Jan A. van Gils, Bernard Spaans, Anne Dekinga, and Theunis Piersma. 2006. Foraging in a tidally structured environment by red knots (Calidris canutus): ideal, but not free. Ecology 87:1189–1202.

Appendix B. A figure showing availability of feeding sites as a function of tidal time and cycle type.

FIG. B1. Number of 4-km2 blocks available for feeding in the course of a tidal cycle, plotted for the five different types of cycles (indicated by w) that were applied in the models.