Don't mess with mother nature.
Built in the 1980s, the Balbina Dam is one of the dozens of large dams across rivers in the Amazon Basin. Such dams might leave behind seemingly green patches of forest, but ourhas shown these disconnected patches of forest are no longer able to support thriving ecosystems.
We know that one of the main drivers of the ongoing biodiversity crisis is the loss of habitat and the fragmentation of the remaining areas. And we know that hydroelectric dams are one of the primary ways humans are disturbing these habitats, and that many developing countries are due to build many more dams.
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. We also found widespread and non-random cases of species going extinct on individual islands. Bigger species were generally more likely to go extinct, but this varied across different groups of plants, vertebrates and invertebrates. For instance, the largest species of orchid beeswere also widely distributed across the landscapes. This was also the case for large understorey bird species, whereas the pattern was opposite for frogs, with the smallest species being more widely distributed.
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