Urban pond (IMAGE) University of Helsinki Caption Emergent plants, such as sedges, can enhance the occurrence of diving beetles in a pond. Diving beetles are an indicator taxon of pond biodiversity. Credit Wenfei Liao Usage Restrictions Credit: Wenfei Liao License Original 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.