Conceptual Diagram (IMAGE) Virginia Institute of Marine Science Caption Conceptual diagram using fish in ponds to illustrate how variability propagates from small to large scales. Labels show year-to-year changes in the abundance of three hypothetical fish species and in the total abundance among all species at each of three different ponds. The diagram shows that stable, healthy ecosystems--ones with little change though time as shown in green in the lower right-hand corner--result from high diversity in the number of species at the local scale (a single pond), together with little overlap among population changes in different ponds, which smooths out overall fluctuations in species populations at the regional scale. Credit © Dr. Chris Patrick/VIMS. Usage Restrictions One-time use only, and with appropriate credit and caption. 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.