Large predatory fish are becoming rarer, while smaller species dominate. This has consequences for entire ecosystems. Researchers at iDiv Leipzig have analyzed data from almost 15,000 fish communities over decades. Their findings: food webs in oceans and rivers are changing worldwide, even where the number of species remains the same. Why this can pose a threat to bodies of water and what scientists are now calling for.
A sporty scientist campaigns for water protection. Andreas Fath swims more than 1000 kilometers across the Elbe. It is not his first experiment of this kind.
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