Figure 4
From: Simple rules for construction of a geometric nest structure by pufferfish
Formation of radial ditches over time. (A–C) Snapshots of a simulation with the early-stage parameters (H = 0, b = 6, f = 10) when excavation was repeated (A) 100, (B) 400, and (C) 2000 times. Yellow circles represent areas where height was analyzed. (D) A snapshot of a simulation using the middle-stage parameters (H = 0, b = 6, f = 10). One scale of simulation was estimated as 1.1 cm. Excavation was repeated 2000 times. (E,F) Rectified photos of (E) the early and (F) the middle stage at the end of the analysis in Fig. 1C,D. (G) Height over the middle part in the outer ring region through the repeat of excavation in the simulation (A–C). (H) Inversed image intensity (high values represent darker sites) of the middle part in the early- and the middle-stage outer ring region from the photo images (E,F). It should be noted that this intensity does not correctly represent relative heights of the nests (they are biased by many factors such as the location of the camera and the direction of sunlight).
