Figure 4

Historic Plankton group abundances (from CPR data) and sea surface temperature (from UK Meteorological Office). The three time periods are shown in different colours: Peach 1971–1980; Green 1981–1990, and Blue 1991–2000. The x-axis is the month of the year, and the y-axis shows the relative zooplankton abundance (scaled relative to each groups maximum) for each time period. This relative scaling is to enable clear comparisons of relative abundance between groups for each biogeographical zooplankton group over the three decades.