Displaying items by tag: are dams bad

A biologist with Conservation Fisheries surveys a stretch of Little River near Walland, Tennessee to determine fish viability and identify rare species for transplantation. Thomas Fraser/Hellbender Press

Human activities have imperiled our waterways — along with a third of freshwater fish and other aquatic species

This story was originally published by The Revelator.

If we needed more motivation to save our ailing rivers, it could come with the findings of a recent study that determined the biodiversity crisis is most acute in freshwater ecosystems, which thread the Southern landscape like crucial veins and arteries.

Rivers, lakes and inland wetlands cover 1 percent of the Earth but provide homes for 10 percent of all its species, including one-third of all vertebrates. And many of those species are imperiled — some 27 percent of the nearly 30,000 freshwater species so far assessed by the IUCN Red List. This includes nearly one-third of all freshwater fish.

How did things get so bad? For some species it’s a single action — like building a dam. But for most, it’s a confluence of factors — an accumulation of harm — that builds for years or decades.