Connectivity matrices around the Sekisei Lagoon for each year during the period 2012–2015. Numbers on the abscissa (source areas) and ordinate (destination areas) correspond to the groups shown in Fig. 2. High probability densities (warm colors) indicate that numerous particles drifted from the source area to the destination area. Red outlines show high-probability-density source areas outside of the lagoon (i.e., other than groups 3, 10, and 14–18) for Group 16.