Scientists recently looked at what urban development is doing to streams in Portland and eight other U.S. cities. They found that urban development can mean trouble for invertebrate species.
That’s especially true in pristine waters running through forests. Development from expanding cities can make streams flow faster. It also changes habitat and increases pollution.
A study by the U.S. Geological Survey found that all that can kill insects like mayflies, stoneflies and caddisflies.