammals such as tapirs and jaguars need more space, and might have vanished even from mid-size islands.
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