[O-08] Poster presentations by senior high school students

[O08-P18] Consideration on changes in foraminifera seen on the Sajima coast due to environmental changes

*Yuri Mizutani¹ (1.Yokohama Science Frontier High School)

Keywords:Foraminifera

Foraminifera, whose name comes from the fact that they have holes in their shells, are a type of protist, and there are many species around the world. Since the shell is calcareous, the shell remains in the sandy beach even after the foraminifera dies. White sand called star sand is also a type of foraminifera, and the foraminiferal shell has various shapes such as star-shaped and spiral-shaped. However, since little is known about the ecology of foraminifera, we decided to consider the ecology of foraminifera by comparing the carcasses of foraminifera contained in the collected sand with the environment. The sand collected on the Sajima coast in 2019 and 2021 was observed under a microscope, and changes were observed in the number and types of foraminifera contained in the sand. Since the number of foraminifera observed from the sand in 2021 was higher than that observed from the sand in 2019, it was considered that a large number of foraminifera died in two years. In addition, from the data of the Japan Meteorological Agency, it was found that the seawater temperature near the Sajima coast had risen in two years. From these facts, it is considered that the seawater temperature is greatly related to the ecology of foraminifera.