The Great Lakes have long been host to invasive species introduced through human activities. They have also seen the ravages of over-fishing and the introduction of non-native species to fill the void. This has led to wild swings in aquatic ecosystems and populations, with the fisheries experiencing booms and busts that had similar effects on the local economies. Now, this succession of invasive waves seems to be leading to an unexpected outcome — the invaders look to be cancelling each other out, and native species appear to be on the rebound. Wisconsin’s Journal Sentinel has a fascinating and informative three-part series on this long, strange journey, starting here: