Illustration A (IMAGE)

Umea University

Illustration A

Caption

Previous theories have assumed that water, sediment and plant seeds move freely downstream (top image). However, lakes and rapids can become natural barriers where water can be slowed down as well. The solid lines show high transport or dispersal, and the dotted lines show reduced transport due to natural barriers.

Credit

Marlene Lahti

Usage Restrictions

Free for publication in connection with reporting on this press release.

License

Licensed content

Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.