Activity Cycles

The Activity Cycles of Uca formosensis

Fig. 28. Numerous chimneys of Uca formosensis protrude above the substrate when habitat has not been covered by tide and become extremely dry.

The vigorous courtship

Building the symbol of love — chimney

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Fig. 29. The burrow entrance of Uca formosensis is round-shaped.

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Fig. 30. The early stage of the chimney which is constructing by Uca formosensis.

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Fig. 31. A male Uca formosensis is building the chimney.

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Fig. 32. The middle stage of chimney construction of Uca formosensis is hood-shaped.

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Fig. 33. A typical chimney built by Uca formosensis.

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Fig. 34. An ovigerous female Uca formosensis is building the chimney.

Two different worlds inside and outside of the chimney

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Fig. 35. The surface becomes dry and cracked when the tides do not reach the habitat.

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Fig. 36. If the drought continues for several days, salt starts to crystallize from the seawater remained on the surface. The surface temperature will be high more than 40 ° C during this period.

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Fig. 37. The burrow depth of Uca formosensis reaches approximately one meter in the high intertidal zone.

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Fig. 38. The drought period comes to an end when the tide covers the habitat.

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