Weak Warning Signals: GIF-Animation (IMAGE) University of Jyväskylä - Jyväskylän yliopisto Caption Weak warning signals can persist in the absence of gene flow. Credit JP Lawrence/University of Irwine California, USA Usage Restrictions None 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.