Urchin barren (IMAGE) University of California - Santa Cruz Caption Most of the kelp forest ecosystem in Northern California has been replaced by urchin barrens like this one in a popular dive spot. Credit Katie Sowul/CDFW) Usage Restrictions For use only with news stories about this research 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.