The environment varies in space and time. Different phytoplankton grow well under different conditions, so there is a seasonal succession in the plankton community.. Equal ?maxUnequal KsAt low N, Sp. 1 winsUnequal ?maxEqual KsAt high N, Sp. 2 winsUnequal ?maxUnequal KsAt low N, Sp. 1 winsAt high N, Sp. 2 wins.