Abstract
Conservation history of horseshoe crab Tachypleus tridentatus and its spawning ground assigned as a natural monument in Kasaoka Bay in Okayama Prefecture was investigated. Large-scale land reclamation of this bay had begun since 1968, resulting in the disappearance of the ebb tidal flat. As a measure, a new habitat area of this animal was assigned as a natural monument as well as many other activities. However its population in Kasaoka came to be endangered. Lack of thinking of environmental capacities and physical factors might be critical. This history tells us the useful information to reconsider present and future environmental conservation activities.
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