When the tide recedes at low tide and the intertidal zone is exposed, large and small "ponds" appear in places where seawater is left behind in the hollows of the rocks. These are called tidal pools or tide pools. Tidepools also provide a unique living environment for organisms. Tide pools are always filled with seawater, but the environmental conditions are not stable. For example, during the hot summer months, the water temperature can reach nearly 40 degrees Celsius (although in Hokkaido it doesn't get that high...), and the water temperature can vary greatly throughout the day. Also, if there is a lot of rain, fresh water will flow in and the salinity will decrease, and if the weather is sunny, evaporation will increase the salinity. In this way, the tide pool seems to be a fairly harsh environment for living things, but there are also a wide variety of living things living there, so if you have the opportunity, please pay attention to such living things.
