Fig. 4

Average number (±SD) of crabs per trap collected after each flood and ebb tide throughout 48 h in Mar Chiquita in winter (a), spring (b), summer (c) and autumn (d). Crabs trapped in mudflat (MF), salt marsh (SM) and those collected moving from salt marsh to mudflat (SM > MF) and from mudflat to salt marsh (MF > SM) are shown. Tidal height is superimposed as a continuous line. Dotted shadow indicates tidal height covering the MF; waved shadow indicates tidal height covering the SM. Horizontal bars below each graph indicate periods of daylight (white) and darkness (black)