Arctic Wolf Spider (IMAGE) Washington University in St. Louis Caption Wolf spiders are top predators in the tundra. They are becoming larger with the earlier snowmelt caused by Arctic warming, which could alter their predation effects on the ecosystem, according to new research from Washington University in St. Louis. Credit Kiki Contreras Usage Restrictions For editorial purposes 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.