Figure 2.

Network connections recorded for the standard run. Lines curve to the right in the direction of the connection and the line thickness shows the strength of the connection. Connections returning to source indicate larvae retained in the site. Site name abbreviations are given in table 1. The western (HB, NWRB, ERB and SERB) and northern (RBS, WTR, DM and FSSB) strongly connected clusters can be seen. Additional arrows and dashed lines show the modelled alterations to the network under positive (blue symbols) and negative (red symbols) NAO conditions. Large arrows indicate strengthened connections and small arrow weakened connections. Dashed lines show connections modelled to be lost. A small arrow and dashed line together shows a seriously weakened connection which would be lost with a larger swing to positive or negative NAO state.